Network Working Group M. Fine
Internet Draft K. McCloghrie
Expires September 2001 Cisco Systems
J. Seligson
K. Chan
Nortel Networks
S. Hahn
C. Bell
Intel
A. Smith
Allegro Networks
Francis Reichmeyer
PFN
March 2, 2001
Differentiated Services Quality of Service Policy Information Base
draft-ietf-diffserv-pib-03.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC2026. Internet-Drafts are working
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or to cite them other than as ``work in progress.''
DiffServ QoS Policy Information Base February 2001
To view the current status of any Internet-Draft, please check the
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1. Glossary
PRC Provisioning Class. A type of policy data.
PRI Provisioning Instance. An instance of a PRC.
PIB Policy Information Base. The database of policy information.
PDP Policy Decision Point. See [RAP-FRAMEWORK].
PEP Policy Enforcement Point. See [RAP-FRAMEWORK].
PRID Provisioning Instance Identifier. Uniquely identifies an
instance of a a PRC.
2. Introduction
[SPPI] describes a structure for specifying policy information that can
then be transmitted to a network device for the purpose of configuring
policy at that device. The model underlying this structure is one of
well defined policy rule classes and instances of these classes residing
in a virtual information store called the Policy Information Base (PIB).
This document specifies a set of policy rule classes specifically for
configuring QoS Policy for Differentiated Services [DSARCH].
One way to provision policy is by means of the COPS protocol [COPS] with
the extensions for provisioning [COPS-PR]. This protocol supports
multiple clients, each of which may provision policy for a specific
policy domain such as QoS. The PRCs defined in this DiffServ QoS PIB
are intended for use by the COPS-PR QoS client type. Furthemore, these
PRCs are in addition to any other PIBs that may be defined for the QoS
client type in the future, as well as the PRCs defined in the Framework
PIB [FR-PIB].
3. Relationship to the Diffserv Informal Management Model
This PIB is designed according to the Differentiated Services Informal
Management Model documented in [MODEL]. The model describes the way that
ingress and egress interfaces of an 'n'-port router are modelled. It
describes the configuration and management of a Diffserv interface in
terms of a Transmission Control Block (TCB) which contains, by
definition, zero or more classifiers, meters, actions, algorithmic
droppers, queues and schedulers. These elements are arranged according
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to the QoS policy being expressed, always in that order. Traffic may be
classified; classified traffic may be metered; each stream of traffic
identified by a combination of classifiers and meters may have some set
of actions performed on it; it may have dropping algorithms applied and
it may ultimately be stored into a queue before being scheduled out to
its next destination, either onto a link or to another TCB. When the
treatment for a given packet must have any of those elements repeated in
a way that breaks the permitted sequence {classifier, meter, action,
algorithmic dropper, queue, scheduler}, this must be modelled by
cascading multiple TCBs.
The PIB represents this cascade by following the "Next" attributes of
the various elements. They indicate what the next step in Diffserv
processing will be, whether it be a classifier, meter, action,
algorithmic dropper, queue, scheduler or a decision to now forward a
packet.
The PIB models the individual elements that make up the TCBs. The
higher level concept of a TCB is not required in the parameterization or
in the linking together of the individual elements, hence it is not used
in the PIB itself and only mentioned in the text for relating the PIB
with the [MODEL]. The actual distinguishing of which TCB a specific
element is a part of is not needed for the instructmentation of a device
to support the functionalities of DiffServ, but it is useful for
conceptual reasons. By not using the TCB concept, this PIB allow any ]
grouping of elements to construct TCBs, using rules indicated by the
[MODEL]. This will minimize changes to this PIB if rules in [MODEL]
change.
The notion of a Data Path is used in this PIB to indicate the DiffServ
processing a packet may experience. This Data Path is distinguished
based on the Role Combination and the Direction of the flow the packet
is part of. A Data Path Table Entry indicates the first of possibly
multiple elements that will apply DiffServ treatment to the packet.
3.1. PIB Overview
This PIB is structured based on the need to configure the sequential
DiffServ treatments being applied to a packet, and the parameterization
of these treatments. These two aspects of the configuration are kept
separate throughout the design of the PIB, and are fulfilled using
separate tables and data definitions.
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In addition, the PIB includes tables describing the capabilities and
limitations of the device using a general extensible framework. These
tables are reported to the PDP and assist the PDP with the configuration
of functional elements that can be realized by the device.
In this PIB, the ingress and egress portions of a router are configured
independently but in the same manner. The difference is distinguished by
an attribute in a table describing the start of the data path. Each
interface performs some or all of the following high-level functions:
o Classify each packet according to some set of rules
o Determine whether the data stream the packet is part of is within
or outside its rate
o Perform a set of resulting actions such as application of an
appropriate drop policy and marking of the traffic with a
Differentiated Services Code Point (DSCP) as defined in [DSFIELD].
o Enqueue the traffic for output in the appropriate queue, whose
scheduler may shape the traffic or simply forward it with some
minimum rate or maximum latency.
The PIB therefore contains the following elements:
Data Path Table
This describes the starting point of DiffServ data paths within a
single DiffServ device. This table descibes interface role
combination
and interface direction specific data paths.
Classifier Tables
A general extensible framework for specifying a group of filters.
Meter Tables
A general extensible framework and one example of a
parameterization table - TBParam table, applicable for Simple Token
Bucket Meter, Average Rate Meter, Single Rate Three Color Meter,
Two Rate Three Color Meter, and Sliding Window Three Color Meter.
Action Tables
A general extensible framework and examples of parameterization
tables for Absolute Drop, Mark and Count actions. The
"multiplexer" and "null" actions described in [MODEL] are
accomplished implicitly by means of the Prid structures
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of the other elements.
Queue, Scheduler and Algorithmic Dropper Tables
A general extensible framework for parameterizing queuing and
scheduler systems. The queue measurement dependent algorithmic
droppers are also described here.
Capabilities Tables
A general extensible framework for defining the capabilities and
limitations of the elements listed above. The capability tables
allow intelligent configuration of the elements by a PDP.
4. Structure of the PIB
4.1. General Conventions
The PIB consists of classes that represent functional elements in the
data path (e.g. classifiers, meters, actions), and classes that specify
parameters that apply to a certain type of functional element (e.g. a
Token Bucket meter or a Mark action). Parameters are typically
specified in a separate PRC to enable the use of parameter classes by
multiple policies.
Functional element PRC's use the Prid TC (defined in [SPPI]) to indicate
indirection. A Prid is a object identifier that is used to specify an
instance of a PRC in another table. A Prid is used to point to
parameter PRC that applies to a functional element, such as which filter
should be used for a classifier element. A Prid is also used to
specify an instance of a functional element PRC that describes what
treatment should be applied next for a packet in the data path.
Note that the use of Prid's to specify parameter PRC's allows the same
funtional element PRC to be extended with a number of different types of
parameter PRC's. In addition, using Prids to indicate the next
functional datapath element allows the elements to be ordered in any
way.
4.2. DiffServ Data Paths
This part of the PIB provides instrumentation for connecting the
DiffServ Functional Elements within a single DiffServ device. Please
refer to the [MODEL] for discussions on the valid sequencing and
grouping of DiffServ Functional Elements. Given some basic information,
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e.g. the interface role combination and direction, the first DiffServ
Functional Element is determined. Subsequent DiffServ Functional
Elements are provided by the "Next" pointer attribute of each entry of
data path tables. A description of how this "Next" pointer is used in
each table is provided in their respective DESCRIPTION clauses.
4.2.1. Data Path PRC
The Data Path PRC provides the DiffServ treatment starting points for
all packets of this DiffServ device. Each instance of this PRC specifies
the interface type, role combination and direction for the packet flow.
There should be at most two entries for each (interface type, role
combination) pair, one for ingress and one for egress. Each instance
provides the first DiffServ Functional Element each packet at a specific
interface (identified by the roles assigned to the interface) traveling
in a specific relative direction should experience. Notice this table
is interface specific, with the use of interface type and
RoleCombination. To indicate explicitly that there are no Diffserv
treatments for a particular interface type, role combination and
direction, an instance of the Data Path PRC can be created with
zeroDotZero in the qosDataPathStart attribute. This situation can also
be indicated implicitly by not supplying an instance of a Data Path PRC
for that particular interface type, role combination and direction. The
explicit/implicit selection is up to the implementation. This means
that the PEP should perform normal IP device processing when zeroDotZero
is used in the qosDataPathStart attribute, or when the entry does not
exist. Normal IP device processing will depend on the device, for
example, this can be forwarding the packet.
4.3. Classifiers
The classifier and classifier element tables determine how traffic is
sorted out. They identify separable classes of traffic, by reference to
appropriate filters, which may select anything from an individual micro-
flow to aggregates identified by DSCP.
The classification is used to send these separate streams to appropriate
Meter, Action, Algorithmic Dropper, Queue and Scheduler elements. For
example, to indicate a multi-stage meter, sub-classes of traffic may be
sent to different meter stages: e.g. in an implementation of the Assured
Forwarding (AF) PHB [AF-PHB], AF11 traffic might be sent to the first
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meter, AF12 traffic might be sent to the second and AF13 traffic sent to
the second meter stage's out-of-profile action.
The concept of a classifier is the same as described in [MODEL]. The
structure of the classifier and classifier element tables, is the same
as the classifier described in [MODEL]. Classifier elements have an
associated precedence order solely for the purpose of resolving
ambiguity between overlapping filters. Filter with higher values of
order are compared first; the order of tests for entries of the same
precedence is unimportant.
A datapath may consist of more than one classifier. There may be
overlap of filter specification between filters of different
classifiers. The first classifier functional datapath element
encountered, as determined by the sequencing of diffserv functional
datapath elements, will be used first.
An important form of classifier is "everything else": the final stage of
the classifier i.e. the one with the lowest precedence, must be
"complete" since the result of an incomplete classifier is not
necessarily deterministic - see [MODEL] section 4.1.2.
The definition of the actual filter to be used by the classifier is
referenced via a Prid: this enables the use of any sort of filter table
that one might wish to design, standard or proprietary. No filters are
defined in this PIB. However, standard filters for IP packets are
defined in the Framework PIB [FR-PIB].
4.3.1. Classifier PRC
Classifiers, used in various ingress and egress interfaces, are
organized by the instances of the Classifier PRC. A data path entry
points to a classifier entry. A classifier entry identifies a list of
classifier elements. A classifier element effectively includes the
filter entry, and points to a "next" classifier entry or other data path
functional element.
4.3.2. Classifier Element PRC
Classifier elements point to the filters which identify various classes
of traffic. The separation between the "classifier element" and the
"filter" allows us to use many different kinds of filters with the same
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essential semantics of "an identified set of traffic". The traffic
matching the filter corresponding to a classifier element is given to
the "next" data path functional element identified in the classifier
element.
The definition of the actual filter to be used by the classifier is
referenced via a Prid: this enables the use of any sort of filter table
that one might wish to design, standard or proprietary. An example of a
filter that may be pointed to by a Classifier Element PRI is the
frwkIpFilter PRC, defined in [FR-PIB].
4.4. Meters
A meter, according to [MODEL] section 5, measures the rate at which
packets making up a stream of traffic pass it, compares this rate to
some set of thresholds and produces some number (two or more) of
potential results. A given packet is said to "conform" to the meter if,
at the time that the packet is being looked at, the stream appears to be
within the meter's profile. PIB syntax makes it easiest to define this
as a sequence of one or more cascaded pass/fail tests, modeled here as
if-then-else constructs. It is important to understand that this way of
modelling does not imply anything about the implementation being
"sequential": multi-rate/multi-profile meters e.g. those designed to
support [SRTCM], [TRTCM], or [TSWTCM] can still be modeled this way even
if they, of necessity, share information between the stages: the stages
are introduced merely as a notational convenience in order to simplify
the PIB structure.
4.4.1. Meter PRC
The generic meter PRC is used as a base for all more specific forms of
meter. The definition of parameters specific to the type of meter used
is referenced via a pointer to an instance of a PRC containing those
specifics. This enables the use of any sort of specific meter table
that one might wish to design, standard or proprietary. The specific
meter table may be, but does not need to be, defined in this PIB module.
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4.4.2. Token-Bucket Parameter PRC
This is included as an example of a common type of meter. Entries in
this table are referenced from the qosMeterSpecific attributes of meter
PRC instances. The parameters are represented by a rate qosTBParamRate,
a burst size qosTBParamBurstSize, and an interval qosTBparamInterval.
The type of meter being parameterized is indicated by the qosTBParamType
attribute. This is used to determine how the rate, burst and rate
interval parameters are used. Additional meter parameterization classes
can be defined in this or another PIB when necessary.
4.5. Actions
Actions include "no action", "mark the traffic with a DSCP" or "drop the
traffic". Other tasks such as "shape the traffic" or "drop based on some
algorithm" are handled elsewhere as queueing mechanisms, rather than
actions, consistent with [MODEL]. The "multiplexer", "replicator" and
"null" actions described in [MODEL] are accomplished implicitly through
various combinations of the other elements.
This PIB uses the Action PRC qosActionTable to organize one Action's
relationship with the element(s) before and after it. It allows Actions
to be cascaded to enable multiple Actions be applied to a single traffic
stream by using each entry's qosActionNext attribute. The qosActionNext
attribute of the last action entry in the chain points to the next
element in the TCB, if any, e.g. a Queueing element. It may also point
at a next TCB.
The parameters needed for the Action element will depend on the type of
Action to be taken. Hence the PIB allows for specific Action Tables for
the different Action types. This flexibility allows additional Actions
be specified in future revisions of this PIB, or in other PIBs and also
allows for the use of proprietary Actions without impact on those
defined here.
There is one action - the absolute drop action - that does not require
additional parameters. This action silently discards all traffic
presented to it. To accommodate this action, the qosAction PRC contains
an attribute, qosActionType, that indicates whether the absolute drop
action is to be used or if the action is described by a specific action
table.
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4.5.1. DSCP Mark Action PRC
This Action is applied to traffic in order to mark it with a Diffserv
Codepoint (DSCP) value, specified in the qosDscpMarkActTable. Other
marking actions might be specified elsewhere - these are outside the
scope of this PIB.
4.5.2. Absolute Drop Action
This action just silently discards all traffic presented to it. This
action has no additional parameters and so is represented only within
qosActionType without its specific table.
4.6. Queueing Elements
These include Algorithmic Droppers, Queues and Schedulers which are all
inter-related in their use of queueing techniques.
4.6.1. Algorithmic Dropper PRC
Algorithmic Droppers are represented in this PIB by instances of the
Algorithmic Dropper PRC. An Algorithmic Dropper is assumed to operate
indiscriminately on all packets that are presented at its input, all
traffic separation should be done by classifiers and meters preceding
it.
Algorithmic Droppers have a close relationship with queuing, each
Algorithmic Dropper Table entry contains a qosAlgDropQMeasure attribute,
indicating which queue's state affects the calculation of the
Algorithmic Dropper. Each entry also contains a qosAlgDropNext
attribute which indicates to which queue the Algorithmic Dropper sinks
its traffic.
Algorithmic Droppers may also contain a pointer to specific detail of
the drop algorithm, qosAlgDropSpecific. This PIB defines the detail for
three drop algorithms: Tail Drop, Head Drop and Random Drop; other
algorithms are outside the scope of this PIB module but the general
framework is intended to allow for their inclusion via other PIB
modules.
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One generally-applicable parameter of a dropper is the specification of
a queue-depth threshold at which some drop action is to start. This is
represented in this PIB, as a base attribute, qosAlgDropQThreshold, of
the Algorithmic Dropper entry. The attribute, qosAlgDropQMeasure,
specifies which queue's depth qosAlgDropQThreshold is to compare
against.
o A Tail Dropper requires the specification of a maximum queue depth
threshold: when the queue pointed at by qosAlgDropQMeasure
reaches that depth threshold, qosAlgDropQThresh, any new
traffic arriving at the dropper is discarded. This algorithm uses
only parameters that are part of the qosAlgDropEntry.
o A Head Dropper requires the specification of a maximum queue depth
threshold: when the queue pointed at by qosAlgDropQMeasure
reaches that depth threshold, qosAlgDropQThresh, traffic
currently at the head of the queue is discarded. This algorithm
uses only parameters that are part of the qosAlgDropEntry.
o Random Droppers are recommended as a way to control congestion, in
[QUEUEMGMT] and called for in the [AF-PHB]. Various implementations
exist, which agree on marking or dropping just enough traffic to
communicate with TCP-like protocols about congestion avoidance, but
differ markedly on their specific parameters. This PIB attempts to
offer a minimal set of controls for any random dropper, but expects
that vendors will augment the PRC with additional controls and
status in accordance with their implementation. This algorithm
requires additional parameters on top of those in
qosAlgDropEntry; these are discussed below.
4.6.2. Random Dropper PRC
One example of a random dropper is a RED-like dropper. An example of the
representation chosen in this PIB for this element is shown in Figure 1.
Random droppers often have their drop probability function described as
a plot of drop probability (P) against averaged queue length (Q).
(Qmin,Pmin) then defines the start of the characteristic plot. Normally
Pmin=0, meaning with average queue length below Qmin, there will be no
drops. (Qmax,Pmax) defines a "knee" on the plot, after which point the
drop probability become more progressive (greater slope). (Qclip,1)
defines the queue length at which all packets will be dropped. Notice
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this is different from Tail Drop because this uses an averaged queue
length. Although it is possible for Qclip = Qmax.
In the PIB module, qosRandomDropMinThreshBytes and
qosRandomDropMinThreshPkts represent Qmin. qosRandomDropMaxThreshBytes
and qosRandomDropMaxThreshPkts represent Qmax. qosAlgDropQThreshold
represents Qclip. qosRandomDropProbMax represents Pmax. This PIB does
not represent Pmin (assumed to be zero unless otherwise represented).
In addition, since message memory is finite, queues generally have some
upper bound above which they are incapable of storing additional
traffic. Normally this number is equal to Qclip, specified by
qosAlgDropQThreshold.
Each random dropper specification is associated with a queue. This
allows multiple drop processes (of same or different types) to be
associated with the same queue, as different PHB implementations may
require. This also allows for sequences of multiple droppers if
necessary.
AlgDrop Queue
+-----------------+ +-------+
--->| Next ---------+--+------------------->| Next -+--> ...
| QMeasure -------+--+ | ... |
| QThreshold | RandomDrop +-------+
| Type=randomDrop | +----------------+
| Specific -------+---->| MinThreshBytes |
+-----------------+ | MaxThreshBytes |
| ProbMax |
| InvWeight |
| SamplingRate |
+----------------+
Figure 1: Example Use of the RandomDropTable for Random Droppers
The calculation of a smoothed queue length may also have an important
bearing on the behavior of the dropper: parameters may include the
sampling interval or rate, and the weight of each sample. The
performance may be very sensitive to the values of these parameters and
a wide range of possible values may be required due to a wide range of
link speeds. Most algorithms include a sample weight, represented here
by qosRandomDropInvWeight. The availability of
qosRandomDropSamplingRate as readable is important, the information
provided by Sampling Rate is essential to the configuration of
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qosRandomDropInvWeight. Having Sampling Rate be configurable is also
helpful, as line speed increases, the ability to have queue sampling be
less frequent than packet arrival is needed. Note however that there is
ongoing research on this topic, see e.g. [ACTQMGMT] and [AQMROUTER].
Additional parameters may be added in an enterprise PIB module, e.g. by
using AUGMENTS on this table, to handle aspects of random drop
algorithms that are not standardized here.
NOTE: Deterministic Droppers can be viewed as a special case of Random
Droppers with the drop probability restricted to 0 and 1. Hence
Deterministic Droppers might be described by a Random Dropper with Pmin
= 0, Pmax = 1, Qmin = Qmax = Qclip, the averaged queue length at which
dropping occurs.
4.6.3. Queues and Schedulers
The Queue PRC models simple FIFO queues, as described in [MODEL] section
7.1.1. The Scheduler PRC allows flexibility in constructing both simple
and somewhat more complex queueing hierarchies from those queues. Of
course, since TCBs can be cascaded multiple times on an interface, even
more complex hierarchies can be constructed that way also.
Queue PRC instances are pointed at by the "next" attributes of the
upstream elements e.g. qosMeterSucceedNext. Note that multiple upstream
elements may direct their traffic to the same Queue PRI. For example,
the Assured Forwarding PHB suggests that all traffic marked AF11, AF12
or AF13 be placed in the same queue, after metering, without reordering.
This would be represented by having the qosMeterSucceedNext of each
upstream meter point at the same Queue PRI.
NOTE: Queue and Scheduler PRIs are for data path description, they both
use Scheduler Parameterization Table entries for diffserv treatment
parameterization.
Queue Table entries specify the scheduler it wants service from by use
of its Next pointer.
Each Scheduler Table entry represents the algorithm in use for servicing
the one or more queues that feed it. The [MODEL] section 7.1.2 describes
a scheduler with multiple inputs: this is represented in the PIB by
having the scheduling parameters be associated with each input. In this
way, sets of Queues can be grouped together as inputs to the same
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Scheduler. This table serves to represent the example scheduler
described in the [MODEL]: other more complex representations might be
created outside of this PIB.
Both the Queue PRC and the Scheduler PRC use instances of the Scheduler
Parameterization PRC to specify diffserv treatment parameterization.
Scheduler Parameter PRC instances are used to parameterize each input
that feeds into a scheduler. The inputs can be a mixture of Queue PRI's
and Scheduler PRI's. Scheduler Parameter PRI's can be used/reused by
one or more Queue and/or Scheduler Table entries.
For representing a Strict Priority scheduler, each scheduler input is
assigned a priority with respect to all the other inputs feeding the
same scheduler, with default values for the other parameters. A higher-
priority input which contains traffic that is not being delayed for
shaping will be serviced before a lower-priority input.
For Weighted Queuing methods e.g. WFQ, WRR, the "weight" of a given
scheduler input is represented with a Minimum Service Rate leaky-bucket
profile which provides guaranteed minimum bandwidth to that input, if
required. This is represented by a rate qosAssuredRateAbs; the
classical weight is the ratio between that rate and the interface speed,
or perhaps the ratio between that rate and the sum of the configured
rates for classes. The rate may, alternatively, be represented by a
relative value, as a fraction of the interface's current line rate,
qosAssuredRateRel to assist in cases where line rates are variable or
where a higher-level policy might be expressed in terms of fractions of
network resources. The two rate parameters are inter-related and
changes in one may be reflected in the other.
For weighted scheduling methods, one can say loosely, that WRR focuses
on meeting bandwidth sharing, without concern for relative delay amongst
the queues; where WFQ control both queue service order and amount of
traffic serviced, providing meeting bandwidth sharing and relative delay
ordering amongst the queues.
A queue or scheduled set of queues (which is an input to a scheduler)
may also be capable of acting as a non-work-conserving [MODEL] traffic
shaper: this is done by defining a Maximum Service Rate leaky-bucket
profile in order to limit the scheduler bandwidth available to that
input. This is represented by a rate qosShapingRateAbs; the classical
weight is the ratio between that rate and the interface speed, or
perhaps the ratio between that rate and the sum of the configured rates
for classes. The rate may, alternatively, be represented by a relative
value, as a fraction of the interface's current line rate,
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qosShapingRateRel. There was discussion in the working group about
alternative modeling approaches, such as defining a shaping action or a
shaping element. We did not take this approach because shaping is in
fact something a scheduler does to its inputs, (which we model as a
queue with a maximum rate or a scheduler whose output has a maximum
rate) and we felt it was simpler and more elegant to simply describe it
in that context.
Other types of priority and weighted scheduling methods can be defined
using existing parameters in qosAssuredRateEntry. NOTE:
qosSchedulerMethod uses OBJECT IDENTIFIER syntax, with the different
types of scheduling methods defined as OBJECT-IDENTITY. Future
scheduling methods may be defined in other MIBs. This requires an
OBJECT-IDENTITY definition, a description of how the existing objects
are reused, if they are, and any new objects they require.
NOTE: hierarchical schedulers can be parameterized using this PIB by
having Scheduler Table entries feeds into Scheduler Table entry.
4.7. Specifying Device Capabilities
The Diffserv PIB uses the Base PRC classes frwkPrcSupportTable and
frwkCompLimitsTable defined in [FR-PIB] to specify what PRC's are
supported by a PEP and to specify any limitations on that support. The
PIB also uses the capability PRC's frwkIfCapSetTable and
frwkIfCapSetRoleComboTable defined in [FR-PIB] to specify the device's
interface types and role combinations. Each instance of the capability
PRC frwkIfCapSetTable contains an OID that points to an instance of a
PRC that describes some capability of that interface type. The Diffserv
PIB defines several of these capability PRCs, which assist the PDP with
the configuration of Diffserv functional elements that can be
implemented by the device. Each of these capability PRCs contains a
direction attribute that specifies the direction for which the
capability applies. This attribute is defined in a base capability PRC,
which is extended by each specific capability PRC.
Classification capabilities, which specify the information elements the
device can use to classify traffic, are reported using the
qosIfClassificationCaps PRC. Metering capabilities, which indicate what
the device can do with out-of-profile packets, are specified using the
qosIfMeteringCaps PRC. Scheduling capabilities, such as the number of
inputs supported, are reported using the qosIfSchedulingCaps PRC.
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Algorithmic drop capabilities, such as the types of algorithms
supported, are reported using the qosIfAlgDropCaps PRC. Queue
capabilities, such as the maximum number of queues, are reported using
the qosIfQueueCaps PRC. Shaper capabilities, such as the number of
rates supported, are reported using the qosIfShaperCaps table.
Two PRC's are defined to allow specification of the element linkage
capabilities of the PEP. The qosIfElmDepthCaps PRC indicates the
maximum number of functional datapath elements that can be linked
consecutively in a datapath. The qosIfElmLinkCaps PRC indicates what
functional datapath elements are may follow a specific type of element
in a datapath.
The capability reporting classes in the DiffServ and Framework PIB are
meant to allow the PEP to indicate some general guidelines about what
the device can do. They are intended to be an aid to the PDP when it
constructs policy for the PEP. These classes do not necessarily allow
the PEP to indicate every possible configuration that it can or cannot
support. If a PEP receives a policy that it cannot implement, it must
notify the PDP with a failure report.
5. PIB Usage Example
This section provides some examples on how the different table entries
of this PIB may be used together for a Diffserv Device, with the usage
of each individual attribute be defined within the PIB module itself.
For the figures, all the PIB table entry and attribute names are assumed
to have "qos" as their first common initial part of name, with the table
entry name assumed to be their second common initial part of name.
"0.0" is being used to mean zeroDotZero. And for Scheduler Method "= X"
means "using the OID of qoxSchedulerX".
5.1. Model's Example
As an example, when this PIB's structures are used for the hypothetical
configuration in [MODEL] section 8.1, the result is shown in Figure 2,
3, and 4. The parameterization table entries' values are not specified
in detail here, they can be obtained from [MODEL] section 8.1.
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+---------------------+ +------------------------> Q_EF
|DataPath | |
| IfCapSet="If1" | |
| Roles = "A+B" | | +--------------+
| IfDirection=Ingress | +------+ | +--->|Action |
| Start --------------+--->|Clfr | | | | Id=EF2 |
+---------------------+ | Id=1 | | | | Next=0.0 |
+------+ | | | Specific=0.0 |
| | | Type=AbsDrop |
| | +--------------+
| |
| |
| |
+------------+ +--------------+ | |
|ClfrElement | +-->|Meter | | |
| Id=EF | | | Id=EF | | |
| ClfrId=1 | | | SucceedNext -+-+ |
| Order=NA | | | FailNext ----+----+
| Next ------+--+ | Specific -+ |
| Specific --+-+ +-----------+--+
+------------+ | |
| |
| |
| +--------+ | +---------+
+-->|FilterEF| +-->|TBMeterEF|
+--------+ +---------+
+------------+ +--------------+
|ClfrElement | +-------------------->|AlgDrop |
| Id=AF11 | | | Id=AF11 |
| ClfrId=1 | | | Type=tailDrop|
| Order=NA | | | Next --------+--+-> Q_AF1
| Next ------+--+ | QMeasure ----+--+
| Specific --+-+ | QThreshold |
+------------+ | | Specific=0.0 |
| +--------------+
|
| +----------+
+->|FilterAF11|
+----------+
Figure 2: Example from Model Section 8.1 part 1
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+------------+ +--------------+
|ClfrElement | +-->|Meter |
| Id=AF21 | | | Id=AF21 |
| ClfrId=1 | | | SucceedNext -+----------> Q_AF2
| Order=NA | | | FailNext + |
| Next ------+--+ | Specific --+ |
| Specific --+-+ +----------+-+-+
+------------+ | | |
| | |
| | |
| +----------+ | | +-----------+
+->|FilterAF21| | +->|TBMeterAF21|
+----------+ | +-----------+
|
-----+
|
| +-----------+
+->|Action |
| Id=AF21F2 |
| Next -----+------> Q_AF2
| Specific -+-+
| Type=Spcf | |
+-----------+ |
|
| +---------------+
+->|DscpMarkActAF22|
+---------------+
+------------+
|ClfrElement | +-----------------------------------------> Q_BE
| Id=WildCard| |
| ClfrId=1 | |
| Order=NA | |
| Next ------+--+ +--------------+
| Specific --+------>|FilterMatchAll|
+------------+ +--------------+
Figure 3: Example from Model Section 8.1 part 2
+-------------+
Q_EF--->|Q |
| Id=EF +--+--------------------------+
| Next ----+ | +-----------+ |
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| SchdParam --+-->|SchdParamEF| |
+-------------+ +-----------+ |
|
+-------------+ | +----------------+
Q_AF1-->|Q | +->|Scheduler |
| Id=AF1 +--+--------------------------+ | Id=Diffserv |
| Next ----+ | +------------+ | | Next=0.0 |
| SchdParam --+-->|SchdParamAF1| | | Method=Priority|
+-------------+ +------------+ | | SchdParam=0.0 |
| +----------------+
+-------------+ |
Q_AF2-->|Q | |
| Id=AF2 +--+--------------------------+
| Next ----+ | +------------+ |
| SchdParam --+-->|SchdParamAF2| |
+-------------+ +------------+ |
|
+-------------+ |
Q_BE--->|Q | |
| Id=BE +--+--------------------------+
| Next ----+ | +-----------+
| SchdParam --+-->|SchdParamBE|
+-------------+ +-----------+
Figure 4: Example from Model Section 8.1 part 3
5.2. Additional Data Path Example
5.2.1. Data Path and Classifier Example Discussion
The example in Figure 5 shows a single qosDataPathTable entry feeding
into a single Classifier entry, with three Classifier Element and Filter
Table entry pairs belonging to this Classifier 1. Notice the three
Filters used here must completely classify all the traffic presented to
this data path.
Another level of classification can be defined that follows the Action
functional DataPath elements in Figure 5. This multi-level
classification allow the construction of traffic separations and
specific actions at each level, like:
if (dept1) then take dept1-action
{
if (appl1) then take dept1-appl1-action.
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if (appl2) then take dept1-appl2-action.
if (appl3) then take dept1-appl3-action.
}
if (dept2) then take dept2-action
{
if (appl1) then take dept2-appl1-action.
if (appl2) then take dept2-appl2-action.
if (appl3) then take dept2-appl3-action.
}
if (dept3) then take dept3-action
{
if (appl1) then take dept3-appl1-action.
if (appl2) then take dept3-appl2-action.
if (appl3) then take dept3-appl3-action.
}
Minimally, the filters for appl1, appl2, appl3 may be reused for the
above setup.
+---------------------+
|DataPath |
| IfCapSet="If1" |
| Roles="A+B" |
| IfDirection=Ingress | +------+
| Start --------------+--->|Clfr |
+---------------------+ | Id=1 |
+------+
+------------+ +--------------+
|ClfrElement | +-->|Meter |
| Id=101 | | | Id=101 |
| ClfrId=1 | | | SucceedNext -+--->...
| Order=NA | | | FailNext ----+--->...
| Next ------+--+ | Specific -+ |
| Specific --+-+ +-----------+--+
+------------+ | |
| +-------+ | +--------+
+-->|Filter1| +-->|TBMeter1|
+-------+ +--------+
+------------+ +--------------+
|ClfrElement | +-->|Meter |
| Id=102 | | | Id=102 |
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| ClfrId=1 | | | SucceedNext -+->...
| Order=NA | | | FailNext ----+->...
| Next ------+--+ | Specific -+ |
| Specific --+-+ +-----------+--+
+------------+ | |
| +-------+ | +--------+
+-->|Filter2| +-->|TBMeter2|
+-------+ +--------+
+------------+ +--------------+
|ClfrElement | +-->|Meter |
| Id=103 | | | Id=103 |
| ClfrId=1 | | | SucceedNext -+->...
| Order=NA | | | FailNext ----+->...
| Next ------+--+ | Specific -+ |
| Specific --+-+ +-----------+--+
+------------+ | |
| +-------+ | +--------+
+-->|Filter3| +-->|TBMeter3|
+-------+ +--------+
Figure 5: Additional Data Path Example Part 1
+-------------+ +-----------------+
---->|Q | +->|Scheduler |
| Id=EF | | | Id=Diffserv |
| Next -------+-----------------------+ | Next=0.0 |
| SchdParam -+| | | Method=Priority |
+------------++ | | SchdParam=0.0 |
| | +-----------------+
+------------+ |
| |
| +-----------+ |
+->|SchdParamEF| |
+-----------+ +---------------------+
|
+----------------+ +-------------+ |
--->|AlgDrop | +->|Q | |
| Id=AF11 | | | Id=AF1 | +-------------+ |
| Type=randomDrop| | | Next -------+--->|Scheduler | |
| Next ----------+-+--+ | SchdParam -+| | Id=AF | |
| QMeasure ------+-+ | +------------++ | Next -------+--+
| QThreshold | | | | Method=WFQ |
| Specific -+ | | +------------+ | SchdParam --+--+
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+-----------+----+ | | +-------------+ |
| | | +------------+ |
+-----------+ | +->|SchdParamAF1| +----------------+
| +--------------+ | +------------+ |
+->|RandomDropAF11| | | +-----------+
+--------------+ | +->|SchdParamAF|
| +-----------+
+----------------+ |
--->|AlgDrop | |
| Id=AF12 | |
| Type=randomDrop| |
| Next ----------+-+--+
| QMeasure ------+-+
| QThreshold |
| Specific -+ |
+-----------+----+
|
+-----------+
| +--------------+
+->|RandomDropAF12|
+--------------+
Figure 6: Additional Data Path Example Part 2
5.2.2. Meter and Action Example Discussion
A simple Meter that can be parameterized by a single TBMeter entry is
shown here. For Metering types that require multiple TBMeter entries
for parameterization, a second level Meter and TBMeter table entries may
be used. For example, for [TRTCM], with the first level TBMeter entry
used for Peak Information Token Bucket, the first level SucceedNext
points to the second level Meter entry, with second level TBMeter entry
used for Committed Information Token Bucket.
5.2.3. Queue and Scheduler Example Discussion
Example in Figure 6 shows three classified input traffic streams, EF,
AF11, and AF12, feeding into their respective queue and algorithmic
droppers. After their respective dropping process, the AF traffic
streams feed into the same queue, QAF1X.
A Scheduler, AF, is shown in Figure 6, as the sink for AF1X queue
traffic, servicing AF1X queue with scheduling parameters indicated by
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SchdParamAF1X. This scheduler is used to service traffic from AF1X,
AF2X, AF3X queues using weighted fair queuing method. The AF2X and AF3X
queues are not shown in Figure 6, they can be very much like AF1X queue
setup.
Another traffic stream, EF, is handled by the EF queue. Scheduler
Diffserv services output of EF queue using SchdParamEF, and output of AF
scheduler using SchdParamAF, with Priority Queue scheduling method.
Notice all the diffserv traffic may go out on a link with traffic
shaping. The traffic shaping can be parameterize using the Shaping
| Scheduler in Figure 6. For shaping, the qosShapingRate attributes
should be used. The Shaping Scheduler is indicated as the last diffserv
functional element of this data path by using its Next pointer with
value of zeroDotZero.
6. Summary of the DiffServ PIB
The DiffServ PIB consists of one module containing the base PRCs for
setting DiffServ policy, queues, classifiers, meters, etc., and also
contains capability PRC's that allow a PEP to specify its device
characteristics to the PDP. This module contains two groups, which are
summarized in this section.
QoS Capabilities Group
This group consists of PRCs to indicate to the PDP the types of
interface supported on the PEP in terms of their QoS capabilities
and PRCs that the PDP can install in order to configure these
interfaces (queues, scheduling parameters, buffer sizes, etc.) to
affect the desired policy. This group describes capabilities in
terms of the types of interfaces and takes configuration in terms
of interface types and role combinations [FR-PIB]; it does not deal
with individual interfaces on the device.
QoS Policy Group
This group contains configuration of the functonal elements that
comprise the QoS policy that applies to an interface and the
specific parameters that describe those elements. This group
contains classifiers, meters, actions, droppers, queues and
schedulers. This group also contains the PRC that associates the
datapath elements with role combinations.
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7. PIB Operational Overview
This section provides an operation overview of configuring DiffServ QoS
policy.
After initial PEP to PDP communication setup, using [COPS-PR] for
example, the PEP will provide to the PDP the PIB Provisioning Classes
(PRCs), interface types, and interface type capabilities it supports.
The PRCs supported by the PEP are reported to the PDP in the PRC Support
Table, frwkPrcSupportTable defined in the framework PIB [FR-PIB]. Each
instance of the frwkPrcSupportTable indicates a PRC that the PEP
understands and for which the PDP can send class instances as part of
the policy information.
The interface types the PEP supports are described by rows in the
interface type table, frwkIfCapsSetTable. Each row, or instance of this
class contains a pointer to a instance of a PRC that describes the
capabilities of the interface type. The capability objects may reside
in the qosIfClassifierCapsTable, the qosIfMeterCapsTable, the
qosIfSchedulerCapsTable, the qosIfElmDepthCapsTable, the
qosIfElmOutputCapsTable, or in a table defined in another PIB.
The PDP, with knowledge of the PEP's capabilities, then provides the PEP
with administration domain and interface-specific policy information.
Instances of the qosDataPathTable are used to specify the first element
in the set of functional elements applied to an interface. Each
instance of the qosDataPathTable applies to an interface type defined by
its roles and direction (ingress or egress).
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8. PIB Definitions
8.1. The DiffServ Base PIB
DIFFSERV-PIB PIB-DEFINITIONS ::= BEGIN
IMPORTS
Unsigned32, Integer32,
MODULE-IDENTITY, OBJECT-TYPE
FROM COPS-PR-SPPI
zeroDotZero
FROM SNMPv2-SMI
TruthValue, TEXTUAL-CONVENTION
FROM SNMPv2-TC
InstanceId, ReferenceId, TagId, TagReference
FROM COPS-PR-SPPI
RoleCombination
FROM FRAMEWORK-PIB
Dscp
FROM DIFFSERV-DSCP-TC;
IfDirection
FROM DIFF-SERV-MIB;
BurstSize
FROM INTEGRATED-SERVICES-MIB;
qosPolicyPib MODULE-IDENTITY
SUBJECT-CATEGORIES { tbd -- QoS Client Type
}
LAST-UPDATED "200103021800Z"
ORGANIZATION "IETF DIFFSERV WG"
CONTACT-INFO "
Michael Fine
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706 USA
Phone: +1 408 527 8218
Email: mfine@cisco.com
Keith McCloghrie
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Cisco Systems, Inc.
170 West Tasman Drive,
San Jose, CA 95134-1706 USA
Phone: +1 408 526 5260
Email: kzm@cisco.com
John Seligson
Nortel Networks, Inc.
4401 Great America Parkway
Santa Clara, CA 95054 USA
Phone: +1 408 495 2992
Email: jseligso@nortelnetworks.com"
DESCRIPTION
"The PIB module containing a set of provisioning classes
that describe quality of service (QoS) policies for
DiffServ. It includes general classes that may be extended
by other PIB specifications as well as a set of PIB
classes related to IP processing."
::= { tbd }
qosCapabilityClasses OBJECT IDENTIFIER ::= { qosPolicyPib 1 }
qosPolicyClasses OBJECT IDENTIFIER ::= { qosPolicyPib 2 }
qosPolicyParameters OBJECT IDENTIFIER ::= { qosPolicyPib 3 }
--
-- Interface Capabilities Group
--
--
-- Interface Type Capability Tables
--
-- The Interface type capability tables define capabilities that may
-- be associated with an interface of a specific type. This PIB
-- defines three such tables: a classification capabilities table, a
-- metering capabilities table and a scheduling capabilities table.
-- Other PIBs may define other capability tables to augment the
-- capability definitions of these tables or to introduce completely
-- new capabilities.
--
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-- Classification Capabilities
--
--
-- The Base Capability Table
--
qosBaseIfCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosBaseIfCapsEntry
PIB-ACCESS notify, 3
STATUS current
DESCRIPTION
"The Base Interface Capability class. This class represents
a generic capability supported by a device in the ingress,
egress or both directions."
::= { qosCapabilityClasses 1 }
qosBaseIfCapsEntry OBJECT-TYPE
SYNTAX QosBaseIfCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the qosBaseIfCaps class."
PIB-INDEX { qosBaseIfCapsPrid }
QosBaseIfCapsEntry ::= SEQUENCE {
qosBaseIfCapsPrid InstanceId,
qosBaseIfCapsDirection Integer32
}
qosBaseIfCapsPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosBaseIfCapsEntry 1 }
qosBaseIfCapsDirection OBJECT-TYPE
SYNTAX Integer32 {
inbound(1),
outbound(2),
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inAndOut(3)
}
STATUS current
DESCRIPTION
"This object specifies the direction(s) for which the capability
applies. A value of 'inbound(1)' means the capability applies
only to the ingress direction. A value of 'outbound(2)' means
the capability applies only to the egress direction. A value of
'inAndOut(3)' means the capability applies to both directions."
::= { qosBaseIfCapsEntry 2 }
--
-- The Classification Capability Table
--
qosIfClassificationCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfClassificationCapsEntry
PIB-ACCESS notify, 2
STATUS current
DESCRIPTION
"This table specifies the classification capabilities of an
interface type"
::= { qosCapabilityClasses 2 }
qosIfClassificationCapsEntry OBJECT-TYPE
SYNTAX QosIfClassificationEntry
STATUS current
DESCRIPTION
"An instance of this class describes the classification
capabilities of an interface."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfClassificationCapsSpec }
::= { qosIfClassificationCapsTable 1 }
QosIfClassificationCapsEntry ::= SEQUENCE {
qosIfClassificationCapsSpec BITS
}
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qosIfClassificationCapsSpec OBJECT-TYPE
SYNTAX BITS {
ipSrcAddrClassification(1),
-- indicates the ability to classify based on
-- IP source addresses
ipDstAddrClassification(2),
-- indicates the ability to classify based on
-- IP destination addresses
ipProtoClassification(3),
-- indicates the ability to classify based on
-- IP protocol numbers
ipDscpClassification(4)
-- indicates the ability to classify based on
-- IP DSCP
ipL4Classification(5)
-- indicates the ability to classify based on
-- IP layer 4 port numbers for UDP and TCP
}
STATUS current
DESCRIPTION
"Bit set of supported classification capabilities. In
addition to these capabilities, other PIBs may define other
capabilities that can then be specified in addition to the
ones specified here (or instead of the ones specified here if
none of these are specified)."
::= { qosIfClassificationCapsEntry 1 }
--
-- Metering Capabilities
--
qosIfMeteringCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfMeteringCapsEntry
PIB-ACCESS notify, 2
STATUS current
DESCRIPTION
"This table specifies the metering capabilities of an
interface type"
::= { qosCapabilityClasses 3 }
qosIfMeteringCapsEntry OBJECT-TYPE
SYNTAX QosIfMeteringCapsEntry
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STATUS current
DESCRIPTION
"An instance of this class describes the classification
capabilities of an interface."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfMeteringCapsSpec }
::= { qosIfMeteringCapsTable 1 }
QosIfMeteringCapsEntry ::= SEQUENCE {
qosIfMeteringCapsSpec BITS
}
qosIfMeteringCapsSpec OBJECT-TYPE
SYNTAX BITS {
meterByRemarking (1),
meterByDropping (2),
-- These capabilities indicate if the interface
-- can remark out of profile packets or drop them,
-- respectively
}
STATUS current
DESCRIPTION
"Bit set of supported metering capabilities. As with
classification capabilities, these metering capabilities may
be augmented by capabilities specified in other PRCs (in other
PIBs)."
::= { qosIfMeteringCapsEntry 1 }
--
-- Algorithmic Dropper Capabilities
--
-- This capability table indicates the types of algorithmic
-- drop supported by an interface type for a specific flow
-- direction.
-- Additional capabilities affecting the drop functionalities
-- are determined based on queue capabilities associated with
-- specific instance of a dropper, hence not specified by
-- this table.
--
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qosIfAlgDropCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfAlgDropCapsEntry
PIB-ACCESS notify, 2
STATUS current
DESCRIPTION
"This table specifies the algorithmic dropper
capabilities of an interface type"
::= { qosCapabilityClasses 4 }
qosIfAlgDropCapsEntry OBJECT-TYPE
SYNTAX QosIfAlgDropCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the algorithm dropper
capabilities of an interface."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfAlgDropCapsType }
::= { qosIfAlgDropCapsTable 1 }
QosIfAlgDropCapsEntry ::= SEQUENCE {
qosIfAlgDropCapsType BITS
}
qosIfAlgDropCapsType OBJECT-TYPE
SYNTAX BITS {
tailDrop(2),
headDrop(3),
randomDrop(4) }
STATUS current
DESCRIPTION
"The type of algorithm that droppers associated with queues
may use.
The tailDrop(2) algorithm means that packets are dropped from
the tail of the queue when the associated queue's MaxQueueSize is
exceeded. The headDrop(3) algorithm means that packets are
dropped from the head of the queue when the associated queue's
MaxQueueSize is exceeded. The randomDrop(4) algorithm means that
an algorithm is executed which may randomly
drop the packet, or drop other packet(s) from the queue
in its place. The specifics of the algorithm may be
proprietary. However, parameters would be specified in the
qosRandomDropTable."
::= { qosIfAlgDropCapsEntry 1 }
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--
-- Queue Capabilities
--
qosIfQueueCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfQueueCapsEntry
PIB-ACCESS notify, 4
STATUS current
DESCRIPTION
"This table specifies the scheduling capabilities of an
interface type"
::= { qosCapabilityClasses 5 }
qosIfQueueCapsEntry OBJECT-TYPE
SYNTAX QosIfSchedulerCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the queue
capabilities of an interface type."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfQueueCapsMinQueueSize,
qosIfQueueCapsMaxQueueSize,
qosIfQueueCapsTotalQueueSize }
::= { qosIfQueueCapsTable 1 }
QosIfQueueCapsEntry ::= SEQUENCE {
qosIfQueueCapsMinQueueSize Unsigned32,
qosIfQueueCapsMaxQueueSize Unsigned32,
qosIfQueueCapsTotalQueueSize Unsigned32
}
qosIfQueueCapsMinQueueSize OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"Some interfaces may allow the size of a queue to be
configured. This attribute specifies the minimum size that
can be configured for a queue, specified in bytes."
::= { qosIfQueueCapsEntry 1 }
qosIfQueueCapsMaxQueueSize OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
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"Some interfaces may allow the size of a queue to be
configured. This attribute specifies the maximum size that
can be configured for a queue, specified in bytes."
::= { qosIfQueueCapsEntry 2 }
qosIfQueueCapsTotalQueueSize OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"Some interfaces may have a limited buffer space to be share
amoungst all queues of that interface while also allowing the
size of each queue to be configurable. To prevent the
situation where the PDP configures the sizes of the queues in
excess of the total buffer available to the interface, the PEP
can report the total buffer space in bytes available with this
capability."
::= { qosIfQueueCapsEntry 3 }
--
-- Scheduler Capabilities
--
qosIfSchedulerCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfSchedulerCapsEntry
PIB-ACCESS notify, 3
STATUS current
DESCRIPTION
"This table specifies the scheduler capabilities of an
interface type"
::= { qosCapabilityClasses 6 }
qosIfSchedulerCapsEntry OBJECT-TYPE
SYNTAX QosIfSchedulerCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the scheduler
capabilities of an interface type."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfSchedulerCapsServiceDisc,
qosIfSchedulerCapsMaxInputs }
::= { qosIfSchedulerCapsTable 1 }
QosIfSchedulerCapsEntry ::= SEQUENCE {
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qosIfSchedulerCapsServiceDisc OBJECT IDENTIFIER,
qosIfSchedulerCapsMaxInputs Unsigned32
}
qosIfSchedulerCapsServiceDisc OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The scheduling discipline for which the set of capabilities
specified in this object apply. Obejct identifiers for several
general purpose and well-known queuing disciplines are defined
in this PIB. Queueing disciplines defined in another PIB may
also be specified."
::= { qosIfSchedulerCapsEntry 1 }
qosIfSchedulerCapsMaxInputs OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The maximum number of queues that this interface type can
support for the scheduler type indicated by
qosIfSchedulerCapsServiceDisc. A value of zero means that there
is no maximum."
::= { qosIfSchedulerCapsEntry 2 }
--
-- Shaper Capabilities
--
qosIfShaperCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfShaperCapsEntry
PIB-ACCESS notify, 3
STATUS current
DESCRIPTION
"This table specifies the shaping capabilities of an
interface type"
::= { qosCapabilityClasses 7 }
qosIfShaperCapsEntry OBJECT-TYPE
SYNTAX QosIfShaperCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the shaping
capabilities of an interface type."
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EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfShaperCapsAlgorithm,
qosIfShaperCapsMaxNumberOfRates }
::= { qosIfShaperCapsTable 1 }
QosIfShaperCapsEntry ::= SEQUENCE {
qosIfShaperCapsAlgorithm OBJECT IDENTIFIER,
qosIfShaperCapsMaxNumberOfRates Unsigned32
}
qosIfShaperCapsAlgorithm OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The shaping method for which the set of capabilities
specified in this object apply. Values that may be
used for this attribute are TBD."
::= { qosIfShaperCapsEntry 1 }
qosIfShaperCapsMaxNumberOfRates OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The maximum number of rates shapers of the type indicated
by qosIfShaperCapsAlgorithm may have for this interface type
and flow direction."
::= { qosIfShaperCapsEntry 2 }
--
-- Datapath Element Linkage Capabilities
--
--
-- Datapath Element Cascade Depth
--
qosIfElmDepthCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfElmDepthCapsEntry
PIB-ACCESS notify, 3
STATUS current
DESCRIPTION
"This table specifies the number of elements of the same
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DiffServ QoS Policy Information Base February 2001
type that can be cascaded together in a data path."
::= { qosCapabilityClasses 8 }
qosIfElmDepthCapsEntry OBJECT-TYPE
SYNTAX QosIfElmDepthCapsEntry
STATUS current
DESCRIPTION
"An instance of this class describes the cascade depth
for a particular datapath functional element PRC. A
functional datapath element not represented in this
table can be assumed to have no specific maximum
depth."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfElmDepthCapsPrc }
::= { qosIfElmDepthCapsTable 1 }
QosIfElmDepthCapsEntry ::= SEQUENCE {
qosIfElmDepthCapsPrc OBJECT IDENTIFIER,
qosIfElmDepthCapsCascadeMax Unsigned32
}
qosIfElmDepthCapsPrc OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The object identifier of a PRC that represents a datapath
functional element. This may be one of: qosClfrElementEntry,
qosMeterEntry, qosActionEntry, qosAlgDropEntry, qosQEntry, or
qosSchedulerEntry. The value is the OID of the table entry.
There may not be more than one instance of this class with
the same value of qosIfElmDepthCapsPrc."
::= { qosIfElmDepthCapsEntry 1 }
qosIfElmDepthCapsCascadeMax OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The maximum number of elements of type qosIfElmDepthCapsPrc
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that can be linked consecutively in a data path." A value of
zero indicates there is no specific maximum."
::= { qosIfElmDepthCapsEntry 2 }
--
-- Datapath Element Linkage Types
--
qosIfElmLinkCapsTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosIfElmLinkCapsEntry
PIB-ACCESS notify, 4
STATUS current
DESCRIPTION
"This table specifies what types of datapath functional
elements may be used as the next downstream element for
a specific type of functional element."
::= { qosCapabilityClasses 9 }
qosIfElmLinkCapsEntry OBJECT-TYPE
SYNTAX QosIfElmLinkCapsEntry
STATUS current
DESCRIPTION
"An instance of this class specifies a PRC that may
be used as the next functional element after a specific
type of element in a data path."
EXTENDS { qosBaseIfCapsEntry }
UNIQUENESS { qosBaseIfCapsDirection,
qosIfElmLinkCapsPrc,
qosIfElmLinkCapsAttr,
qosIfElmLinkCapsNextPrc }
::= { qosIfElmLinkCapsTable 1 }
QosIfElmLinkCapsEntry ::= SEQUENCE {
qosIfElmLinkCapsPrc OBJECT IDENTIFIER,
qosIfElmLinkCapsAttr Unsigned32,
qosIfElmLinkCapsNextPrc OBJECT IDENTIFIER
}
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qosIfElmLinkCapsPrc OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The value is the OID of a PRC that represents a
functional datapath element."
::= { qosIfElmLinkCapsEntry 1 }
qosIfElmLinkCapsAttr OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The value represents the attribute in the the PRC
indicated by qosIfElmLinkCapsPrc that is used to
specify the next functional element in the datapath.
The attribute value corresponds to the order in which
the attribute appears in the definition of the PRC.
A value of 1 indicates the first attribute of the PRC,
a value of 2 indicates the second attribute of the
PRC, and so forth."
::= { qosIfElmLinkCapsEntry 2 }
qosIfElmLinkCapsNextPrc OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The value is the OID of a PRC table entry from which
instances can be referenced by the attribute indicated
by qosIfElmLinkCapsPrc and qosIfElmLinkAttr.
For example, suppose a meter's success output can be an
action or another meter, and the fail output can only be
an action. This can be expressed as follows:
Prid Prc Attr NextPrc
1 qosMeterEntry qosMeterSucceedNext qosActionEntry
2 qosMeterEntry qosMeterSucceedNext qosMeterEntry
3 qosMeterEntry qosMeterFailNext qosActionEntry."
::= { qosIfElmLinkCapsEntry 3 }
--
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-- Policy Classes
--
--
-- Data Path Table
--
-- The Data Path Table enumerates the Differentiated Services
-- Data Paths within this device. Each entry specifies
-- the first functional datapath element to process data flow
-- for each specific datapath. Each datapath is defined by the
-- interface role combination and direction. This table can
-- therefore have up to two entries for each role combination,
-- ingress and egress.
qosDataPathTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosDataPathEntry
PIB-ACCESS install, 6
STATUS current
DESCRIPTION
"The data path table defines the data paths in this
device. Each data path is defined by the interface,
role combination and traffic direction. The first
functional datapath element to handle traffic for
this data path is defined by a Prid in the entries
of this table."
::= { qosPolicyClasses 1 }
qosDataPathEntry OBJECT-TYPE
SYNTAX QosDataPathEntry
STATUS current
DESCRIPTION
"An entry in the data path table describes a single
data path in this device."
PIB-INDEX { qosDataPathPrid }
UNIQUENESS { qosDataPathRoles,
qosDataPathIfDirection }
::= { qosDataPathTable 1 }
QosDataPathEntry ::= SEQUENCE {
qosDataPathPrid InstanceId,
qosDataPathIfName SnmpAdminString,
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qosDataPathRoles RoleCombination,
qosDataPathIfDirection IfDirection,
qosDataPathStart Prid
}
qosDataPathPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosDataPathEntry 1 }
qosDataPathIfName OBJECT-TYPE
SYNTAX SnmpAdminString
STATUS current
DESCRIPTION
"The interface capability set to which this data path entry
applies. The interface capability name specified by this
attribute must exist in the frwkIfCapSetTable [FR-PIB] prior
to association with an instance of this class."
::= { qosDataPathEntry 2 }
qosDataPathRoles OBJECT-TYPE
SYNTAX RoleCombination
STATUS current
DESCRIPTION
"The interfaces to which this data path entry applies,
specified in terms of roles. There must exist an entry
in the frwkIfCapSetRoleComboTable [FR-PIB] specifying
this role combination, together with the interface
capability set specified by qosDataPathIfName, prior to
association with an instance of this class."
::= { qosDataPathEntry 3 }
qosDataPathIfDirection OBJECT-TYPE
SYNTAX IfDirection
STATUS current
DESCRIPTION
"Specifies the direction for which this data path
entry applies on this interface."
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::= { qosDataPathEntry 4 }
qosDataPathStart OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This selects the first functional datapath element
to handle traffic for this data path. This
Prid should point to an instance of one of:
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry
The PRI to must exist prior to the installation of
this datapath start element."
::= { qosDataPathEntry 5 }
--
-- Classifiers
--
--
-- Classifier Table
--
-- Classifier allows multiple classifier elements, of same or different
-- types, to be used together.
-- A classifier must completely classify all packets presented to it.
-- This means all traffic handled by a classifier must match
-- at least one classifier element within the classifier,
-- with the classifier element parameters specified by a filter.
qosClfrTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosClfrEntry
PIB-ACCESS install, 3
STATUS current
DESCRIPTION
""
REFERENCE
"[MODEL] section 4.1"
::= { qosPolicyClasses 2 }
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qosClfrEntry OBJECT-TYPE
SYNTAX QosClfrEntry
STATUS current
DESCRIPTION
"An entry in the classifier table describes a
single classifier. Each classifier element belong-
ing to the this classifier must have its
qosClfrElementClfrId attribute equal to qosClfrId."
PIB-INDEX { qosClfrPrid }
UNIQUENESS { qosClfrId }
::= { qosClfrTable 1 }
QosClfrEntry ::= SEQUENCE {
qosClfrPrid InstanceId,
qosClfrId TagReference
}
qosClfrPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosClfrEntry 1 }
qosClfrId OBJECT-TYPE
SYNTAX TagReference
PIB-TAG qosClfrElementClfrId
STATUS current
DESCRIPTION
"Identifies a Classifier. A Classifier must be
complete, this means all traffic handled by a
Classifier must match at least one Classifier
Element within the Classifier."
::= { qosClfrEntry 2 }
--
-- Classifier Element Table
--
-- Entries in the classifier element table serves as
-- the anchor for each classification pattern, defined
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-- in filter table entries. Each classifier element
-- table entry also specifies the subsequent downstream
-- diffserv functional datapath element when the
-- classification pattern is satisfied.
-- Each entry in the classifier element table describes
-- one branch of the fan-out characteristic of a classifier
-- indicated in [MODEL] section 4.1. A classifier is made up
-- of one or more classifier elements.
--
qosClfrElementTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosClfrElementEntry
PIB-ACCESS install, 6
STATUS current
DESCRIPTION
"The classifier element table enumerates the rela-
tionship between classification patterns and subse-
quent downstream diffserv functional data path ele-
ments. Classification parameters are defined by
entries of filter tables pointed to by
qosClfrElementSpecific. There can be filter
tables of different types, and they can be inter-
mixed and used within a classifier. An example of a
filter table is the frwkIpFilterTable, defined in
[FR-PIB], for IP Multi-Field Classifiers (MFCs).
Filter tables for other filter types may be defined
elsewhere."
REFERENCE
"[MODEL] section 4.1"
::= { qosPolicyClasses 3 }
qosClfrElementEntry OBJECT-TYPE
SYNTAX QosClfrElementEntry
STATUS current
DESCRIPTION
"An entry in the classifier element table describes a
single element of the classifier."
PIB-INDEX { qosClfrElementPrid }
UNIQUENESS { qosClfrElementClfrId,
qosClfrElementOrder,
qosClfrElementSpecific }
::= { qosClfrElementTable 1 }
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QosClfrElementEntry ::= SEQUENCE {
qosClfrElementPrid InstanceId,
qosClfrElementClfrId TagId,
qosClfrElementPrecedence Unsigned32,
qosClfrElementNext Prid,
qosClfrElementSpecific Prid
}
qosClfrPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosClfrElementEntry 1 }
qosClfrElementClfrId OBJECT-TYPE
SYNTAX TagId
STATUS current
DESCRIPTION
"A classifier Id identifies which classifier this
classifier element is a part of. This needs to be
the value of qosClfrId attribute for an existing
instance of qosClfrEntry."
::= { qosClfrElementEntry 2 }
qosClfrElementPrecedence OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The relative order in which classifier elements are
applied: higher numbers represent classifier elements
with higher precedence. Classifier elements with the same
order must be unambiguous i.e. they must define
non-overlapping patterns, and are considered to be
applied simultaneously to the traffic stream. Clas-
sifier elements with different order may overlap in
their filters: the classifier element with the highest
order that matches is taken.
On a given interface, there must be a complete clas-
sifier in place at all times in the
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ingress direction. This means that there will always
be one or more filters that match every possible pat-
tern that could be presented in an incoming packet.
There is no such requirement in the egress direction."
DEFVAL { 0 }
::= { qosClfrElementEntry 3 }
qosClfrElementNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This attribute provides one branch of the fan-out
functionality of a classifier described in [MODEL]
section 4.1.
This selects the next diffserv functional datapath
element to handle traffic for this data path.
A value of zeroDotZero marks the end of DiffServ processing
for this data path. Any other value must point to a
valid (pre-existing) instance of one of:"
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry."
DEFVAL { zeroDotZero }
::= { qosClfrElementEntry 4 }
qosClfrElementSpecific OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"A pointer to a valid entry in another table that
describes the applicable classification filter, e.g.
an entry in frwkIpFilterTable [FR-PIB].
The PRI pointed to must exist prior to the installation of
this classifier element.
The value zeroDotZero is interpreted to match any-
thing not matched by another classifier element - only one
such entry may exist for each classifier."
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DEFVAL { zeroDotZero }
::= { qosClfrElementEntry 5 }
--
-- Meters
--
-- This PIB supports a variety of Meters. It includes a
-- specific definition for Meters whose parameter set can
-- be modelled using Token Bucket parameters.
-- Other metering parameter sets can be defined and used
-- when necessary.
--
-- Multiple meter elements may be logically cascaded
-- using their qosMeterSucceedNext pointers if
-- a multi-rate Meter is required.
-- One example of this might be for an AF PHB implementation
-- that uses two-rate meters.
--
-- Cascading of individual meter elements in the PIB is intended
-- to be functionally equivalent to determining the conformance
-- level of a packet using a multi-rate meter. The sequential
-- nature of the representation is merely a notational
-- convenience for this PIB.
--
-- For example:
-- Conforming to RFC 2697, srTCM can be parameterized using
-- two sets of qosMeterEntry and qosTBMeterEntry.
-- With the first set parameterizing the Committed Burst Size
-- token-bucket, second set parameterizing the Excess Burst Size
-- token-bucket. With both set's qosTBMeterRate parameters
-- being used to reflect the Committed Information Rate value.
--
-- Conforming to RFC 2698, trTCM can be parameterized using
-- two sets of qosMeterEntry and qosTBMeterEntry.
-- With the first set parameterizing the Peak Information Rate
-- and Peak Burst Size token-bucket, second set parameterizing
-- the Committed Information Rate and Committed Burst Size
-- token-bucket.
--
-- Conforming to RFC 2859, tswTCM can be parameterized using
-- two sets of qosMeterEntry and qosTBMeterEntry.
-- With the first set parameterizing the Committed Target Rate,
-- second set parametering the Peak Target Rate.
-- With both set's qosTBMeterInterval being used to
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-- reflect the Average Interval as specified by RFC 2859.
--
qosMeterTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosMeterEntry
PIB-ACCESS install, 5
STATUS current
DESCRIPTION
"This table enumerates specific meters that a system
may use to police a stream of traffic. The traffic
stream to be metered is determined by the element(s)
upstream of the meter i.e. by the object(s) that
point to each entry in this table. This may include
all traffic on an interface.
Specific meter details are to be found in
qosMeterSpecific."
REFERENCE
"[MODEL] section 5.1"
::= { qosPolicyClasses 4 }
qosMeterEntry OBJECT-TYPE
SYNTAX QosMeterEntry
STATUS current
DESCRIPTION
"An entry in the meter table describing a single
meter."
PIB-INDEX { qosMeterPrid }
UNIQUENESS { }
::= { qosMeterTable 1 }
QosMeterEntry ::= SEQUENCE {
qosMeterPrid InstanceId,
qosMeterSucceedNext Prid,
qosMeterFailNext Prid,
qosMeterSpecific Prid
}
qosMeterPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
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DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosMeterEntry 1 }
qosMeterSucceedNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"If the traffic does conform, this selects the next
diffserv functional datapath element to handle
traffic for this data path.
The value zeroDotZero in this variable indicates no
further Diffserv treatment is performed on traffic of
this datapath. Any other value must point to a valid
(pre-existing) instance of one of:"
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry."
DEFVAL { zeroDotZero }
::= { qosMeterEntry 2 }
qosMeterFailNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"If the traffic does not conform, this selects the
next diffserv functional datapath element to handle
traffic for this data path.
The value zeroDotZero in this variable indicates no
further Diffserv treatment is performed on traffic of
this datapath. Any other value must point to a valid
(pre-existing) instance of one of:"
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry."
DEFVAL { zeroDotZero }
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::= { qosMeterEntry 3 }
qosMeterSpecific OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This indicates the behaviour of the meter by point-
ing to an entry containing detailed parameters. Note
that entries in that specific table must be managed
explicitly.
For example, qosMeterSpecific may point to an
entry in qosTBMeterTable, which contains an
instance of a single set of Token Bucket parameters.
The PRI pointed to must exist prior to installing this
Meter datapath element."
::= { qosMeterEntry 5 }
--
-- Token-Bucket Parameter Table
--
-- Each entry in the Token Bucket Parameter Table parameterizes
-- a single token bucket. Multiple token buckets can be
-- used together to parameterize multiple levels of
-- conformance.
--
-- Entries of this table are used for both policing, as token
-- bucket parameters, and shaping, as leaky bucket parameters.
--
-- Note that an entry in the Token Bucket Parameter Table can
-- be shared, pointed to, by multiple qosMeterTable
-- and qosSchedulerTable entries.
--
qosTBParamTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosTBParamEntry
PIB-ACCESS install, 6
STATUS current
DESCRIPTION
"This table enumerates specific token-bucket meters
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DiffServ QoS Policy Information Base February 2001
that a system may use to police a stream of traffic.
Such meters are modelled here as having a single rate
and a single burst size. Multiple entries are used
when multiple rates/burst sizes are needed."
REFERENCE
"[MODEL] section 5.1"
::= { qosPolicyClasses 5 }
qosTBParamEntry OBJECT-TYPE
SYNTAX QosTBParamEntry
STATUS current
DESCRIPTION
"An entry that describes a single token-bucket meter."
PIB-INDEX { qosTBParamPrid }
UNIQUENESS { qosTBParamType,
qosTBParamRate,
qosTBParamBurstSize,
qosTBParamInterval }
::= { qosTBParamTable 1 }
QosTBParamEntry ::= SEQUENCE {
qosTBParamPrid InstanceId,
qosTBParamType OBJECT IDENTIFIER,
qosTBParamRate Unsigned32,
qosTBParamBurstSize BurstSize,
qosTBParamInterval Unsigned32
}
qosTBParamPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosTBParamEntry 1 }
qosTBParamType OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The Metering/Shaping algorithm associated with the
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Token/Leaky Bucket parameters.
Standard values for generic algorithms are as follows:
qosTBParamSimpleTokenBucket, qosTBParamAvgRate,
qosTBParamSrTCMBlind, qosTBParamSrTCMAware,
qosTBParamTrTCMBlind, qosTBParamTrTCMAware,
qosTBParamTswTCM
are specified in this PIB as OBJECT-IDENTITYs; additional values
may be further specified in other PIBs."
REFERENCE
"[MODEL] section 5"
::= { qosTBParamEntry 2 }
qosTBParamRate OBJECT-TYPE
SYNTAX Unsigned32
UNITS "kilobits per second"
STATUS current
DESCRIPTION
"The token-bucket rate, in kilobits per second
(kbps). This attribute is used for: 1. CIR in RFC
2697 for srTCM 2. PIR and CIR in FRC 2698 for trTCM
3. CTR and PTR in RFC 2859 for TSWTCM 4. AverageRate
used in [MODEL] section 5."
::= { qosTBParamEntry 3 }
qosTBParamBurstSize OBJECT-TYPE
SYNTAX BurstSize
UNITS "Bytes"
STATUS current
DESCRIPTION
"The maximum number of bytes in a single transmission
burst. This attribute is used for: 1. CBS and EBS in
RFC 2697 for srTCM 2. CBS and PBS in FRC 2698 for
trTCM 3. Burst Size used in [MODEL] section 5."
::= { qosTBParamEntry 4 }
qosTBparamInterval OBJECT-TYPE
SYNTAX Unsigned32
UNITS "microseconds"
STATUS current
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DESCRIPTION
"The time interval used with the token bucket. For:
1. Average Rate Meter, [MODEL] section 5.2.1, -
Delta. 2. Simple Token Bucket Meter, [MODEL] section
5.1, - time interval t. 3. RFC 2859 TSWTCM, -
AVG_INTERVAL. 4. RFC 2697 srTCM, RFC 2698 trTCM, -
token bucket update time interval."
::= { qosTBParamEntry 5 }
--
-- Actions
--
--
-- The Action Table allows enumeration of the different
-- types of actions to be applied to a traffic flow.
--
qosActionTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosActionEntry
PIB-ACCESS install, 5
STATUS current
DESCRIPTION
"The Action Table enumerates actions that can be per-
formed to a stream of traffic. Multiple actions can
be concatenated. For example, after marking a stream
of traffic exiting from a meter, a device can then
perform a mark action of the conforming or non-
conforming traffic.
Specific actions are indicated by qosAction-
Specific which points to an entry of a specific
action type parameterizing the action in detail."
REFERENCE
"[MODEL] section 6."
::= { qosPolicyClasses 6 }
qosActionEntry OBJECT-TYPE
SYNTAX QosActionEntry
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STATUS current
DESCRIPTION
"Each entry in the action table allows description of
one specific action to be applied to traffic."
PIB-INDEX { qosActionPrid }
UNIQUENESS { }
::= { qosActionTable 1 }
QosActionEntry ::= SEQUENCE {
qosActionPrid InstanceId,
qosActionNext Prid,
qosActionSpecific Prid,
qosActionType INTEGER
}
qosActionPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosActionEntry 1 }
qosActionNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This selects the next diffserv functional datapath
element to handle traffic for this data path.
The value zeroDotZero in this variable indicates no
further Diffserv treatment is performed on traffic of
this datapath. Any other value must point to a valid
(pre-existing) instance of one of:"
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry."
DEFVAL { zeroDotZero }
::= { qosActionEntry 2 }
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qosActionSpecific OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"A pointer to an object instance providing additional
information for the type of action indicated by this
action table entry.
This attribute is meaningful only if qosActionType is
specific(2). For other action types, this attribute
should be NULL.
For the standard actions defined by this PIB module,
this should point to an instance of
qosDscpMarkActEntry. For other actions, it may point
to an instance of a PRC defined in some other PIB.
The PRI pointed to must exist prior to installing this
action datapath entry."
::= { qosActionEntry 3 }
qosActionType OBJECT-TYPE
SYNTAX INGEGER {
specific(2),
absoluteDrop(3)
}
STATUS current
DESCRIPTION
"This attribute indicates how the parameters of the
action are to be specified.
A value of specific(2) indicates that the action
paramters are described in the instance of the PRC
pointed to by qosActionSpecific.
A value of absoluteDrop(3) indicates that the absolute
drop action to be taken, and that no additional
parameters apply to this action. For this action
type, the value of qosActionSpecific should be
zeroDotZero."
::= { qosActionEntry 4 }
-- DSCP Mark Action Table
--
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-- Rows of this table are pointed to by qosActionSpecific
-- to provide detailed parameters specific to the DSCP
-- Mark action.
--
qosDscpMarkActTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosDscpMarkActEntry
PIB-ACCESS install, 3
STATUS current
DESCRIPTION
"This table enumerates specific DSCPs used for mark-
ing or remarking the DSCP field of IP packets. The
entries of this table may be referenced by a
qosActionSpecific attribute."
REFERENCE
"[MODEL] section 6.1"
::= { qosPolicyClasses 7 }
qosDscpMarkActEntry OBJECT-TYPE
SYNTAX QosDscpMarkActEntry
STATUS current
DESCRIPTION
"An entry in the DSCP mark action table that
describes a single DSCP used for marking."
PIB-INDEX { qosDscpMarkActPrid }
INDEX { qosDscpMarkActDscp }
UNIQUENESS { qosDscpMarkActDscp }
::= { qosDscpMarkActTable 1 }
QosDscpMarkActEntry ::= SEQUENCE {
qosDscpMarkActPrid InstanceId,
qosDscpMarkActDscp Dscp
}
qosDscpMarkActPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosDscpMarkActEntry 1 }
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qosDscpMarkActDscp OBJECT-TYPE
SYNTAX Dscp
STATUS current
DESCRIPTION
"The DSCP that this Action uses for marking/remarking
traffic. Note that a DSCP value of -1 is not permit-
ted in this table. It is quite possible that the
only packets subject to this Action are already
marked with this DSCP. Note also that Diffserv may
result in packet remarking both on ingress to a net-
work and on egress from it and it is quite possible
that ingress and egress would occur in the same
router."
::= { qosDscpMarkActEntry 2 }
--
-- Algorithmic Drop Table
--
qosAlgDropTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosAlgDropEntry
PIB-ACCESS install, 7
STATUS current
DESCRIPTION
"The algorithmic drop table contains entries describ-
ing an element that drops packets according to some
algorithm."
REFERENCE
"[MODEL] section 7.1.3"
::= { qosPolicyClasses 9 }
qosAlgDropEntry OBJECT-TYPE
SYNTAX QosAlgDropEntry
STATUS current
DESCRIPTION
"An entry describes a process that drops packets
according to some algorithm. Further details of the
algorithm type are to be found in qosAlgDropType
and with more detail parameter entry pointed to by
qosAlgDropSpecific when necessary."
PIB-INDEX { qosAlgDropPrid }
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UNIQUENESS { }
::= { qosAlgDropTable 1 }
QosAlgDropEntry ::= SEQUENCE {
qosAlgDropPrid InstanceId,
qosAlgDropType INTEGER,
qosAlgDropNext Prid,
qosAlgDropQMeasure Prid,
qosAlgDropQThreshold Unsigned32,
qosAlgDropSpecific Prid
}
qosAlgDropPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosAlgDropEntry 1 }
qosAlgDropType OBJECT-TYPE
SYNTAX INTEGER {
other(1),
tailDrop(2),
headDrop(3),
randomDrop(4)
}
STATUS current
DESCRIPTION
"The type of algorithm used by this dropper. A value
of tailDrop(2) or headDrop(3) represents an algorithm
that is completely specified by this PIB.
A value of other(1) indicates that the specifics of
the drop algorithm are specified in some other PIB
module, and that the qosAlgDropSpecific attribute
points to an instance of a PRC in that PIB that
specifies the information necessary to implement the
algorithm.
The tailDrop(2) algorithm is described as follows:
qosAlgDropQThreshold represents the depth of the
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queue, pointed to by qosAlgDropQMeasure, at
which all newly arriving packets will be dropped.
The headDrop(3) algorithm is described as follows: if
a packet arrives when the current depth of the queue,
pointed to by qosAlgDropQMeasure, is at
qosAlgDropQThreshold, packets currently at the head of
the queue are dropped to make room for the new packet
to be enqueued at the tail of the queue.
The randomDrop(4) algorithm is described as follows:
on packet arrival, an algorithm is executed which may
randomly drop the packet, or drop other packet(s)
from the queue in its place. The specifics of the
algorithm may be proprietary. For this algorithm,
qosAlgDropSpecific points to a qosRandomDropEntry
that describes the algorithm. For this
algorithm, qosAlgQThreshold is understood to be
the absolute maximum size of the queue and additional
parameters are described in qosRandomDropTable."
::= { qosAlgDropEntry 2 }
qosAlgDropNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This selects the next diffserv functional datapath
element to handle traffic for this data path.
The value zeroDotZero in this variable indicates no
further Diffserv treatment is performed on traffic of
this datapath. Any other value must point to a valid
(pre-existing) instance of one of:"
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry
qosQEntry."
DEFVAL { zeroDotZero }
::= { qosAlgDropEntry 3 }
qosAlgDropQMeasure OBJECT-TYPE
SYNTAX Prid
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STATUS current
DESCRIPTION
"Points to an entry in the qosQTable to indicate
the queue that a drop algorithm is to monitor when
deciding whether to drop a packet.
The PRI pointed to must exist prior to installing
this dropper element."
::= { qosAlgDropEntry 4 }
qosAlgDropQThreshold OBJECT-TYPE
SYNTAX Unsigned32
UNITS "Bytes"
STATUS current
DESCRIPTION
"A threshold on the depth in bytes of the queue being
measured at which a trigger is generated to the drop-
ping algorithm.
For the tailDrop(2) or headDrop(3) algorithms, this
represents the depth of the queue, pointed to by
qosAlgDropQMeasure, at which the drop action
will take place. Other algorithms will need to define
their own semantics for this threshold."
::= { qosAlgDropEntry 5 }
qosAlgDropSpecific OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"Points to a table entry that provides further detail
regarding a drop algorithm. The PRI pointed to
must exist prior to installing this dropper element.
Entries with qosAlgDropType equal to other(1)
must have this point to an instance of a PRC
defined in another PIB module.
Entries with qosAlgDropType equal to random-
Drop(4) must have this point to an entry in
qosRandomDropTable.
For all other algorithms, this should take the value
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zeroDotzero."
::= { qosAlgDropEntry 6 }
--
-- Random Drop Table
--
qosRandomDropTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosRandomDropEntry
PIB-ACCESS install, 9
STATUS current
DESCRIPTION
"The random drop table contains entries describing a
process that drops packets randomly. Entries in this
table is intended to be pointed to by
qosAlgDropSpecific."
REFERENCE
"[MODEL] section 7.1.3"
::= { qosPolicyClasses 10 }
qosRandomDropEntry OBJECT-TYPE
SYNTAX QosRandomDropEntry
STATUS current
DESCRIPTION
"An entry describes a process that drops packets
according to a random algorithm."
PIB-INDEX { qosRandomDropPrid }
UNIQUENESS { qosRandomDropMinThreshBytes,
qosRandomDropMinThreshPkts,
qosRandomDropMaxThreshBytes,
qosRandomDropMaxThreshPkts,
qosRandomDropProbMax,
qosRandomDropInvWeight,
qosRandomDropSamplingRate
::= { qosRandomDropTable 1 }
QosRandomDropEntry ::= SEQUENCE {
qosRandomDropPrid InstanceId,
qosRandomDropMinThreshBytes Unsigned32,
qosRandomDropMinThreshPkts Unsigned32,
qosRandomDropMaxThreshBytes Unsigned32,
qosRandomDropMaxThreshPkts Unsigned32,
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qosRandomDropProbMax Unsigned32,
qosRandomDropInvWeight Unsigned32,
qosRandomDropSamplingRate Unsigned32
}
qosRandomDropPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosRandomDropEntry 1 }
qosRandomDropMinThreshBytes OBJECT-TYPE
SYNTAX Unsigned32
UNITS "bytes"
STATUS current
DESCRIPTION
"The average queue depth in bytes, beyond which traffic has a
non-zero probability of being dropped."
::= { qosRandomDropEntry 2 }
qosRandomDropMinThreshPkts OBJECT-TYPE
SYNTAX Unsigned32
UNITS "packets"
STATUS current
DESCRIPTION
"The average queue depth in packets, beyond which traffic has a
non-zero probability of being dropped."
::= { qosRandomDropEntry 3 }
qosRandomDropMaxThreshBytes OBJECT-TYPE
SYNTAX Unsigned32
UNITS "bytes"
STATUS current
DESCRIPTION
"The average queue depth beyond which traffic has a probability
indicated by qosRandomDropProbMax of being dropped or
marked. Note that this differs from the physical queue limit,
which is stored in qosAlgDropQThreshold."
::= { qosRandomDropEntry 4 }
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qosRandomDropMaxThreshPkts OBJECT-TYPE
SYNTAX Unsigned32
UNITS "packets"
STATUS current
DESCRIPTION
"The average queue depth beyond which traffic has a probability
indicated by qosRandomDropProbMax of being dropped or
marked. Note that this differs from the physical queue limit,
which is stored in qosAlgDropQThreshold."
::= { qosRandomDropEntry 5 }
qosRandomDropProbMax OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The worst case random drop probability, expressed in drops per
thousand packets.
For example, if every packet may be dropped in the worst case
(100%), this has the value 1000. Alternatively, if in the worst
case one percent (1%) of traffic may be dropped, it has the value
10."
::= { qosRandomDropEntry 6 }
qosRandomDropInvWeight OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The weighting of past history in affecting the calculation of
the current queue average. The moving average of the queue depth
uses the inverse of this value as the factor for the new queue
depth, and one minus that inverse as the factor for the
historical average.
Implementations may choose to limit the acceptable set of values
to a specified set, such as powers of 2."
::= { qosRandomDropEntry 7 }
qosRandomDropSamplingRate OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
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"The number of times per second the queue is sampled for queue
average calculation. A value of zero means the queue is sampled
approximately each time a packet is enqueued (or dequeued)."
::= { qosRandomDropEntry 8 }
--
-- Queue Table
--
--
-- An entry of qosQTable represents a FIFO queue diffserv
-- functional data path element as described in [MODEL] section
-- 7.1.1.
-- Notice the specification of scheduling parameters for a queue
-- as part of the input to a scheduler functional data path
-- element as described in [MODEL] section 7.1.2. This allows
-- building of hierarchical queuing/scheduling.
-- A queue therefore is parameterized by:
-- 1. Which scheduler will service this queue, qosQNext.
-- 2. How the scheduler will service this queue, with respect
-- to all the other queues the same scheduler needs to service,
-- qosQWeight. |
--
-- Notice one or more upstream diffserv data path element may share,
-- point to, a qosQTable entry as described in [MODEL] section
-- 7.1.1.
--
qosQTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosQEntry
PIB-ACCESS install, 5
STATUS current
DESCRIPTION
"The Queue Table enumerates the individual queues on
an interface."
::= { qosPolicyClasses 11 }
qosQEntry OBJECT-TYPE
SYNTAX QosQEntry
STATUS current
DESCRIPTION
"An entry in the Queue Table describes a single queue
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in one direction on an interface."
PIB-INDEX { qosQPrid }
UNIQUENESS { }
::= { qosQTable 1 }
QosQEntry ::= SEQUENCE {
qosQPrid InstanceId,
qosQNext Prid,
qosQWeight Prid,
qosQShaper Prid
}
qosQPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosQEntry 1 }
qosQNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This selects the next diffserv functional datapath
element to handle traffic for this data path. This
value must point to a valid (pre-existing) instance
of one of:
qosSchedulerEntry"
::= { qosQEntry 2 }
qosQWeight OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This Prid indicates the entry in qosAssuredRateTable
the scheduler, pointed to by qosQNext, should use to service
this queue. If this value is zeroDotZero, then qosQShaper
must not be zeroDotZero. If this value is not zeroDotZero
then the instance pointed to must exist prior to installing
this entry."
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::= { qosQEntry 3 }
qosQShaper OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This Prid indicates the entry in qosShapingRateTable
the scheduler, pointed to by qosQNext, should use to service
this queue. If this value is zeroDotZero, then qosQWeight
must not be zeroDotZero. If this value is not zeroDotZero
then the instance pointed to must exist prior to installing
this entry."
::= { qosQEntry 4 }
--
-- Scheduler Table
--
--
-- The Scheduler Table is used for representing packet schedulers:
-- it provides flexibility for multiple scheduling algorithms, each
-- servicing multiple queues, to be used on the same logical/physical
-- interface.
-- Notice the servicing parameters the scheduler uses is
-- specified by each of its upstream functional data path elements,
-- most likely queues or schedulers.
-- The coordination and coherency between the servicing parameters
-- of the scheduler's upstream functional data path elements must
-- be maintained for the scheduler to function correctly.
--
-- The qosSchedulerShaper attribute is used for specifying |
-- the servicing parameters for output of a scheduler when its
-- downstream functional data path element is another scheduler.
-- This is used for building hierarchical queue/scheduler.
-- |
-- More discussion of the scheduler functional data path element
-- is in [MODEL] section 7.1.2.
--
qosSchedulerTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosSchedulerEntry
PIB-ACCESS install, 6
STATUS current
DESCRIPTION
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"The Scheduler Table enumerates packet schedulers.
Multiple scheduling algorithms can be used on a given
interface, with each algorithm described by one
qosSchedulerEntry."
REFERENCE
"[MODEL] section 7.1.2"
::= { qosPolicyClasses 12 }
qosSchedulerEntry OBJECT-TYPE
SYNTAX QosSchedulerEntry
STATUS current
DESCRIPTION
"An entry in the Scheduler Table describing a single
instance of a scheduling algorithm."
PIB-INDEX { qosSchedulerPrid }
UNIQUENESS { }
::= { qosSchedulerTable 1 }
QosSchedulerEntry ::= SEQUENCE {
qosSchedulerPrid InstanceId,
qosSchedulerNext Prid,
qosSchedulerMethod OBJECT IDENTIFIER,
qosSchedulerWeight Prid,
qosSchedulerShaper Prid
}
qosSchedulerPrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosSchedulerEntry 1 }
qosSchedulerSucceedNext OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This selects the next diffserv functional datapath
element to handle traffic for this data path.
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A value of zeroDotZero in this attribute indicates no
further Diffserv treatment is performed on traffic of
this datapath. The use of zeroDotZero is the normal
usage for the last functional datapath element. Any
value other than zeroDotZero must point to a valid
(pre-existing) instance of one of:
qosSchedulerEntry
qosQEntry (as indicated by [MODEL] section
7.1.4),
or
qosClfrEntry
qosMeterEntry
qosActionEntry
qosAlgDropEntry (for building multiple TCB's for the same
data path).
This can point to another qosSchedulerEntry
for implementation of multiple scheduler methods for
the same datapath, and for implementation of
hierarchical schedulers."
DEFVAL { zeroDotZero }
::= { qosSchedulerEntry 2 }
qosSchedulerMethod OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
STATUS current
DESCRIPTION
"The scheduling algorithm used by this Scheduler. Standard values
for generic algorithms: qosSchedulerPriority, qosSchedulerWRR,
and qosSchedulerWFQ are specified in this PIB;
additional values may be further specified in other PIBs."
REFERENCE
"[MODEL] section 7.1.2"
::= { qosSchedulerEntry 3 }
qosSchedulerWeight OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This Prid indicates the entry in qosAssuredRateTable
which indicates the priority or minimum output rate from this
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scheduler. This attribute is only used when there is more than
one level of scheduler. It should have the value of zeroDotZero
when not used."
DEFVAL { zeroDotZero }
::= { qosSchedulerEntry 4 }
qosSchedulerShaper OBJECT-TYPE
SYNTAX Prid
STATUS current
DESCRIPTION
"This Prid indicates the entry in qosShapingRateTable
which indicates the maximum output rate from this scheduler.
This attribute is only used when there is more than one level of
scheduler. It should have the value of zeroDotZero when not
used."
DEFVAL { zeroDotZero }
::= { qosSchedulerEntry 5 }
--
-- Assured Rate Parameters Table
--
-- This is used to specify parameters for the inputs to a
-- work-conserving scheduler.
--
-- The scheduling parameters are separate from the Queue Entries
-- for reusability and for usage by both queues and schedulers,
-- and this follows the separation of data path elements from
-- parameterization approach used through out this PIB.
-- Usage of scheduling parameter table entry by schedulers allow
-- building of hierarchical scheduling.
--
qosAssuredRateTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosAssuredRateEntry
PIB-ACCESS install, 5
STATUS current
DESCRIPTION
"The Assured Rate Table enumerates individual
sets of scheduling parameter that can be used/reused
by Queues and Schedulers."
::= { qosPolicyClasses 13 }
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qosAssuredRateEntry OBJECT-TYPE
SYNTAX QosAssuredRateEntry
STATUS current
DESCRIPTION
"An entry in the Assured Rate Table describes
a single set of scheduling parameter for use by
queues and schedulers."
PIB-INDEX { qosAssuredRatePrid }
UNIQUENESS { qosAssuredRatePriority,
qosAssuredRateAbs,
qosAssuredRateRel }
::= { qosAssuredRateTable 1 }
QosAssuredRateEntry ::= SEQUENCE {
qosAssuredRatePrid InstanceId,
qosAssuredRatePriority Unsigned32,
qosAssuredRateAbs Unsigned32,
qosAssuredRateRel Unsigned32
}
qosAssuredRatePrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosAssuredRateEntry 1 }
qosAssuredRatePriority OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The priority of this input to the associated scheduler, relative
to the scheduler's other inputs."
::= { qosAssuredRateEntry 2 }
qosAssuredRateAbs OBJECT-TYPE
SYNTAX Unsigned32
UNITS "kilobits per second"
STATUS current
DESCRIPTION
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"The minimum absolute rate, in kilobits/sec, that a
downstream scheduler element should allocate to this
queue. If the value is zero, then there is effec-
tively no minimum rate guarantee. If the value is
non-zero, the scheduler will assure the servicing of
this queue to at least this rate.
Note that this attribute's value is coupled to that
of qosAssuredRateRel: changes to one will
affect the value of the other. They are linked by the
following equation:
qosAssuredRateRel = qosAssuredRateAbs * 10000/ifSpeed
or, if appropriate:
qosAssuredRateRel = qosAssuredRateAbs * 10000 / ifHighSpeed"
REFERENCE
"ifSpeed, ifHighSpeed from [IFMIB]"
::= { qosAssuredRateEntry 3 }
qosAssuredRateRel OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The minimum rate that a downstream scheduler element
should allocate to this queue, relative to the max-
imum rate of the interface as reported by ifSpeed or
ifHighSpeed, in units of 1/10,000 of 1. If the value
is zero, then there is effectively no minimum rate
guarantee. If the value is non-zero, the scheduler
will assure the servicing of this queue to at least
this rate.
Note that this attribute's value is coupled to that
of qosAssuredRateAbs: changes to one will
affect the value of the other. They are linked by the
following equation:
qosAssuredRateAbs = ifSpeed * qosAssuredRateRel/10000
or, if appropriate:
qosAssuredRateAbs = ifHighSpeed * qosAssuredRateRel/10000"
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REFERENCE
"ifSpeed, ifHighSpeed from [IFMIB]"
::= { qosAssuredRateEntry 4 }
--
-- Shaping Rate Table
--
-- This contains attributes that are used to specify
-- non-work-conserving parameters to a scheduler for the purpose
-- of traffic shaping. These attributes limits the servicing of
-- the queue/scheduler, in affect, shaping the output of the
-- queue/scheduler, as described in [MODEL] section 7.2.
--
-- The scheduling parameters are separate from the Queue Entries
-- for reusability and for usage by both queues and schedulers,
-- and this follows the separation of data path elements from
-- parameterization approach used through out this PIB.
-- Usage of scheduling parameter table entry by schedulers allow
-- building of hierarchical scheduling.
--
qosShapingRateTable OBJECT-TYPE
SYNTAX SEQUENCE OF QosShapingRateEntry
PIB-ACCESS install, 6
STATUS current
DESCRIPTION
"The Shaping Rate Table enumerates individual
sets of scheduling parameter that can be used/reused
by Queues and Schedulers."
::= { qosPolicyClasses 14 }
qosShapingRateEntry OBJECT-TYPE
SYNTAX QosShapingRateEntry
STATUS current
DESCRIPTION
"An entry in the Assured Rate Table describes
a single set of scheduling parameter for use by
queues and schedulers."
PIB-INDEX { qosShapingRatePrid }
UNIQUENESS { qosShapingRateLevel,
qosShapingRateAbs,
qosShapingRateRel,
qosShapingRateThreshold }
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::= { qosShapingRateTable 1 }
QosShapingRateEntry ::= SEQUENCE {
qosShapingRatePrid InstanceId,
qosShapingRateLevel Unsigned32,
qosShapingRateAbs Unsigned32,
qosShapingRateRel Unsigned32,
qosShapingRateThreshold BurstSize
}
qosShapingRatePrid OBJECT-TYPE
SYNTAX InstanceId
STATUS current
DESCRIPTION
"An arbitrary integer index that uniquely identifies an
instance of the class."
::= { qosShapingRateEntry 1 }
qosShapingRateLevel OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"An index that indicates which level of a multi-rate shaper is
being given its parameters. By convention, increasing levels have
increasing rates."
::= { qosShapingRateEntry 2 }
qosShapingRateAbs OBJECT-TYPE
SYNTAX Unsigned32
UNITS "kilobits per second"
STATUS current
DESCRIPTION
"The maximum rate in kilobits/sec that a downstream
scheduler element should allocate to this queue. If
the value is zero, then there is effectively no max-
imum rate limit and that the scheduler should attempt
to be work-conserving for this queue. If the value
is non-zero, the scheduler will limit the servicing
of this queue to, at most, this rate in a non-work-
conserving manner.
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Note that this attribute's value is coupled to that
of qosShapingRateRel: changes to one will
affect the value of the other. They are linked by the
following equation:
qosShapingRateRel = qosShapingRateAbs * 10000/ifSpeed
or, if appropriate:
qosShapingRateRel = qosShapingRateAbs * 10000/ifHighSpeed"
REFERENCE
"ifSpeed, ifHighSpeed from [IFMIB]"
::= { qosShapingRateEntry 3 }
qosShapingRateRel OBJECT-TYPE
SYNTAX Unsigned32
STATUS current
DESCRIPTION
"The maximum rate that a downstream scheduler element
should allocate to this queue, relative to the max-
imum rate of the interface as reported by ifSpeed or
ifHighSpeed, in units of 1/10,000 of 1. If the value
is zero, then there is effectively no maximum rate
limit and the scheduler should attempt to be work-
conserving for this queue. If the value is non-zero,
the scheduler will limit the servicing of this queue
to, at most, this rate in a non-work-conserving
manner.
Note that this attribute's value is coupled to that
of qosShapingRateAbs: changes to one will
affect the value of the other. They are linked by the
following equation:
qosShapingRateAbs = ifSpeed * qosShapingRateRel/10000
or, if appropriate:
qosShapingRateAbs = ifHighSpeed * qosShapingRateRel/10000"
REFERENCE
"ifSpeed, ifHighSpeed from [IFMIB]"
::= { qosShapingRateEntry 4 }
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qosShapingRateThreshold OBJECT-TYPE
SYNTAX BurstSize
UNITS "Bytes"
STATUS current
DESCRIPTION
"The number of bytes of queue depth at which the rate of a
multi-rate scheduler will increase to the next output rate. In
the last conceptual row for such a shaper, this threshold is
ignored and by convention is zero."
REFERENCE
"RFC 2963"
::= { qosShapingRateEntry 5 }
--
-- Parameters Section
--
-- The Parameters Section defines parameter objects that can be used for
-- specific attributes defined in the PIB PRCs.
qosTBParameters OBJECT IDENTIFIER ::= { qosPolicyParameters 1 }
qosSchedulerParameters OBJECT IDENTIFIER ::= { qosPolicyParameters 2 }
--
-- Token Bucket Type Parameters
--
qosTBParamSimpleTokenBucket OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of a Two Parameter Token Bucket
as described in [MODEL] section 5.2.3."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 1 }
qosTBParamAvgRate OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of an Average Rate Meter as
described in [MODEL] section 5.2.1."
REFERENCE
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"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 4 }
qosTBParamSrTCMBlind OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of Single Rate Three Color Marker
Metering as defined by RFC 2697, with `Color Blind' mode as
described by the RFC."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 5 }
qosTBParamSrTCMAware OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of Single Rate Three Color Marker
Metering as defined by RFC 2697, with `Color Aware' mode as
described by the RFC."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 6 }
qosTBParamTrTCMBlind OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of Two Rate Three Color Marker
Metering as defined by RFC 2698, with `Color Blind' mode as
described by the RFC."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 7 }
qosTBParamTrTCMAware OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of Two Rate Three Color Marker
Metering as defined by RFC 2698, with `Color Aware' mode as
described by the RFC."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
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::= { qosTBParameters 8 }
qosTBParamTswTCM OBJECT-IDENTITY
STATUS current
DESCRIPTION
"This value indicates the use of Time Sliding Window
Three Color Marker Metering as defined by RFC 2859."
REFERENCE
"[MODEL] sections 5 and 7.1.2"
::= { qosTBParameters 9 }
--
-- Scheduler Method Parameters
--
qosSchedulerPriority OBJECT-IDENTITY
STATUS current
DESCRIPTION
"For use with qosSchedulerMethod and qosIfSchedulingCapsServiceDisc
to indicate Priority scheduling method, defined as an algorithm in
which the presence of data in a queue or set of queues absolutely
precludes dequeue from another queue or set of queues. Notice
attributes from qosAssuredRateEntry of the queues/schedulers feeding
this scheduler are used when determining the next packet to
schedule."
REFERENCE
"[MODEL] section 7.1.2"
::= { qosSchedulerParameters 1 }
qosSchedulerWRR OBJECT-IDENTITY
STATUS current
DESCRIPTION
"For use with qosSchedulerMethod and qosIfSchedulingCapsServiceDisc
to indicate Weighted Round scheduling method, defined as any
algorithm
in which a set of queues are visited in a fixed order, and varying
amounts of traffic are removed from each queue in turn to implement
an
average output rate by class. Notice attributes from
qosAssuredRateEntry of the queues/schedulers feeding this scheduler
are
used when determining the next packet to schedule."
REFERENCE
"[MODEL] section 7.1.2"
::= { qosSchedulerParameters 2 }
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qosSchedulerWFQ OBJECT-IDENTITY
STATUS current
DESCRIPTION
"For use with qosSchedulerMethod and qosIfSchedulingCapsServiceDisc
to indicate Weighted Fair Queueing scheduling method, defined as any
algorithm in which a set of queues are conceptually visited in some
order, to implement an average output rate by class. Notice
attributes from qosAssuredRateEntry of the queues/schedulers feeding
this scheduler are used when determining the next packet to
schedule."
REFERENCE
"[MODEL] section 7.1.2"
::= { qosSchedulerParameters 3 }
--
-- Conformance Section
--
qosPolicyPibConformance
OBJECT IDENTIFIER ::= { qosPolicyPib 3 }
qosPolicyPibCompliances
OBJECT IDENTIFIER ::= { qosPolicyPibConformance 1 }
qosPolicyPibGroups
OBJECT IDENTIFIER ::= { qosPolicyPibConformance 2 }
qosPolicyPibCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"Describes the requirements for conformance to the
QoS Policy PIB."
MODULE -- this module
MANDATORY-GROUPS {
qosPibDataPathGroup,
qosPibClfrGroup,
qosPibClfrElementGroup,
qosPibActionGroup,
qosPibAlgDropGroup,
qosPibQGroup,
qosPibSchedulerGroup,
qosPibAssuredRateGroup,
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qosPibShapingRateGroup }
GROUP qosPibMeterGroup
DESCRIPTION
"This group is mandatory for devices that implement
metering functions."
GROUP qosPibTBParamGroup
DESCRIPTION
"This group is mandatory for devices that implement
token-bucket metering functions."
GROUP qosPibDscpMarkActGroup
DESCRIPTION
"This group is mandatory for devices that implement
DSCP-Marking functions."
GROUP qosPibRandomDropGroup
DESCRIPTION
"This group is mandatory for devices that implement
Random Drop functions."
OBJECT qosClfrId
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosClfrElementClfrId
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosClfrElementPrecedence
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
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OBJECT qosClfrElementNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosClfrElementSpecific
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosMeterSucceedNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosMeterFailNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosMeterSpecific
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosTBParamType
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosTBParamRate
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosTBParamBurstSize
MIN-ACCESS notify
DESCRIPTION
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DiffServ QoS Policy Information Base February 2001
"Install support is not required."
OBJECT qosTBParamInterval
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosActionNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosActionSpecific
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAlgDropType
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAlgDropNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAlgDropQMeasure
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAlgDropQThreshold
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
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OBJECT qosAlgDropSpecific
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropMinThreshBytes
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropMinThreshPkts
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropMaxThreshBytes
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropMaxThreshPkts
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropInvWeight
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropSamplingRate
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosRandomDropProbMax
MIN-ACCESS notify
DESCRIPTION
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"Install support is not required."
OBJECT qosQNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosQWeight
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosQShaper
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosSchedulerMethod
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosSchedulerWeight
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosSchedulerShaper
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosSchedulerNext
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
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OBJECT qosAssuredRatePriority
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAssuredRateAbs
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosAssuredRateRel
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosShapingRateAbs
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosShapingRateRel
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
OBJECT qosShapingRateThreshold
MIN-ACCESS notify
DESCRIPTION
"Install support is not required."
::= { qosPibCompliances 1 }
qosPibDataPathGroup OBJECT-GROUP
OBJECTS {
qosDataPathStart
}
STATUS current
DESCRIPTION
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DiffServ QoS Policy Information Base February 2001
"The Data Path Group defines the PIB Objects that
describe a data path."
::= { qosPibGroups 1 }
qosPibClfrGroup OBJECT-GROUP
OBJECTS {
qosClfrId
}
STATUS current
DESCRIPTION
"The Classifier Group defines the PIB Objects that
describe a generic classifier."
::= { qosPibGroups 2 }
qosPibClfrElementGroup OBJECT-GROUP
OBJECTS {
qosClfrElementClfrId, qosClfrElementOrder,
qosClfrElementNext, qosClfrElementSpecific
}
STATUS current
DESCRIPTION
"The Classifier Group defines the PIB Objects that
describe a generic classifier."
::= { qosPibGroups 3 }
qosPibMeterGroup OBJECT-GROUP
OBJECTS {
qosMeterSucceedNext, qosMeterFailNext,
qosMeterSpecific
}
STATUS current
DESCRIPTION
"The Meter Group defines the objects used in describ-
ing a generic meter element."
::= { qosPibGroups 5 }
qosPibTBParamGroup OBJECT-GROUP
OBJECTS {
qosTBParamType, qosTBParamRate,
qosTBParamBurstSize, qosTBParamInterval
}
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STATUS current
DESCRIPTION
"The Token-Bucket Parameter Group defines the objects
used in describing a single-rate token bucket meter
element."
::= { qosPibGroups 6 }
qosPibActionGroup OBJECT-GROUP
OBJECTS {
qosActionNext, qosActionSpecific
}
STATUS current
DESCRIPTION
"The Action Group defines the objects used in
describing a generic action element."
::= { qosPibGroups 7 }
qosPibDscpMarkActGroup OBJECT-GROUP
OBJECTS {
qosDscpMarkActDscp
}
STATUS current
DESCRIPTION
"The DSCP Mark Action Group defines the objects used
in describing a DSCP Marking Action element."
::= { qosPibGroups 8 }
qosPibAlgDropGroup OBJECT-GROUP
OBJECTS {
qosAlgDropType, qosAlgDropNext,
qosAlgDropQMeasure, qosAlgDropQThreshold,
qosAlgDropSpecific
}
STATUS current
DESCRIPTION
"The Algorithmic Drop Group contains the objects that
describe algorithmic dropper operation and configura-
tion."
::= { qosPibGroups 12 }
qosPibRandomDropGroup OBJECT-GROUP
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DiffServ QoS Policy Information Base February 2001
OBJECTS {
qosRandomDropMinThreshBytes,
qosRandomDropMinThreshPkts,
qosRandomDropMaxThreshBytes,
qosRandomDropMaxThreshPkts,
qosRandomDropProbMax,
qosRandomDropInvWeight,
qosRandomDropSamplingRate
}
STATUS current
DESCRIPTION
"The Random Drop Group augments the Algorithmic Drop Group for
random dropper operation and configuration."
::= { qosPibGroups 13 }
qosPibQGroup OBJECT-GROUP
OBJECTS {
qosQNext, qosQWeight, qosQShaper
}
STATUS current
DESCRIPTION
"The Queue Group contains the objects that describe
an interface's queues."
::= { qosPibGroups 14 }
qosPibSchedulerGroup OBJECT-GROUP
OBJECTS {
qosSchedulerMethod, qosSchedulerWeight,
qosSchedulerShaper, qosSchedulerNext
}
STATUS current
DESCRIPTION
"The Scheduler Group contains the objects that
describe packet schedulers on interfaces."
::= { qosPibGroups 15 }
qosPibAssuredRateGroup OBJECT-GROUP
OBJECTS {
qosAssuredRatePriority,
qosAssuredRateAbs, qosAssuredRateRel
}
STATUS current
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DESCRIPTION
"The Assured Rate Group contains the objects
that describe packet schedulers' parameters on inter-
faces."
::= { qosPibGroups 16 }
qosPibShapingRateGroup OBJECT-GROUP
OBJECTS {
qosShapingRateAbs, qosShapingRateRel,
qosShapingRateThreshold
}
STATUS current
DESCRIPTION
"The Shaping Rate Group contains the objects
that describe packet schedulers' parameters on inter-
faces."
::= { qosPibGroups 17 }
END
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DiffServ QoS Policy Information Base February 2001
9. Subect Category Considerations
The numbering space used for the DiffServ PIB, as indicated by the
SUBJECT-CATEGORIES clause, will be assigned by the Internet Assigned
Numbers Authority (IANA). Notice the numbering space used by SUBJECT-
CATEGORIES maps to the Client Type numbering space in [COPS-PR]. This
relationship is detailed in section 7.1 of [SPPI]. Due to the fact that
Client Type value of 1 has already been used by [COPS-RSVP], the
numbering space for SUBJECT-CATEGORIES will need to start with the value
of 2.
Other PIB Modules may use the same SUBJECT-CATEGORIES as this DiffServ
PIB Module. In such situations, PRC numbering space under a specific
SUBJECT-CATEGORIES should be coordinated with existing PIB Modules using
the same SUBJECT-CATEGORIES.
10. Security Considerations
The information contained in a PIB when transported by the COPS protocol
[COPS-PR] may be sensitive, and its function of provisioning a PEP
requires that only authorized communication take place. The use of
IPSEC between PDP and PEP, as described in [COPS], provides the
necessary protection against these threats.
11. Intellectual Property Considerations
The IETF is being notified of intellectual property rights claimed in
regard to some or all of the specification contained in this document.
For more information consult the online list of claimed rights.
12. Authors' Addresses
Michael Fine
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706 USA
Phone: +1 408 527 8218
Email: mfine@cisco.com
Keith McCloghrie
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DiffServ QoS Policy Information Base February 2001
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706 USA
Phone: +1 408 526 5260
Email: kzm@cisco.com
John Seligson
Nortel Networks, Inc.
4401 Great America Parkway
Santa Clara, CA 95054 USA
Phone: +1 408 495 2992
Email: jseligso@nortelnetworks.com
Kwok Ho Chan
Nortel Networks, Inc.
600 Technology Park Drive
Billerica, MA 01821 USA
Phone: +1 978 288 8175
Email: khchan@nortelnetworks.com
Scott Hahn
Intel
2111 NE 25th Avenue
Hillsboro, OR 97124 USA
Phone: +1 503 264 8231
Email: scott.hahn@intel.com
Carol Bell
Intel
2111 NE 25th Avenue
Hillsboro, OR 97124 USA
Phone: +1 503 264 8491
Email: carol.a.bell@intel.com
Andrew Smith
Allegro Networks
6399 San Ignacio Ave
San Jose, CA 95119
andrew@allegronetworks.com
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Francis Reichmeyer
PFN, Inc.
University Park at MIT
26 Landsdowne Street
Cambridge, MA 02139
Phone: +1 617 494 9980
Email: franr@pfn.com
13. References
[COPS] Boyle, J., Cohen, R., Durham, D., Herzog, S., Rajan, R., and
A. Sastry, "The COPS (Common Open Policy Service) Protocol"
RFC 2748, January 2000.
[COPS-PR] K. Chan, D. Durham, S. Gai, S. Herzog, K. McCloghrie,
F. Reichmeyer, J. Seligson, A. Smith, R. Yavatkar,
"COPS Usage for Policy Provisioning,"
draft-ietf-rap-cops-pr-05.txt, October 2000.
[SPPI] K. McCloghrie, et.al., "Structure of Policy Provisioning
Information," draft-ietf-rap-sppi-03.txt, November 2000.
[DSARCH] M. Carlson, W. Weiss, S. Blake, Z. Wang, D. Black, and
E. Davies, "An Architecture for Differentiated Services",
RFC 2475, December 1998
[DSFIELD] K. Nichols, S. Blake, F. Baker, D. Black, "Definition of the
Differentiated Services Field (DS Field) in the IPv4 and
IPv6 Headers", RFC 2474, December 1998.
[FR-PIB] M. Fine, K. McCloghrie, J. Seligson, K. Chan, S. Hahn,
A. Smith, F. Reichmeyer "Framework Policy Information Base",
Internet Draft <draft-ietf-rap-frameworkpib-03.txt>,
November 2000
[RAP-FRAMEWORK] R. Yavatkar, D. Pendarakis, "A Framework for
Policy-based Admission Control",
RFC 2753, January 2000.
[SNMP-SMI] K. McCloghrie, D. Perkins, J. Schoenwaelder, J. Case,
M. Rose and S. Waldbusser, "Structure of Management Information
Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
[Page 91]
DiffServ QoS Policy Information Base February 2001
[MODEL] Y. Bernet, A. Smith, S. Blake, D. Grossman "A Conceptual Model
for DiffServ Routers", draft-ietf-diffserv-model-04.txt,
July 2000.
[IFMIB] K. McCloghrie, F. Kastenholz, "The Interfaces Group MIB using
SMIv2", RFC 2233, November 1997.
[DS-MIB] F. Baker, K. Chan, A. Smith, "Management Information Base for
the Differentiated Services Architecture",
draft-ietf-diffserv-mib-07.txt, February 2001
[ACTQMGMT] V. Firoiu, M. Borden "A Study of Active Queue Management for
Congestion Control", March 2000, In IEEE Infocom 2000,
http://www.ieee-infocom.org/2000/papers/405.pdf
[AQMROUTER]
V.Misra, W.Gong, D.Towsley "Fuid-based analysis of a network of AQM
routers supporting TCP flows with an application to RED", In
SIGCOMM 2000,
http://www.acm.org/sigcomm/sigcomm2000/conf/paper/sigcomm2000-4-
3.ps.gz
[AF-PHB] J. Heinanen, F. Baker, W. Weiss, J. Wroclawski, "Assured
Forwarding
PHB Group.", RFC 2597, June 1999.
[EF-PHB] V. Jacobson, K. Nichols, K. Poduri, "An Expedited Forwarding
PHB."
RFC 2598, June 1999.
[INETADDRESS] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder,
J.,
"Textual Conventions for Internet Network Addresses.", RFC 2851,
June 2000.
[INTSERVMIB] F. Baker, J. Krawczyk, A. Sastry, "Integrated Services
Management Information Base using SMIv2", RFC 2213, September 1997.
[QUEUEMGMT] B. Braden et al., "Recommendations on Queue Management and
Congestion Avoidance in the Internet", RFC 2309, April 1998.
[RED93] "Random Early Detection", 1993.
[SRTCM] J. Heinanen, R. Guerin, "A Single Rate Three Color Marker", RFC
2697, September 1999.
[Page 92]
DiffServ QoS Policy Information Base February 2001
[TRTCM] J. Heinanen, R. Guerin, "A Two Rate Three Color Marker", RFC
2698,
September 1999.
[TSWTCM] W. Fang, N. Seddigh, B. Nandy "A Time Sliding Window Three
Colour
Marker", RFC 2859, June 2000.
[Page 93]
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Table of Contents
1 Glossary ........................................................ 3
2 Introduction .................................................... 3
3 Relationship to the Diffserv Informal Management Model .......... 3
3.1 PIB Overview .................................................. 4
4 Structure of the PIB ............................................ 6
4.1 General Conventions ........................................... 6
4.2 DiffServ Data Paths ........................................... 6
4.2.1 Data Path PRC ............................................... 7
4.3 Classifiers ................................................... 7
4.3.1 Classifier PRC .............................................. 8
4.3.2 Classifier Element PRC ..................................... 8
4.4 Meters ........................................................ 9
4.4.1 Meter PRC ................................................... 9
4.4.2 Token-Bucket Parameter PRC .................................. 10
4.5 Actions ....................................................... 10
4.5.1 DSCP Mark Action PRC ........................................ 11
4.5.2 Absolute Drop Action ........................................ 11
4.6 Queueing Elements ............................................. 11
4.6.1 Algorithmic Dropper PRC ..................................... 11
4.6.2 Random Dropper PRC .......................................... 12
4.6.3 Queues and Schedulers ....................................... 14
4.7 Specifying Device Capabilities ................................ 16
5 PIB Usage Example ............................................... 17
5.1 Model's Example ............................................... 17
5.2 Additional Data Path Example .................................. 20
5.2.1 Data Path and Classifier Example Discussion ................. 20
5.2.2 Meter and Action Example Discussion ......................... 23
5.2.3 Queue and Scheduler Example Discussion ...................... 23
6 Summary of the DiffServ PIB ..................................... 24
7 PIB Operational Overview ........................................ 25
8 PIB Definitions ................................................. 26
8.1 The DiffServ Base PIB ......................................... 26
9 Subect Category Considerations .................................. 89
10 Security Considerations ........................................ 89
11 Intellectual Property Considerations ........................... 89
12 Authors' Addresses ............................................. 89
13 References ..................................................... 91
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