Network Working Group T. Senevirathne
Internet-Draft N. Finn
Intended status: Standards Track D. Kumar, Ed.
Expires: December 3, 2015 S. Salam
Cisco
Q. Wu, Ed.
M. Wang
Huawei
June 1, 2015
Generic YANG Data Model for Operations, Administration, and Maintenance
(OAM)
draft-tissa-lime-yang-oam-model-05
Abstract
This document presents base YANG Data model for OAM. It provides a
protocol-independent and technology-independent abstraction of key
OAM constructs. Based model presented here can be extended to
include technology specific details. Leading to uniformity between
OAM technologies and support nested OAM workflows (i.e., performing
OAM functions at different layers through a unified interface).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 3, 2015.
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
Senevirathne, et al. Expires December 3, 2015 [Page 1]
Internet-Draft Generic OAM YANG Model June 2015
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 4
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
3. Architecture of Generic YANG Model for OAM . . . . . . . . . 5
4. Overview of the OAM Model . . . . . . . . . . . . . . . . . . 6
4.1. Maintenance Domain (MD) configuration . . . . . . . . . . 7
4.2. Maintenance Association (MA) configuration . . . . . . . 8
4.3. Maintenance Endpoint (MEP) configuration . . . . . . . . 8
4.4. rpc definitions . . . . . . . . . . . . . . . . . . . . . 9
4.5. OAM data hierarchy . . . . . . . . . . . . . . . . . . . 11
5. OAM YANG Module . . . . . . . . . . . . . . . . . . . . . . . 17
6. Base Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.1. MEP Address . . . . . . . . . . . . . . . . . . . . . . . 41
6.2. MEP ID for Base Mode . . . . . . . . . . . . . . . . . . 41
6.3. Maintenance Domain . . . . . . . . . . . . . . . . . . . 41
6.4. Maintenance Association . . . . . . . . . . . . . . . . . 41
7. Note . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8. Security Considerations . . . . . . . . . . . . . . . . . . . 42
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 43
10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 43
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 43
11.1. Normative References . . . . . . . . . . . . . . . . . . 43
11.2. Informative References . . . . . . . . . . . . . . . . . 44
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 45
1. Introduction
Operations, Administration, and Maintenance (OAM) are important
networking functions that allow operators to:
1. Monitor networks (Connectivity Verification, Continuity Check).
2. Troubleshoot failures (Fault verification and isolation).
3. Measure Performance
An overview of OAM tools is presented at [RFC7276].
Senevirathne, et al. Expires December 3, 2015 [Page 2]
Internet-Draft Generic OAM YANG Model June 2015
Ping and Traceroute [RFC792], [RFC4443] are well-known fault
verification and isolation tools, respectively, for IP networks.
Over the years, different technologies have developed similar tools
for similar purposes.
[IEEE802.1Q] Connectivity Fault Management is a well-established OAM
standard that is widely adopted for Ethernet networks. ITU-T
[Y.1731][Y.1731], MEF Service OAM, MPLS-TP [RFC6371], TRILL
[RFC7455][RFC7455] all define OAM methods based on manageability
frame work of [IEEE802.1Q] [IEEE802.1Q]CFM.
Given the wide adoption of the underlying OAM concepts defined in
[IEEE802.1Q][IEEE802.1Q] CFM, it is a reasonable choice to develop
the unified management framework based on those concepts. In this
document, we take the [IEEE802.1Q][IEEE802.1Q] CFM model and extend
it to a technology independent framework and build the corresponding
YANG model accordingly. The YANG model presented in this document is
the base model and supports generic continuity check, connectivity
verification and path discovery. The generic OAM YANG model is
designed such that it can be extended to cover various technologies.
Technology dependent nodes and RPC commands are defined in technology
specific YANG models, which use and extend the base model defined
here. As an example, VXLAN uses source UDP port number for flow
entropy, while MPLS [RFC4379] uses IP addresses or the label stack
for flow entropy in the hashing for multipath selection. To capture
this variation, corresponding YANG models would define the applicable
structures as augmentation to the generic base model presented here.
This accomplishes three purposes: first it keeps each YANG model
smaller and manageable. Second, it allows independent development of
corresponding YANG models. Third, implementations can limit support
to only the applicable set of YANG models. (e.g. TRILL RBridge may
only need to implement Generic OAM model and the TRILL YANG model).
All implementations that follow the YANG framework presented in this
document MUST implement the generic OAM YANG model presented here.
The YANG data model presented in this document occurs at the
management layer. Encapsulations and state machines may differ
according to each OAM protocol. A user who wishes to issues a Ping
command or a Traceroute or initiate a performance monitoring session
can do so in the same manner regardless of the underlying protocol or
technology or specific vendor implementation.
As an example, consider a scenario where an IP ping from device A to
Device B failed. Between device A and B there are IEEE 802.1 bridges
a,b and c. Let's assume a,b and c are using [IEEE802.1Q] CFM. A
user upon detecting the IP layer ping failures may decide to drill
down to the Ethernet layer and issue the corresponding fault
Senevirathne, et al. Expires December 3, 2015 [Page 3]
Internet-Draft Generic OAM YANG Model June 2015
verification (LBM) and fault isolation (LTM) tools, using the same
API. This ability to go up and down to different layers for
troubleshooting is referred to as "nested OAM workflow" and is a
useful concept that leads to efficient network troubleshooting and
maintenance. The OAM YANG model presented in this document
facilitates that without needing changes to the underlying protocols.
2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
In this document, these words will appear with that interpretation
only when in ALL CAPS. Lower case uses of these words are not to be
interpreted as carrying RFC-2119 significance.
2.1. Terminology
CCM Continuity Check Message [IEEE802.1Q].
ECMP
Equal Cost Multipath.
LBM
Loopback Message [IEEE802.1Q].
MP
Maintenance Point [IEEE802.1Q].
MEP
Maintenance End Point [RFC7174] [IEEE802.1Q] [RFC6371].
MIP
Maintenance Intermediate Point [RFC7174] [IEEE802.1Q] [RFC6371].
MA
Maintenance Association [IEEE802.1Q] [RFC7174].
MD
Maintenance Domain [IEEE802.1Q]
Senevirathne, et al. Expires December 3, 2015 [Page 4]
Internet-Draft Generic OAM YANG Model June 2015
MTV
Multi-destination Tree Verification Message.
OAM
Operations, Administration, and Maintenance [RFC6291].
TRILL
Transparent Interconnection of Lots of Links [RFC6325].
3. Architecture of Generic YANG Model for OAM
In this document we define a generic YANG model for OAM. The YANG
model defined here is generic such that other technologies can extend
it for technology specific needs. The Generic OAM YANG model acts as
the root for other OAM YANG models. This allows users to traverse
between OAM of different technologies at ease through a uniform API
set. This is also provides a nested OAM workflow. Figure 1 depicts
the relationship of different OAM YANG models to the Generic OAM YANG
Model. Some technologies may have different sub-technologies. As an
example, consider Network Virtualization Overlays. These could
employ either vXLAN or NVGRE as encapsulation. The Generic OAM YANG
model provides a framework where technology-specific YANG models can
inherit constructs from the base YANG models without needing to
redefine them within the sub-technology.
Figure 1 depicts relationship of different YANG modules.
Senevirathne, et al. Expires December 3, 2015 [Page 5]
Internet-Draft Generic OAM YANG Model June 2015
+-+-+-+-+-+
| gen |
|OAM YANG |
+-+-+-+-+-+
|
O
|
+---------------------------------------------------------+
| | | | |
+-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+
| TRILL | | NVO3 | | MPLS | | IP | . . .| foo |
|OAM YANG | |OAM YANG | |OAM YANG | |OAM YANG | |OAM YANG |
+-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+ +-+-+-+-+-+
| | | | |
| +-+-+-+-+-+ +-+-+-+-+-+ | +-+-+-+-+-+
| | NVO3 | | MPLS | | . . .| foo |
| |sub tech | |sub tech | | |sub tech |
| +-+-+-+-+-+ +-+-+-+-+-+ | +-+-+-+-+-+
| | | | |
| | | | |
+------------------------------------------------------------+
| Uniform API |
+------------------------------------------------------------+
Relationship of OAM YANG model to generic (base) YANG model
4. Overview of the OAM Model
In this document we adopt the concepts of the [IEEE802.1Q] CFM model
and structure it such that it can be adapted to different
technologies.
At the top of the Model is the Maintenance Domain. Each Maintenance
Domain is associated with a Maintenance Name and a Domain Level.
Under each Maintenance Domain there is one or more Maintenance
Association (MA). In IP, the MA can be per IP Subnet, in NVO3 this
can be per VNI and for TRILL this can be per Fine-Grained Label or
for VPLS this can be per VPLS instance.
Under each MA, there can be two or more MEPs (Maintenance End
Points). MEPs are addressed by their respective technology specific
address identifiers. The YANG model presented here provides
flexibility to accommodate different addressing schemes.
In a parallel vertical, presented are the commands. Those, in YANG
terms, are the rpc commands. These rpc commands provide uniform APIs
Senevirathne, et al. Expires December 3, 2015 [Page 6]
Internet-Draft Generic OAM YANG Model June 2015
for continuity check,connectivity verification, path discovery and
their equivalents as well as other OAM commands.
[IEEE802.1Q] CFM framework requires explicit configuration of OAM
entities prior to using any of the OAM tools. Users of Ping and
Traceroute tools within IP devices are expecting ability to use OAM
tools with no explicit configuration. In order to facilitate zero-
touch experience, this document defines a default mode of OAM. The
default mode of OAM is referred to as the Base Mode and specifies
default values for each of the [IEEE802.1Q] CFM parameters, such as
Maintenance Domain Level, Name of the Maintenance Association and
Addresses of MEP and so on. The default values of these depend on
the technology. Base Mode for TRILL is defined in [RFC7455]. Base
mode for other technologies such as NVO3, MPLS and future extensions
will be defined in their corresponding documents.
It is important to note that, no specific enhancements are needed in
the YANG model to support Base Mode. Implementations that comply
with this document, by default implement the data nodes of the
applicable technology. Data nodes of the Base Mode are read-only
nodes.
4.1. Maintenance Domain (MD) configuration
The container "domains" is the top level container within the gen-oam
module. Within the container "domains", separate list is maintained
per MD. The MD list uses the key MD-name-string for indexing. MD-
name-string is a leaf and derived from type string. Additional name
formats as defined in [IEEE802.1Q] or other standards can be included
by association of the MD-name-format with an identity-ref. MD-name-
format indicates the format of the augmented MD-names. MD-name is
presented as choice/case construct. Thus, it is easily augmentable
by derivative work.
module: ietf-gen-oam
+--rw domains
+--rw domain* [technology MD-name-string]
+--rw technology identityref
+--rw MD-name-string MD-name-string
+--rw MD-name-format? identityref
+--rw (MD-name)?
| +--:(MD-name-null)
| +--rw MD-name-null? empty
+--rw md-level MD-level .
Snippet of data hierarchy related to OAM domains
Senevirathne, et al. Expires December 3, 2015 [Page 7]
Internet-Draft Generic OAM YANG Model June 2015
4.2. Maintenance Association (MA) configuration
Within a given Maintenance Domain there can be one or more
Maintenance Associations (MA). MAs are represented as a list and
indexed by the MA-name-string. Similar to MD-name defined
previously, additional name formats can be added by augmenting the
name-format identity-ref and adding applicable case statements to MA-
name.
module: ietf-gen-oam
+--rw domains
+--rw domain* [technology MD-name-string]
.
.
+--rw MAs
+--rw MA* [MA-name-string]
+--rw MA-name-string MA-name-string
+--rw MA-name-format? identityref
+--rw (MA-name)?
| +--:(MA-name-null)
| +--rw MA-name-null? empty
Snippet of data hierarchy related to Maintenance Associations (MA)
4.3. Maintenance Endpoint (MEP) configuration
Within a given Maintenance Association (MA), there can be one or more
Maintenance End Points (MEP). MEPs are represented as a list within
the data hierarchy and indexed by the key MEP-name.
Senevirathne, et al. Expires December 3, 2015 [Page 8]
Internet-Draft Generic OAM YANG Model June 2015
module: ietf-gen-oam
+--rw domains
+--rw domain* [technology MD-name-string]
+--rw technology identityref
.
.
+--rw MAs
+--rw MA* [MA-name-string]
+--rw MA-name-string MA-name-string
.
.
+--rw MEP* [mep-name]
| +--rw mep-name MEP-name
| +--rw (MEP-ID)?
| | +--:(MEP-ID-int)
| | +--rw MEP-ID-int? int32
| | +--:(MEP-ID-tlv)
| | +--rw MEP-ID-type? int16
| | +--rw MEP-ID-len? int16
| | +--rw MEP-ID-value? binary
| +--rw MEP-ID-format? identityref
| +--rw (mp-address)?
| | +--:(mac-address)
| | | +--rw mac-address? yang:mac-address
| | +--:(ipv4-address)
| | | +--rw ipv4-address? inet:ipv4-address
| | +--:(ipv6-address)
| | +--rw ipv6-address? inet:ipv6-address
. .
. .
. .
Snippet of data hierarchy related to Maintenance Endpoint (MEP)
4.4. rpc definitions
The rpc model facilitates issuing commands to a NETCONF server (in
this case to the device that need to execute the OAM command) and
obtain a response. rpc model defined here abstracts OAM specific
commands in a technology independent manner.
There are several rpc commands defined for the purpose of OAM. In
this section we present a snippet of the ping command for
illustration purposes. Please refer to Section 4 for the complete
data hierarchy and Section 5 for the YANG model.
Senevirathne, et al. Expires December 3, 2015 [Page 9]
Internet-Draft Generic OAM YANG Model June 2015
module: ietf-gen-oam
+--rw domains
+--rw domain* [technology MD-name-string]
+--rw technology identityref
.
.
rpcs:
+---x continuity-check
| +--ro input
| | +--ro technology identityref
| | +--ro MD-name-string MD-name-string
| | +--ro MA-name-string? MA-name-string
| | +--ro (flow-entropy)?
| | | +--:(flow-entropy-null)
| | | +--ro flow-entropy-null? empty
| | +--ro priority? uint8
| | +--ro ttl? uint8
| | +--ro session-type enumeration
| | +--ro ecmp-choice? ecmp-choices
| | +--ro sub-type? identityref
| | +--ro outgoing-interfaces* [interface]
| | | +--ro interface if:interface-ref
| | +--ro source-mep? MEP-name
| | +--ro destination-mp
| | | +--ro (mp-address)?
| | | | +--:(mac-address)
| | | | | +--ro mac-address? yang:mac-address
| | | | +--:(ipv4-address)
| | | | | +--ro ipv4-address? inet:ipv4-address
| | | | +--:(ipv6-address)
| | | | +--ro ipv6-address? inet:ipv6-address
| | | +--ro (MEP-ID)?
| | | | +--:(MEP-ID-int)
| | | | +--ro MEP-ID-int? int32
| | | +--ro MEP-ID-format? identityref
| | +--ro count? uint32
| | +--ro interval? Interval
| | +--ro packet-size? uint32
| +--ro output
| +--ro tx-packt-count? oam-counter32
| +--ro rx-packet-count? oam-counter32
| +--ro min-delay? oam-counter32
| +--ro average-delay? oam-counter32
| +--ro max-delay? oam-counter32
Snippet of data hierarchy related to rpc call continuity-check
Senevirathne, et al. Expires December 3, 2015 [Page 10]
Internet-Draft Generic OAM YANG Model June 2015
4.5. OAM data hierarchy
The complete data hierarchy related to the OAM YANG model is
presented below. The following notations are used within the data
tree and carry the meaning as below.
Each node is printed as:
<status> <flags> <name> <opts> <type>
<status> is one of:
+ for current
x for deprecated
o for obsolete
<flags> is one of:
rw for configuration data
ro for non-configuration data
-x for rpcs
-n for notifications
<name> is the name of the node
If the node is augmented into the tree from another module, its name
is printed as <prefix>:<name>.
<opts> is one of:
? for an optional leaf or choice
! for a presence container
* for a leaf-list or list
[<keys>] for a list's keys
<type> is the name of the type for leafs and leaf-lists
module: ietf-gen-oam
+--rw domains
+--rw domain* [technology MD-name-string]
+--rw technology identityref
+--rw MD-name-string MD-name-string
+--rw MD-name-format? identityref
+--rw (MD-name)?
| +--:(MD-name-null)
| +--rw MD-name-null? empty
+--rw md-level? MD-level
Senevirathne, et al. Expires December 3, 2015 [Page 11]
Internet-Draft Generic OAM YANG Model June 2015
+--rw MAs
+--rw MA* [MA-name-string]
+--rw MA-name-string MA-name-string
+--rw MA-name-format? identityref
+--rw (MA-name)?
| +--:(MA-name-null)
| +--rw MA-name-null? empty
+--rw (connectivity-context)?
| +--:(context-null)
| +--rw context-null? empty
+--rw mep-direction MEP-direction
+--rw interval? Interval
+--rw loss-threshold? uint32
+--rw ttl? uint8
+--rw (flow-entropy)?
| +--:(flow-entropy-null)
| +--rw flow-entropy-null? empty
+--rw priority? uint8
+--rw MEP* [mep-name]
| +--rw mep-name MEP-name
| +--rw (MEP-ID)?
| | +--:(MEP-ID-int)
| | | +--rw MEP-ID-int? int32
| | +--:(MEP-ID-tlv)
| | +--rw MEP-ID-type? int16
| | +--rw MEP-ID-len? int16
| | +--rw MEP-ID-value? binary
| +--rw MEP-ID-format? identityref
| +--rw (mp-address)?
| | +--:(mac-address)
| | | +--rw mac-address? yang:mac-address
| | +--:(ipv4-address)
| | | +--rw ipv4-address? inet:ipv4-address
| | +--:(ipv6-address)
| | +--rw ipv6-address? inet:ipv6-address
| +--rw (connectivity-context)?
| | +--:(context-null)
| | +--rw context-null? empty
| +--rw Interface? if:interface-ref
| +--rw (topology)?
| | +--:(topo-null)
| | +--rw topo-null? empty
| +--ro admin-status? leafref
| +--ro oper-status? leafref
| +--rw (flow-entropy)?
| | +--:(flow-entropy-null)
| | +--rw flow-entropy-null? empty
| +--rw priority? uint8
Senevirathne, et al. Expires December 3, 2015 [Page 12]
Internet-Draft Generic OAM YANG Model June 2015
| +--rw session* [session-cookie]
| +--rw session-cookie uint32
| +--rw ttl? uint8
| +--rw interval? Interval
| +--rw enable? boolean
| +--rw ecmp-choice? ecmp-choices
| +--rw source-mep? MEP-name
| +--rw destination-mep
| | +--rw (MEP-ID)?
| | | +--:(MEP-ID-int)
| | | | +--rw MEP-ID-int? int32
| | | +--:(MEP-ID-tlv)
| | | +--rw MEP-ID-type? int16
| | | +--rw MEP-ID-len? int16
| | | +--rw MEP-ID-value? binary
| | +--rw MEP-ID-format? identityref
| +--rw destination-mep-address
| | +--rw (mp-address)?
| | +--:(mac-address)
| | | +--rw mac-address? yang:mac-address
| | +--:(ipv4-address)
| | | +--rw ipv4-address? inet:ipv4-address
| | +--:(ipv6-address)
| | +--rw ipv6-address? inet:ipv6-address
| +--rw (connectivity-context)?
| | +--:(context-null)
| | +--rw context-null? empty
| +--rw (flow-entropy)?
| | +--:(flow-entropy-null)
| | +--rw flow-entropy-null? empty
| +--rw priority? uint8
| +--rw outgoing-interface* [interface]
| +--rw interface leafref
+--rw MIP* [interface]
| +--rw interface if:interface-ref
+--rw related-oam-layer* [offset]
+--rw offset int32
+--rw technology identityref
+--rw MD-name-string MD-name-string
+--rw MA-name-string? MA-name-string
rpcs:
+---x continuity-check
| +--ro input
| | +--ro technology identityref
| | +--ro MD-name-string MD-name-string
| | +--ro MA-name-string? MA-name-string
| | +--ro (flow-entropy)?
| | | +--:(flow-entropy-null)
Senevirathne, et al. Expires December 3, 2015 [Page 13]
Internet-Draft Generic OAM YANG Model June 2015
| | | +--ro flow-entropy-null? empty
| | +--ro priority? uint8
| | +--ro ttl? uint8
| | +--ro session-type-enum? enumeration
| | +--ro ecmp-choice? ecmp-choices
| | +--ro sub-type? identityref
| | +--ro outgoing-interfaces* [interface]
| | | +--ro interface if:interface-ref
| | +--ro source-mep? MEP-name
| | +--ro destination-mp
| | | +--ro (mp-address)?
| | | | +--:(mac-address)
| | | | | +--ro mac-address? yang:mac-address
| | | | +--:(ipv4-address)
| | | | | +--ro ipv4-address? inet:ipv4-address
| | | | +--:(ipv6-address)
| | | | +--ro ipv6-address? inet:ipv6-address
| | | +--ro (MEP-ID)?
| | | | +--:(MEP-ID-int)
| | | | | +--ro MEP-ID-int? int32
| | | | +--:(MEP-ID-tlv)
| | | | +--ro MEP-ID-type? int16
| | | | +--ro MEP-ID-len? int16
| | | | +--ro MEP-ID-value? binary
| | | +--ro MEP-ID-format? identityref
| | +--ro count? uint32
| | +--ro interval? Interval
| | +--ro packet-size? uint32
| +--ro output
| +--ro tx-packt-count? oam-counter32
| +--ro rx-packet-count? oam-counter32
| +--ro min-delay? oam-counter32
| +--ro average-delay? oam-counter32
| +--ro max-delay? oam-counter32
+---x continuity-verification {connectivity-verification}?
| +--ro input
| | +--ro technology identityref
| | +--ro MD-name-string MD-name-string
| | +--ro MA-name-string? MA-name-string
| | +--ro (flow-entropy)?
| | | +--:(flow-entropy-null)
| | | +--ro flow-entropy-null? empty
| | +--ro priority? uint8
| | +--ro ttl? uint8
| | +--ro session-type-enum? enumeration
| | +--ro ecmp-choice? ecmp-choices
| | +--ro sub-type? identityref
| | +--ro outgoing-interfaces* [interface]
Senevirathne, et al. Expires December 3, 2015 [Page 14]
Internet-Draft Generic OAM YANG Model June 2015
| | | +--ro interface if:interface-ref
| | +--ro source-mep? MEP-name
| | +--ro destination-mp
| | | +--ro (mp-address)?
| | | | +--:(mac-address)
| | | | | +--ro mac-address? yang:mac-address
| | | | +--:(ipv4-address)
| | | | | +--ro ipv4-address? inet:ipv4-address
| | | | +--:(ipv6-address)
| | | | +--ro ipv6-address? inet:ipv6-address
| | | +--ro (MEP-ID)?
| | | | +--:(MEP-ID-int)
| | | | | +--ro MEP-ID-int? int32
| | | | +--:(MEP-ID-tlv)
| | | | +--ro MEP-ID-type? int16
| | | | +--ro MEP-ID-len? int16
| | | | +--ro MEP-ID-value? binary
| | | +--ro MEP-ID-format? identityref
| | +--ro count? uint32
| | +--ro interval? Interval
| | +--ro packet-size? uint32
| +--ro output
| +--ro tx-packt-count? oam-counter32
| +--ro rx-packet-count? oam-counter32
| +--ro min-delay? oam-counter32
| +--ro average-delay? oam-counter32
| +--ro max-delay? oam-counter32
+---x path-discovery
+--ro input
| +--ro technology identityref
| +--ro MD-name-string MD-name-string
| +--ro MA-name-string? MA-name-string
| +--ro (flow-entropy)?
| | +--:(flow-entropy-null)
| | +--ro flow-entropy-null? empty
| +--ro priority? uint8
| +--ro ttl? uint8
| +--ro session-type-enum? enumeration
| +--ro command-sub-type? identityref
| +--ro ecmp-choice? ecmp-choices
| +--ro outgoing-interfaces* [interface]
| | +--ro interface if:interface-ref
| +--ro source-mep? MEP-name
| +--ro destination-mp
| | +--ro (mp-address)?
| | | +--:(mac-address)
| | | | +--ro mac-address? yang:mac-address
| | | +--:(ipv4-address)
Senevirathne, et al. Expires December 3, 2015 [Page 15]
Internet-Draft Generic OAM YANG Model June 2015
| | | | +--ro ipv4-address? inet:ipv4-address
| | | +--:(ipv6-address)
| | | +--ro ipv6-address? inet:ipv6-address
| | +--ro (MEP-ID)?
| | | +--:(MEP-ID-int)
| | | | +--ro MEP-ID-int? int32
| | | +--:(MEP-ID-tlv)
| | | +--ro MEP-ID-type? int16
| | | +--ro MEP-ID-len? int16
| | | +--ro MEP-ID-value? binary
| | +--ro MEP-ID-format? identityref
| +--ro count? uint32
| +--ro interval? Interval
+--ro output
+--ro response* [response-index]
+--ro response-index uint8
+--ro ttl? uint8
+--ro destination-mp
| +--ro (mp-address)?
| | +--:(mac-address)
| | | +--ro mac-address? yang:mac-address
| | +--:(ipv4-address)
| | | +--ro ipv4-address? inet:ipv4-address
| | +--:(ipv6-address)
| | +--ro ipv6-address? inet:ipv6-address
| +--ro (MEP-ID)?
| | +--:(MEP-ID-int)
| | | +--ro MEP-ID-int? int32
| | +--:(MEP-ID-tlv)
| | +--ro MEP-ID-type? int16
| | +--ro MEP-ID-len? int16
| | +--ro MEP-ID-value? binary
| +--ro MEP-ID-format? identityref
+--ro tx-packt-count? oam-counter32
+--ro rx-packet-count? oam-counter32
+--ro min-delay? oam-counter32
+--ro average-delay? oam-counter32
+--ro max-delay? oam-counter32
notifications:
+---n defect-condition-notification
+--ro technology identityref
+--ro MD-name-string MD-name-string
+--ro MA-name-string? MA-name-string
+--ro mep-name? MEP-name
+--ro defect-type? identityref
+--ro generating-mepid
| +--ro (MEP-ID)?
| | +--:(MEP-ID-int)
Senevirathne, et al. Expires December 3, 2015 [Page 16]
Internet-Draft Generic OAM YANG Model June 2015
| | | +--ro MEP-ID-int? int32
| | +--:(MEP-ID-tlv)
| | +--ro MEP-ID-type? int16
| | +--ro MEP-ID-len? int16
| | +--ro MEP-ID-value? binary
| +--ro MEP-ID-format? identityref
+--ro (error)?
+--:(error-null)
| +--ro error-null? empty
+--:(error-code)
+--ro error-code? int3
+--ro error-code? int32
data hierarchy of OAM
5. OAM YANG Module
<CODE BEGINS> file "ietf-gen-oam.yang"
module ietf-gen-oam {
namespace "urn:ietf:params:xml:ns:yang:ietf-gen-oam";
prefix goam;
import ietf-interfaces {
prefix if;
}
import ietf-yang-types {
prefix yang;
}
import ietf-inet-types {
prefix inet;
}
organization "IETF LIME Working Group";
contact
"Tissa Senevirathne tsenevir@cisco.com";
description
"This YANG module defines the generic configuration,
statistics and rpc for OAM to be used within IETF in
a protocol indpendent manner. Functional level
abstraction is indendent with YANG modeling. It is
assumed that each protocol maps corresponding
abstracts to its native format.
Each protocol may extend the YANG model defined
here to include protocol specific extensions";
revision 2015-04-09 {
Senevirathne, et al. Expires December 3, 2015 [Page 17]
Internet-Draft Generic OAM YANG Model June 2015
description
"Initial revision. - 04 version";
reference "draft-tissa-lime-oam";
}
/* features */
feature connectivity-verification {
description
"This feature indicates that the server supports
executing connectivity verification OAM command and
returning a response. Servers that do not advertise
this feature will not support executing
connectivity verification command or rpc model for
connectivity verification command.";
}
/* Identities */
identity technology-types {
description
"this is the base identy of technology types which are
vpls, nvo3, TRILL, ipv4, ipv6, mpls, etc";
}
identity ipv4 {
base technology-types;
description
"technology of ipv4";
}
identity ipv6 {
base technology-types;
description
"technology of ipv6";
}
identity command-sub-type {
description
"defines different rpc command subtypes, e.g rfc792 IP
ping, rfc4379 LSP ping, rfc6905 trill OAM, this is
optional for most cases";
}
identity icmp-rfc792 {
base command-sub-type;
description
"Defines the command subtypes for ICMP ping";
Senevirathne, et al. Expires December 3, 2015 [Page 18]
Internet-Draft Generic OAM YANG Model June 2015
reference "RFC 792";
}
identity name-format {
description
"This defines the name format, IEEE 8021Q CFM defines varying
styles of names. It is expected name format as an identity ref
to be extended with new types.";
}
identity name-format-null {
base name-format;
description
"defines name format as null";
}
identity identifier-format {
description
"identifier-format identity can be augmented to define other
format identifiers used in MEPD-ID etc";
}
identity identifier-format-integer {
base identifier-format;
description
"defines identifier-format to be integer";
}
identity defect-types {
description
"defines different defect types, e.g. remote rdi,
mis-connection defect, loss of continuity";
}
/* typedefs */
typedef MEP-direction {
type enumeration {
enum "Up" {
value 0;
description
"UP direction.";
}
enum "Down" {
value 1;
description
"Down direction.";
}
Senevirathne, et al. Expires December 3, 2015 [Page 19]
Internet-Draft Generic OAM YANG Model June 2015
}
description
"MEP direction.";
}
typedef MEP-name {
type string;
description
"Generic administrative name for a MEP";
}
typedef Interval {
type uint32;
units "milliseconds";
default "1000";
description
"Interval between packets in milliseconds.
0 means no packets are sent.";
}
typedef ecmp-choices {
type enumeration {
enum "ecmp-use-platform-hash" {
value 0;
description
"Use Platform hashing.";
}
enum "ecmp-use-round-robin" {
value 1;
description
"Use round robin hashing.";
}
}
description
"Equal cost multi Path Choices";
}
typedef MD-name-string {
type string;
default "";
description
"Generic administrative name for an MD";
}
typedef MA-name-string {
type string;
default "";
description
Senevirathne, et al. Expires December 3, 2015 [Page 20]
Internet-Draft Generic OAM YANG Model June 2015
"Generic administrative name for an MA";
}
typedef oam-counter32 {
type yang:zero-based-counter32;
description
"defines 32 bit counter for OAM";
}
typedef MD-level {
type uint32 {
range "0..255";
}
description
"Maintenance Domain level. The level may be restricted in
certain protocols (eg to 0-7)";
}
/* groupings */
grouping topology {
choice topology {
case topo-null {
description
"this is a placeholder when no topology is needed";
leaf topo-null {
type empty;
description
"there is no topology define, it will be defined
in technology specific model.";
}
}
description
"Topology choices";
}
description
"Topology";
}
grouping error-message {
choice error {
case error-null {
description
"this is a placeholder when no error status is needed";
leaf error-null {
type empty;
description
"there is no error define, it will be defined in
Senevirathne, et al. Expires December 3, 2015 [Page 21]
Internet-Draft Generic OAM YANG Model June 2015
technology specific model.";
}
}
case error-code {
description
"this is a placeholder to display error code.";
leaf error-code {
type int32;
description
"error code is integer value specific to technology.";
}
}
description
"Error Message choices.";
}
description
"Error Message.";
}
grouping mp-address {
choice mp-address {
case mac-address {
leaf mac-address {
type yang:mac-address;
description
"MAC Address";
}
description
"MAC Address based MP Addressing.";
}
case ipv4-address {
leaf ipv4-address {
type inet:ipv4-address;
description
"Ipv4 Address";
}
description
"Ip Address based MP Addressing.";
}
case ipv6-address {
leaf ipv6-address {
type inet:ipv6-address;
description
"Ipv6 Address";
}
description
"ipv6 Address based MP Addressing.";
}
Senevirathne, et al. Expires December 3, 2015 [Page 22]
Internet-Draft Generic OAM YANG Model June 2015
description
"MP Addressing.";
}
description
"MP Address";
}
grouping maintenance-domain-id {
description
"Grouping containing leaves sufficient to identify an MD";
leaf technology {
type identityref {
base technology-types;
}
mandatory true;
description
"Defines the technology";
}
leaf MD-name-string {
type MD-name-string;
mandatory true;
description
"Defines the generic administrative maintenance domain name";
}
}
grouping MD-name {
leaf MD-name-format {
type identityref {
base name-format;
}
description
"Name format.";
}
choice MD-name {
case MD-name-null {
leaf MD-name-null {
when "../../../MD-name-format = name-format-null" {
description
"MD name format is equal to null format.";
}
type empty;
description
"MD name Null.";
}
}
description
Senevirathne, et al. Expires December 3, 2015 [Page 23]
Internet-Draft Generic OAM YANG Model June 2015
"MD name.";
}
description
"MD name";
}
grouping ma-identifier {
description
"Grouping containing leaves sufficient to identify an MA";
leaf MA-name-string {
type MA-name-string;
description
"MA name string.";
}
}
grouping MA-name {
description
"MA name";
leaf MA-name-format {
type identityref {
base name-format;
}
description
"Ma name format";
}
choice MA-name {
case MA-name-null {
leaf MA-name-null {
when "../../../MA-name-format = name-format-null" {
description
"MA";
}
type empty;
description
"empty";
}
}
description
"MA name";
}
}
grouping MEP-ID {
choice MEP-ID {
default "MEP-ID-int";
case MEP-ID-int {
leaf MEP-ID-int {
Senevirathne, et al. Expires December 3, 2015 [Page 24]
Internet-Draft Generic OAM YANG Model June 2015
type int32;
description
"MEP ID in integer format";
}
}
case MEP-ID-tlv {
leaf MEP-ID-type {
type int16;
description
"Type of MEP-ID";
}
leaf MEP-ID-len {
type int16;
description
"Length of MEP-ID value";
}
leaf MEP-ID-value {
type binary {
length "12..255";
}
description
"Value please refer RFC6428.";
}
}
description
"MEP-ID";
}
leaf MEP-ID-format {
type identityref {
base identifier-format;
}
description
"MEP ID format.";
}
description
"MEP-ID";
}
grouping MEP {
description
"Defines elements within the MEP";
leaf mep-name {
type MEP-name;
mandatory true;
description
"Generic administrative name of the MEP";
}
uses MEP-ID;
Senevirathne, et al. Expires December 3, 2015 [Page 25]
Internet-Draft Generic OAM YANG Model June 2015
uses mp-address;
uses connectivity-context;
leaf Interface {
type if:interface-ref;
description
"Interface name as defined by ietf-interfaces";
}
uses topology;
}
grouping session-type {
description
"This object indicates the current session
definition.";
leaf session-type-enum {
type enumeration {
enum proactive {
description
"The current session is proactive";
}
enum on-demand {
description
"The current session is on-demand.";
}
}
description
"session type enum";
}
}
grouping monitor-stats {
leaf tx-packt-count {
type oam-counter32;
description
"Transmitted Packet count";
}
leaf rx-packet-count {
type oam-counter32;
description
"Received packet count";
}
leaf min-delay {
type oam-counter32;
units milliseconds;
description
"Delay is specified in milliseconds";
}
leaf average-delay {
Senevirathne, et al. Expires December 3, 2015 [Page 26]
Internet-Draft Generic OAM YANG Model June 2015
type oam-counter32;
units millisecond;
description
"average delay in milliseconds";
}
leaf max-delay {
type oam-counter32;
units millisecond;
description
"Maximum delay in milliseconds";
}
description
"Monitor Statistics";
}
grouping MIP {
description
"defines MIP";
leaf interface {
type if:interface-ref;
description
"Interface";
}
}
grouping related-oam-layer {
leaf offset {
type int32 {
range "-255..255";
}
description
"defines offset (in MD levels) to a related OAM layer
+1 is the layer immediately above
-1 is the layer immediately below";
}
uses maintenance-domain-id;
uses ma-identifier;
description
"related OAM layer";
}
grouping interface-status {
description
"collection of interface related status";
leaf admin-status {
type leafref {
path "/if:interfaces-state/if:interface/if:admin-status";
}
Senevirathne, et al. Expires December 3, 2015 [Page 27]
Internet-Draft Generic OAM YANG Model June 2015
config false;
description
"oper status from ietf-interface module";
}
leaf oper-status {
type leafref {
path "/if:interfaces-state/if:interface/if:oper-status";
}
config false;
description
"oper status from ietf-interface module";
}
}
grouping connectivity-context {
description
"Grouping defining the connectivity context for an MA; for
example, a VRF for IP, or an LSP for MPLS. This will be
augmented by each protocol who use this component";
choice connectivity-context {
default "context-null";
case context-null {
description
"this is a place holder when no context is needed";
leaf context-null {
type empty;
description
"there is no context define";
}
}
description
"connectivity context";
}
}
grouping priority {
description
"Priority used in transmitted packets; for example, in the
TOS/DSCP field in IP or the Traffic Class field in MPLS";
leaf priority {
type uint8;
description
"priority";
}
}
grouping flow-entropy {
description
Senevirathne, et al. Expires December 3, 2015 [Page 28]
Internet-Draft Generic OAM YANG Model June 2015
"defines the grouping statement for flow-entropy";
choice flow-entropy {
default "flow-entropy-null";
case flow-entropy-null {
description
"this is a place holder when no flow entropy is needed";
leaf flow-entropy-null {
type empty;
description
"there is no flow entropy defined";
}
}
description
"Flow entropy";
}
}
grouping measurement-timing-group {
description
"This grouping includes objects used for
proactive and on-demand
scheduling of PM measurement sessions.";
container start-time {
description
"This container defines the session start time.";
choice start-time {
description
"Measurement sessions tart time can be immediate, relative, or
absolute.";
container immediate {
presence "Start the measurement session immediately.";
description
"Start Time of probe immediately.";
}
leaf absolute {
type yang:date-and-time;
description
"This objects specifies the scheduled start time
to perform the on-demand monitoring operations.";
}
}
}
container stop-time {
description
"This container defines the session stop time.";
choice stop-time {
Senevirathne, et al. Expires December 3, 2015 [Page 29]
Internet-Draft Generic OAM YANG Model June 2015
description
"Measurement session stop time can be none, or absolute.";
container none {
presence "Never end the measurement session.";
description
"Stop time is never to end.";
}
leaf absolute {
type yang:date-and-time;
description
"This objects specifies the scheduled stop time
to perform the on-demand monitoring operations.";
}
}
}
}
container domains {
description
"Contains configuration related data. Within the container
is list of fault domains. Wihin each domian has List of MA.";
list domain {
key "technology MD-name-string";
ordered-by system;
description
"Define the list of Domains within the IETF-OAM";
uses maintenance-domain-id;
uses MD-name;
leaf md-level {
type MD-level;
description
"Defines the MD-Level";
}
container MAs {
description
"This container defines MA, within that have multiple MA
and within MA have MEP, MIP";
list MA {
key "MA-name-string";
ordered-by system;
uses ma-identifier;
uses MA-name;
uses connectivity-context;
leaf mep-direction {
type MEP-direction;
mandatory true;
Senevirathne, et al. Expires December 3, 2015 [Page 30]
Internet-Draft Generic OAM YANG Model June 2015
description
"Direction for MEPs in this MA";
}
leaf interval {
type Interval;
default "0";
description
"Defines default Keepalive/CC Interval. May be
overridden for specific sessions if supported by the
protocol.";
}
leaf loss-threshold {
type uint32;
default "3";
description
"number of consecutive Keepalive/CC messages missed
before declaring loss of continuity fault. This is
monitored per each remote MEP session";
}
leaf ttl {
type uint8;
default "255";
description
"Time to Live";
}
uses flow-entropy {
description
"Default flow entropy in this MA, which may be
overridden for particular MEPs, sessions or
operations";
}
uses priority {
description
"Default priority for this MA, which may be overridden
for particular MEPs, sessions or operations.";
}
list MEP {
key "mep-name";
ordered-by system;
description
"contain list of MEPS";
uses MEP;
uses interface-status {
description
"status of associated interface";
}
uses flow-entropy;
uses priority;
Senevirathne, et al. Expires December 3, 2015 [Page 31]
Internet-Draft Generic OAM YANG Model June 2015
list session {
key "session-cookie";
ordered-by user;
description
"Monitoring session to/from a particular remote MEP.
Depending on the protocol, this could represent CC
messages received from a single remote MEP (if the
protocol uses multicast CCs) or a target to which
unicast echo request CCs are sent and from which
responses are received (if the protocol uses a
unicast request/response mechanism).";
leaf session-cookie {
type uint32;
description
"Cookie to identify different sessions, when there
are multiple remote MEPs or multiple sessions to
the same remote MEP.";
}
leaf ttl {
type uint8;
default "255";
description
"Time to Live.";
}
leaf interval {
type Interval;
description
"Transmission interval for CC packets for this
session.";
}
leaf enable {
type boolean;
default "false";
description
"enable or disable a monitor session";
}
leaf ecmp-choice {
type ecmp-choices;
description
"0 means use the specified interface
1 means use round robin";
}
leaf source-mep {
type MEP-name;
description
"Source MEP for this session, if applicable";
}
container destination-mep {
Senevirathne, et al. Expires December 3, 2015 [Page 32]
Internet-Draft Generic OAM YANG Model June 2015
uses MEP-ID;
description
"Destination MEP";
}
container destination-mep-address {
uses mp-address;
description
"Destination MEP Address";
}
uses connectivity-context;
uses flow-entropy;
uses priority;
list outgoing-interface {
key "interface";
leaf interface {
type leafref {
path "/if:interfaces/if:interface/if:name";
}
description
"Outgoing Interface";
}
description
"outgoing interfaces";
}
}
}
list MIP {
key "interface";
uses MIP;
description
"Maintenance Intermediate Point";
}
list related-oam-layer {
key "offset";
description
"List of OAM layers above and below that are related to
current MA. This allow users to easily navigate up and
down to efficiently troubleshoot a connectivity
issue";
uses related-oam-layer;
}
description
"Maintenance Association list";
}
}
}
}
Senevirathne, et al. Expires December 3, 2015 [Page 33]
Internet-Draft Generic OAM YANG Model June 2015
notification defect-condition-notification {
description
"When defect condition is met this notificiation is sent";
uses maintenance-domain-id {
description
"defines the MD (Maintenance Domain) identifier, which is the
Generic MD-name-string and the technology.";
}
uses ma-identifier;
leaf mep-name {
type MEP-name;
description
"Indicate which MEP is seeing the error";
}
leaf defect-type {
type identityref {
base defect-types;
}
description
"The currently active defects on the specific MEP.";
}
container generating-mepid {
uses MEP-ID;
description
"Who is generating the error (if known) if
unknown make it 0.";
}
uses error-message {
description
"Error message to indicate more details.";
}
}
rpc continuity-check {
description
"Generates continuity-check as per RFC7276 Table 4.";
input {
uses maintenance-domain-id {
description
"defines the MD (Maintenance Domain) identifier, which is
the generic
MD-name-string and the technology.";
}
uses ma-identifier {
description
"identfies the Maintenance association";
}
uses flow-entropy;
uses priority;
Senevirathne, et al. Expires December 3, 2015 [Page 34]
Internet-Draft Generic OAM YANG Model June 2015
leaf ttl {
type uint8;
default "255";
description
"Time to Live";
}
uses session-type;
leaf ecmp-choice {
type ecmp-choices;
description
"0 means use the specified interface
1 means use round robin";
}
leaf sub-type {
type identityref {
base command-sub-type;
}
description
"defines different command types";
}
list outgoing-interfaces {
key "interface";
leaf interface {
type if:interface-ref;
description
"outgoing interface";
}
description
"outgoing Interfaces";
}
leaf source-mep {
type MEP-name;
description
"Source MEP";
}
container destination-mp {
uses mp-address;
uses MEP-ID {
description "Only applicable if the destination is a MEP";
}
description
"Destination MEP";
}
leaf count {
type uint32;
default "3";
description
Senevirathne, et al. Expires December 3, 2015 [Page 35]
Internet-Draft Generic OAM YANG Model June 2015
"Number of ping echo request message to send";
}
leaf interval {
type Interval;
description
"Interval between echo requests";
}
leaf packet-size {
type uint32 {
range "64..10000";
}
default "64";
description
"Size of ping echo request packets, in octets";
}
}
output {
uses monitor-stats {
description
"Stats of continuity check is same as that of
monitor sessions";
}
}
}
rpc continuity-verification {
if-feature connectivity-verification;
description
"Generates continuity-verification as per RFC7276 Table 4.";
input {
uses maintenance-domain-id {
description
"defines the MD (Maintenance Domain) identifier, which is
the generic
MD-name-string and the technology.";
}
uses ma-identifier {
description
"identfies the Maintenance association";
}
uses flow-entropy;
uses priority;
leaf ttl {
type uint8;
default "255";
description
"Time to Live";
}
Senevirathne, et al. Expires December 3, 2015 [Page 36]
Internet-Draft Generic OAM YANG Model June 2015
uses session-type;
leaf ecmp-choice {
type ecmp-choices;
description
"0 means use the specified interface
1 means use round robin";
}
leaf sub-type {
type identityref {
base command-sub-type;
}
description
"defines different command types";
}
list outgoing-interfaces {
key "interface";
leaf interface {
type if:interface-ref;
description
"outgoing interface";
}
description
"outgoing Interfaces";
}
leaf source-mep {
type MEP-name;
description
"Source MEP";
}
container destination-mp {
uses mp-address;
uses MEP-ID {
description "Only applicable if the destination is a MEP";
}
description
"Destination MEP";
}
leaf count {
type uint32;
default "3";
description
"Number of ping echo request message to send";
}
leaf interval {
type Interval;
description
"Interval between echo requests";
}
Senevirathne, et al. Expires December 3, 2015 [Page 37]
Internet-Draft Generic OAM YANG Model June 2015
leaf packet-size {
type uint32 {
range "64..10000";
}
default "64";
description
"Size of ping echo request packets, in octets";
}
}
output {
uses monitor-stats {
description
"Stats of continuity check is same as that of
monitor sessions";
}
}
}
rpc path-discovery {
description
"Generates Trace-route or Path Trace and return response.
Referencing RFC7276 for common Toolset name, for IP it's
Traceroute, for MPLS OAM it's Traceroute mode, for
MPLS-TP OAM it's Route Tracing, for Pseudowire OAM it's
LSP Ping, and for TRILL OAM It's Path Tracing tool.
Starts with TTL
of one and increment by one at each hop. Untill destination
reached or TTL reach max valune";
input {
uses maintenance-domain-id {
description
"defines the MD (Maintenance Domain) identifier, which is
the generic MD-name-string and the technology.";
}
uses ma-identifier {
description
"identfies the Maintenance association";
}
uses flow-entropy;
uses priority;
leaf ttl {
type uint8;
default "255";
description
"Time to Live";
}
uses session-type;
leaf command-sub-type {
type identityref {
Senevirathne, et al. Expires December 3, 2015 [Page 38]
Internet-Draft Generic OAM YANG Model June 2015
base command-sub-type;
}
description
"defines different command types";
}
leaf ecmp-choice {
type ecmp-choices;
description
"0 means use the specified interface
1 means use round robin";
}
list outgoing-interfaces {
key "interface";
leaf interface {
type if:interface-ref;
description
"Interface.";
}
description
"Outgoing interface list.";
}
leaf source-mep {
type MEP-name;
description
"Source MEP";
}
container destination-mp {
uses mp-address;
uses MEP-ID {
description "Only applicable if the destination is a MEP";
}
description
"Destination MEP";
}
leaf count {
type uint32;
default "1";
description
"Number of traceroute probes to send. In protocols where a
separate message is sent at each TTL, this is the number
of packets to send at each TTL.";
}
leaf interval {
type Interval;
description
"Interval between echo requests";
}
}
Senevirathne, et al. Expires December 3, 2015 [Page 39]
Internet-Draft Generic OAM YANG Model June 2015
output {
list response {
key "response-index";
leaf response-index {
type uint8;
description
"Arbitrary index for the response. In protocols that
guarantee there is only a single response at each TTL
(eg IP Traceroute), the TTL can be used as the response
index.";
}
leaf ttl {
type uint8;
description
"Time to Live";
}
description
"Time to Live";
container destination-mp {
description "MP from which the response has been received";
uses mp-address;
uses MEP-ID {
description
"Only applicable if the destination is a MEP";
}
}
uses monitor-stats {
description
"If count is 1, there is a single delay value reported.";
}
}
description
"List of response.";
}
}
}
YANG module of OAM
<CODE ENDS>
6. Base Mode
The Base Mode defines default configuration that MUST be present in
the devices that comply with this document. Base Mode allows users
to have "zero-touch" experience. Several parameters require
technology specific definition.
Senevirathne, et al. Expires December 3, 2015 [Page 40]
Internet-Draft Generic OAM YANG Model June 2015
6.1. MEP Address
In the Base Mode of operation, the MEP Address is by default the IP
address of the interface on which the MEP is located.
6.2. MEP ID for Base Mode
In the Base Mode of operation, each device creates a single UP MEP
associated with a virtual OAM port with no physical layer (NULL PHY).
The MEPID associated with this MEP is zero (0). The choice of MEP-ID
zero is explained below.
MEPID is 2 octet field by default. It is never used on the wire
except when using CCM. Ping, traceroute and session monitoring does
not use the MEPID on its message header. It is important to have
method that can derive MEP ID of base mode in an automatic manner
with no user intervention. IP address cannot be directly used for
this purpose as the MEP ID is much smaller field. For Base Mode of
operation we propose to use MEP ID zero (0) as the default MEP-ID.
CCM packet use MEP-ID on the payload. CCM MUST NOT be used in the
Base Mode. Hence CCM MUST be disabled on the Maintenance Association
of the Base Mode.
If CCM is required, users MUST configure a separate Maintenance
association and assign unique value for the corresponding MEP IDs.
[IEEE802.1Q] CFM defines MEP ID as an unsigned integer in the range 1
to 8191. In this document we propose to extend the range to 0 to
65535. Value 0 is reserved for MEP ID of Base Mode operation and
MUST NOT be used for other purposes.
6.3. Maintenance Domain
Default MD-LEVEL is set to 3.
6.4. Maintenance Association
MAID [IEEE802.1Q] has a flexible format and includes two parts:
Maintenance Domain Name and Short MA name. In the Based Mode of
operation, the value of the Maintenance Domain Name must be the
character string "GenericBaseMode" (excluding the quotes "). In Base
Mode operation Short MA Name format is set to 2-octet integer format
(value 3 in Short MA Format field [IEEE802.1Q]) and Short MA name set
to 65532 (0xFFFC).
Senevirathne, et al. Expires December 3, 2015 [Page 41]
Internet-Draft Generic OAM YANG Model June 2015
7. Note
This section will be removed or subject to change in the future if
any agreement is reached. As per investigation of RFC7276 for
performance Monitoring for Loss and Delay are defined for MPLS
OAM(RFC6374[RFC6374]), OWAMP (RFC4656[RFC4656]) and TWAMP
(RFC5357[RFC5357]) and TRILL OAM (RFC7456[RFC7456]). In case of
Performance Monitoring Statistics are common between these
technologies thus generic Yang model for Performance will be worked
out through separate draft with Augmentation of Generic LIME model.
In case of Other Function, it's technology specific and thus should
be dealt in technology specific Yang model instead of Generic Model.
8. Security Considerations
The YANG module defined in this memo is designed to be accessed via
the NETCONF protocol [RFC6241] [RFC6241]. The lowest NETCONF layer
is the secure transport layer and the mandatory-to-implement secure
transport is SSH [RFC6242] [RFC6242]. The NETCONF access control
model [RFC6536] [RFC6536] provides the means to restrict access for
particular NETCONF users to a pre-configured subset of all available
NETCONF protocol operations and content.
There are a number of data nodes defined in the YANG module which are
writable/creatable/deletable (i.e., config true, which is the
default). These data nodes may be considered sensitive or vulnerable
in some network environments. Write operations (e.g., <edit-config>)
to these data nodes without proper protection can have a negative
effect on network operations.
The vulnerable "config true" subtrees and data nodes are the
following:
/goam:domains/goam:domain/
/goam:domains/goam:domain/goam:MAs/goam:MA/
/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP
/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:session/
Unauthorized access to any of these lists can adversely affect OAM
management system handling of end-to-end OAM and coordination of OAM
within underlying network layers This may lead to inconsistent
configuration, reporting, and presentation for the OAM mechanisms
used to manage the network.
Senevirathne, et al. Expires December 3, 2015 [Page 42]
Internet-Draft Generic OAM YANG Model June 2015
9. IANA Considerations
This document registers a URI in the IETF XML registry [RFC3688]
[RFC3688]. Following the format in RFC 3688, the following
registration is requested to be made:
URI: urn:ietf:params:xml:ns:yang:ietf-gen-oam
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
This document registers a YANG module in the YANG Module Names
registry [RFC6020].
name: ietf-gen-oam namespace: urn:ietf:params:xml:ns:yang:ietf-gen-oam
prefix: goam reference: RFC XXXX
10. Acknowledgments
Giles Heron came up with the idea of developing a YANG model as a way
of creating a unified OAM API set (interface), work in this document
is largely an inspiration of that. Alexander Clemm provided many
valuable tips, comments and remarks that helped to refine the YANG
model presented in this document.
Carlos Pignataro, David Ball and others participated and contributed
to this document.
11. References
11.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[RFC6020] Bjorklund, M., "YANG - A Data Modeling Language for the
Network Configuration Protocol (NETCONF)", RFC 6020,
October 2010.
[RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
Bierman, "Network Configuration Protocol (NETCONF)", RFC
6241, June 2011.
Senevirathne, et al. Expires December 3, 2015 [Page 43]
Internet-Draft Generic OAM YANG Model June 2015
[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, June 2011.
[RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration
Protocol (NETCONF) Access Control Model", RFC 6536, March
2012.
[RFC792] Postel, J., "Internet Control Message Protocol", RFC 792,
September 1981.
11.2. Informative References
[IEEE802.1Q]
"Media Access Control (MAC) Bridges and Virtual Bridged
Local Area Networks", IEEE Std 802.1Q-2011, August 2011.
[RFC4379] Kompella, K. and G. Swallow, "Detecting Multi-Protocol
Label Switched (MPLS) Data Plane Failures", RFC 4379,
February 2006.
[RFC4443] Conta, A., Deering, S., and M. Gupta, "Internet Control
Message Protocol (ICMPv6) for the Internet Protocol
Version 6 (IPv6) Specification", RFC 4443, March 2006.
[RFC4656] Shalunov, S., Teitelbaum, B., Karp, A., Boote, J., and M.
Zekauskas, "A One-way Active Measurement Protocol
(OWAMP)", RFC 4656, September 2006.
[RFC5357] Hedayat, K., Krzanowski, R., Morton, A., Yum, K., and J.
Babiarz, "A Two-Way Active Measurement Protocol (TWAMP)",
RFC 5357, October 2008.
[RFC6291] Andersson, L., van Helvoort, H., Bonica, R., Romascanu,
D., and S. Mansfield, "Guidelines for the Use of the "OAM"
Acronym in the IETF", BCP 161, RFC 6291, June 2011.
[RFC6325] Perlman, R., Eastlake, D., Dutt, D., Gai, S., and A.
Ghanwani, "Routing Bridges (RBridges): Base Protocol
Specification", RFC 6325, July 2011.
[RFC6371] Busi, I. and D. Allan, "Operations, Administration, and
Maintenance Framework for MPLS-Based Transport Networks",
RFC 6371, September 2011.
[RFC6374] Frost, D. and S. Bryant, "Packet Loss and Delay
Measurement for MPLS Networks", RFC 6374, September 2011.
Senevirathne, et al. Expires December 3, 2015 [Page 44]
Internet-Draft Generic OAM YANG Model June 2015
[RFC7174] Salam, S., Senevirathne, T., Aldrin, S., and D. Eastlake,
"Transparent Interconnection of Lots of Links (TRILL)
Operations, Administration, and Maintenance (OAM)
Framework", RFC 7174, May 2014.
[RFC7276] Mizrahi, T., Sprecher, N., Bellagamba, E., and Y.
Weingarten, "An Overview of Operations, Administration,
and Maintenance (OAM) Tools", RFC 7276, June 2014.
[RFC7455] Senevirathne, T., Finn, N., Salam, S., Kumar, D.,
Eastlake, D., Aldrin, S., and Y. Li, "Transparent
Interconnection of Lots of Links (TRILL): Fault
Management", RFC 7455, March 2015.
[RFC7456] Mizrahi, T., Senevirathne, T., Salam, S., Kumar, D., and
D. Eastlake, "Loss and Delay Measurement in Transparent
Interconnection of Lots of Links (TRILL)", RFC 7456, March
2015.
[Y.1731] "OAM functions and mechanisms for Ethernet based
networks", ITU-T Recommendation G.8013/Y.1731, 2013.
Authors' Addresses
Tissa Senevirathne
CISCO Systems
375 East Tasman Drive.
San Jose, CA 95134
USA
Phone: 408-853-2291
Email: tsenevir@cisco.com
Norman Finn
CISCO Systems
510 McCarthy Blvd
Milpitas, CA 95035
USA
Email: nfinn@cisco.com
Senevirathne, et al. Expires December 3, 2015 [Page 45]
Internet-Draft Generic OAM YANG Model June 2015
Deepak Kumar (editor)
CISCO Systems
510 McCarthy Blvd
Milpitas, CA 95035
USA
Email: dekumar@cisco.com
Samer Salam
CISCO Systems
595 Burrard St. Suite 2123
Vancouver, BC V7X 1J1
Canada
Email: ssalam@cisco.com
Qin Wu (editor)
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: bill.wu@huawei.com
Michael Wang
Huawei Technologies,Co.,Ltd
101 Software Avenue, Yuhua District
Nanjing 210012
China
Email: wangzitao@huawei.com
Senevirathne, et al. Expires December 3, 2015 [Page 46]