I2RS working group S. Hares
Internet-Draft Huawei
Intended status: Standards Track S. Kini
Expires: December 25, 2016 Ericsson
L. Dunbar
Huawei
R. Krishnan
Dell
D. Bogdanovic
Juniper Networks
R. White
Linkedin
June 23, 2016
Filter-Based RIB Data Model
draft-ietf-i2rs-fb-rib-data-model-00
Abstract
This document defines a data model to support the Filter-based
Routing Information Base (RIB) Yang data models for I2RS. A routing
system uses the Filter-based RIB to program FIB entries that process
incoming packets by matching on multiple fields within the packet and
then performing a specified action on it. The FB-RIB can also
specify an action to forward the packet according to the FIB entries
programmed using the RIBs of its routing instance.
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 25, 2016.
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Copyright Notice
Copyright (c) 2016 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
(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
1.1. Definition of I2RS Filter Based RIB . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 4
3. Definitions and Acronyms . . . . . . . . . . . . . . . . . . 4
4. High level Yang structure for the FB-RIB . . . . . . . . . . 5
4.1. Top Level Yang Structure for ietf-fb-rib . . . . . . . . 7
4.2. Filter-Based RIB structures . . . . . . . . . . . . . . . 8
5. yang models . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1. Filter-Based RIB types . . . . . . . . . . . . . . . . . 9
5.2. FB-RIB . . . . . . . . . . . . . . . . . . . . . . . . . 15
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
7. Security Considerations . . . . . . . . . . . . . . . . . . . 18
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. Normative References: . . . . . . . . . . . . . . . . . . 18
8.2. Informative References . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
The Interface to the Routing System (I2RS)
[I-D.ietf-i2rs-architecture] architecture provides dynamic read and
write access to the information and state within the routing
elements. The I2RS client interacts with the I2RS agent in one or
more network routing systems.
This document provides a yang module for the I2RS filter Based
Routing Information Base (FB-RIB) and describes the I2RS interaction
with routing filters within a routing element. The informational
model for the FB-RIB is in [I-D.kini-i2rs-fb-rib-info-model]
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1.1. Definition of I2RS Filter Based RIB
Filter-based routing is a technique used to make packet forwarding
decisions based on a filter that is matched to the incoming packets
and the specified action. It should be noted that that this is
distinct from the static routes in the RIB
[I-D.ietf-i2rs-rib-info-model] where the routing is destination
ddress based.
A Filter-Based RIB (Routing Information Base) is contained in a
routing instance (defined in [I-D.ietf-i2rs-rib-info-model]). It
contains a list of filters (match-action conditions) and a list of
interfaces the filter-based forwarding operates on, and default
RIB(s).
A Filter Based RIB uses packet forwarding policy. If packet
reception is considered an event, then the I2RS Filter-based RIB uses
a minimalistic Event-matchCondition-Action policy with the following
characteristics:
event = packet/frame received,
match condition - match on field in frame/packet or circumstances
relating to packet reception (e.g. time received),
action - modify packet and forward/drop packet.
A Filter-based RIB entry specifies match filters for the fields in a
packet (which may include layer 1 to layer 3 header fields, transport
or application fields) or size of the packet or interface received
on. The matches are contained in an ordered list of filters which
contain pairs of match condition-action (aka event-condition-action).
If all matches fail, default action is to forward the packet using
Destination Based forward from the default RIB(s). The default RIBs
can be:
o created by the I2RS Routing Informational Base (RIB) manager using
the yang model described in: in [I-D.ietf-i2rs-rib-info-model], or
o configured RIB created using static routes or
[I-D.ietf-netmod-routing-cfg].
o or static RIB created via static route yang model
Actions in the condition-action pair may impact forwarding or set
something in the packet that will impact forwarding. Policy actions
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are typically applied before applying QoS constraints since policy
actions may override QoS constraint.
The Filter-Based RIB resides in ephemeral state as does the I2RS RIB
and I2RS topology models.
2. Requirements Language
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.
3. Definitions and Acronyms
CLI
Command Line Interface
FB-RIB
Filter-Based Routing Information Base
FB-Route
The policy rules in the filter-based RIB are prescriptive of the
Event-Condition-Action form which is often represented by if
Condition then action".
Policy Group
Policy Groups are groups of policy rules. The groups of policy in
the basic network policy [I-D.hares-i2rs-pkt-eca-data-model] allow
grouping of policy by name. This structure allow easier
management of customer-based or provider based filters, but does
not change the policy-rules list.
RIB IM
RIB Informational Model (RIB IM) [I-D.ietf-i2rs-rib-info-model]
Routing instance
A routing instance, in the context of the FB-FIB is a collection
of RIBs, interfaces, and routing parameters. A routing instance
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creates a logical slice of the router and allows different logical
slices; across a set of routers; to communicate with each other.
4. High level Yang structure for the FB-RIB
There are three levels in the Filter-Based RIB (FB-RIB) structure:
o a global FB-RIB structures,
o the common structure of the FB-RIB, and
o the groupings that make up the FB-RIB
All structures have two types: configuration/ephemeral state and
operational state.
This yang model describes three types of FB-RIBS: configuration,
I2RS, and BGP Flow Specification. The configuration FB-RIB yang
module is config state ("config true" and "ephemeral false") and
survives a reboot. The I2RS FB-RB yang model is reboot ephemeral
("config true" and "ephemeral true;"). The BGP Flow Specification
Filter-Based RIB stores policy which is received by the BGP peers.
The BGP configuration contains a flow-specification as part of its
configuration, and the ability to export this flow specification to
other BGP peers. The BGP local configuration with the flow
specification is consider ("config true"), and it is possible to be
ephemeral ("ephemeral true") or local configuration ("ephemeral
false" ). The BGP flow specifications received from peers are
derived state, just like other BGP dervised state.
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Configuration RIBS
+-----------------------------------------+
| routing instance |
+-------|-------------|----------------|--+
| | |
| | |
+---------|----+ +-----|-----+ +--------|-----+
|config-fb-rib | |i2rs-fb-rib| |bgp-fs-fb-rib |
| | | | |config only |
+------|-------+ +-----|-----+ +------|-------+
|............:....|...............|
: (uses common structures
: in separate lists of FB-RIBs)
+--------|----+
|fb-ribs* |
| |
+--|----------+
|
Figure 3: Routing instance with three types of
Filter-FIB lists
The following section provides the high level yang structure diagrams
for the following levels of structures for both config/ephemeral
state and operationa.
o ietf-fb-rib - contains filter-based RIBS for config, I2RS FB-RIB,
and BGP Flow Specification.
o fb-rib - that contains the structures for the filter-based
grouping
o fb-rib-types - that contains the structures for groupings within
the filter-based RIBS
These structures are contained within the yang section in this draft.
The packet-reception ECA policy yang module is contained in the draft
[I-D.hares-i2rs-pkt-eca-data-model].
For those who desire more information regarding the logic behind the
I2RS Filter-Based RIB, please see the Informational Model at:
[I-D.kini-i2rs-fb-rib-info-model].
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4.1. Top Level Yang Structure for ietf-fb-rib
The Top-level Yang structure for a global FB-RIB types (similar to
acl) is not defined for filter-based RIBS. The I2RS Filter-Based RIB
should be defined under this structure under a routing instance. The
three things under this RIB would be: configured Filter-Based RIB
(aka Policy routing), I2RS reboot Ephemeral Filter-Based RIB, and BGP
Flow Specification's Filter-Based RIB. All of these RIBs have
similar actions.
There are two types top-level structures for ietf-fb-ribs: config and
operational state.
The Top-level Yang structure for a global configuration of Filter-
Based RIBs are:
Augments rt:logical-network-elements:\
:logical-network-element:network-instances: \
network-instance
ietf-fb-rib module
+--rw ietf-fb-rib
+--rw default-instance-name string
+--rw default-router-id rt:router-id
+--rw config-fb-ribs
if-feature "config-filter-based-RIB";
uses fb-ribs;
+--rw i2rs-fb-ribs
if-feature "I2RS-filter-based-RIB";
uses fb-rib-t:fb-ribs;
+--rw bgp-fs-fb-ribs
if-feature "BGP-FS-filter-based-RIB";
uses fb-rib-t:fb-ribs;
Figure 5: configuration state
The Top-level Yang structure for a global operational state of
Filter-Based RIBs are:
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Augments rt:logical-network-elements:\
:logical-network-element:network-instances: \
network-instance
ietf-fb-rib module
+--rw ietf-fb-rib-opstate
+--rw default-instance-name string
+--rw default-router-id rt:router-id
+--rw config-fb-rib-opstate
if-feature "config-filter-based-RIB";
uses fb-rib-t:fb-ribs-oper-status;
+--rw i2rs-fb-rib-opstate {
if-feature "I2RS-filter-based-RIB";
uses fb-rib-t:fb-ribs-oper-status;
+--rw bgp-fs-fb-rib-opstate
if-feature "BGP-FS-filter-based-RIB";
uses fb-rib-t:fb-ribs-oper-status;
Figure 5: operational state
4.2. Filter-Based RIB structures
The Top-level yang structures at the Filter-Based RIB level have two
types: configuration and operational state.
The Top-level Yang structure for the FB-RIB types is:
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module: fb-rib-types:
+--rw fb-ribs
+--rw fb-rib* [rib-name]
| +--rw rib-name string
| | rw fb-type identityref / ephemeral or not
| +--rw rib-afi rt:address-family
| +--rw fb-rib-intf* [name]
| | +--rw name string
| | +--rw intf if:interface
| +--rw default-rib
| | +--rw rt-rib string
| | +--rw config-rib string; // config rib name
| | +--rw i2rs-rib:routing-instance:name
| | +--rw i2rs-rib string; //ephemeral rib name
| | +--rw bgp-instance-name string
| | +--rw bgp-rib string //session ephemeral
| +--rw fb-rib-refs
| | +--rw fb-rib-update-ref uint32 /count of writes
| +--rw instance-using*
| | device:networking-instance:networking-instance-name
| +--use pkt-eca:pkt-eca-policy-set
rt-rib - refer to static rib.
Figure 6: FB RIB Type Structure
HIgh Level Yang
+--rw fb-ribs-oper-status
+--rw fb-rib-oper-status* [fb-rib-name]
uses pkt-eca:pkt-eca-opstate
5. yang models
5.1. Filter-Based RIB types
<CODE BEGINS> file "ietf-fb-rib-types@2016-02-09.yang"
module ietf-fb-rib-types {
yang-version "1";
// namespace
namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib-types";
prefix "fb-rib-t";
import ietf-interfaces {prefix "if";}
import ietf-routing {prefix "rt";}
import ietf-pkt-eca-policy {prefix "pkt-eca";}
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// meta
organization
"IETF";
contact
"email: shares@ndzh.com;
email: sriganesh.kini@ericsson.com
email: cengiz@packetdesign.com
email: ivandean@gmal.org
email: linda.dunbar@huawei.com;
email: russ@riw.com;
";
description
"This module describes a YANG model for the I2RS
Filter-based RIB Types. These types
specify types for the Filter-Based RIB.
Copyright (c) 2015 IETF Trust and the persons identified as
the document authors. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD
License set forth in Section 4.c of the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).";
revision "2016-02-09" {
description
"Filter-Based RIB protocol ";
reference "draft-hares-i2rs-fb-rib-data-model-01";
}
typedef fb-rib-type-def {
type identityref {
base "fb-rib-type";
}
description
"This type is used to refer to
source of Filter-Based RIB:
configuration, I2RS, Flow-Spec.";
}
identity fb-rib-type {
description
"This type is used to refer to
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source of Filter-Based RIB:
configuration, I2RS, Flow-Spec.";
}
identity fb-rib-config-type {
base fb-rib-type;
description
"config Filter-Based RIB";
}
identity fb-rib-i2rs-ephemeral-type {
base fb-rib-type;
description
"I2RS Reboot ephemeral Filter-Based RIB";
}
identity fb-rib-BGP-FS-type {
base fb-rib-type;
description
"BGP Flow Specification Filter-Based RIB";
}
typedef fb-rib-policy-type-def {
type identityref {
base "fb-rib-policy-type";
}
description
"This type is used to refer to FB-RIB type";
}
identity fb-rib-policy-type {
description
"Types of filter-based policies
acl and eca";
}
identity fb-rib-acl {
base fb-rib-policy-type;
description
"filter based policy based on access-lists";
}
identity fb-bnp-eca-rules {
base fb-rib-policy-type;
description
"filter based policy based on qos forwarding rules";
}
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typedef fb-rules-status {
type identityref {
base "fb-rule-opstat";
}
description
"This type is used to refer to FB-RIB type";
}
identity fb-rule-opstat {
description
"operational statues for filter rules
inactive and active";
}
identity fb-rule-inactive {
base fb-rule-opstat;
description
"policy rule is inactive";
}
identity fb-rule-active {
base fb-rule-opstat;
description
"policy rule is active";
}
grouping fb-rib-rule-order-status {
leaf statement-order {
type uint16;
description "order identifier";
}
leaf statement-oper_status {
type fb-rules-status;
description "status of rule";
}
description "filter-rib
policy rule order and status";
}
grouping fb-rib-group-order-status {
leaf group-refcnt {
type uint16;
description "refcnt for this group";
}
leaf group-installed {
type uint32;
description "number of rules installed";
}
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leaf group-matches {
type uint64;
description "number of matches by all
rules in group";
}
description "fb-rib group list order
and status info.";
}
grouping fb-rib-updates {
leaf fb-rib-update-ref {
type uint64;
description
"number of updates to this FB RIB
since last reboot";
}
description "FB-RIB update info";
}
grouping default-fb-rib {
// configuration instance for default RIB
leaf config-instance {
type string;
description "instance name - string until
netmod fixes mount issues";
}
leaf config-rib {
type string;
description "name of config default RIB";
}
//I2RS default instance for default RIB
leaf i2rs-instance-name {
type string;
description "I2RS instance name";
}
leaf i2rs-rib-name {
type string;
description "name of default I2RS RIB";
}
leaf bgp-instance-name {
type string;
description "name of bgp instance";
}
leaf bgp-fs-rib-name {
type string;
description "name of BGP
flow specification default RIB";
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}
description "default RIB for forwarding
if the policy match";
}
grouping fb-ribs {
list fb-rib {
key fb-rib-name;
leaf fb-rib-name {
type string;
mandatory true;
description "RIB name";
}
uses rt:address-family;
leaf fb-type {
type fb-rib-type-def;
description "type of RIB
list: config, I2RS rebooot
ephemeral, BGP Flow Specification
ephemeral. ";
}
list fb-rib-intf {
key "name";
leaf name {
type if:interface-ref;
description
"A reference to the name of a
configured network layer
interface.";
}
description "This represents
the list of interfaces
associated with this routing instance.
The interface list helps constrain the
boundaries of packet forwarding.
Packets coming on these interfaces are
directly associated with the given routing
instance. The interface list contains a
list of identifiers, with each identifier
uniquely identifying an interface.";
}
uses default-fb-rib; // defaults ribs
uses fb-rib-updates; // write refs to this RIB
list instance-using {
key instance-name;
leaf instance-name {
type string;
description
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" name of instance using this fb-rib
rt:routing-instance";
}
description "instances using
this fb-rib";
}
// ordered rule list + group list
uses pkt-eca:pkt-eca-policy-set;
description "Configuration of
an filter-based rib list";
}
description "fb-rib group";
}
grouping fb-ribs-oper-status {
list fb-rib-oper-status {
key fb-rib-name;
leaf fb-rib-name {
type string;
description "rib name";
}
uses pkt-eca:pkt-eca-opstate;
description "Configuration of
an filter-based rib list";
}
description "list of FB-FIB operational
status";
}
}
<CODE ENDS>
5.2. FB-RIB
<CODE BEGINS> file "ietf-fb-rib@2016-02-09.yang"
module ietf-fb-rib {
yang-version "1";
// namespace
namespace "urn:ietf:params:xml:ns:yang:ietf-fb-rib";
// replace with iana namespace when assigned
prefix "fb-rib";
// import some basic inet types
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import ietf-yang-types {prefix "yang";}
import ietf-fb-rib-types { prefix "fb-rib-t";}
// meta
organization
"IETF";
contact
"email: sriganesh.kini@ericsson.com
email: cengiz@packetdesign.com
email: anoop@ieee.duke.edu
email: ivandean@gmail.org
email: shares@ndzh.com;
email: linda.dunbar@huawei.com;
email: russ@riw.com;
";
description
"This Top level module describes a YANG model for the I2RS
Filter-based RIB which is an global protocol independent FB RIB module.";
revision "2016-02-09" {
description "initial revision";
reference "draft-hares-i2rs-fb-rib-data-model-01";
}
feature config-filter-based-RIB {
description
"This feature means that a node support
config filter-based rib.";
}
feature I2RS-filter-based-RIB {
description
"This feature means that a node support
I2RS filter-based rib.";
}
feature BGP-FS-filter-based-RIB {
description
"This feature means that a node support
BGP FS filter-based rib.";
}
container ietf-fb-rib {
presence "top-level structure for
configuration";
leaf default-instance-name {
type string;
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mandatory true;
description
"A routing instance is identified by its name,
INSTANCE_name. This MUST be unique across all routing
instances in a given network device.";
}
leaf default-router-id {
type yang:dotted-quad;
description "Default router id";
}
container config-fb-rib {
if-feature config-filter-based-RIB;
uses fb-rib-t:fb-ribs;
description "config filter-based RIB";
}
container i2rs-fb-rib {
if-feature I2RS-filter-based-RIB;
uses fb-rib-t:fb-ribs;
description "bgp-fs filter-based RIB";
}
container bgp-fs-fb-rib {
if-feature BGP-FS-filter-based-RIB;
uses fb-rib-t:fb-ribs;
description "bgp fs filter-based RIB";
}
description "fb-rib augments routing instance";
}
container ietf-fb-rib-opstate {
presence "top-level structure for
op-state";
config "false";
leaf default-instance-name {
type string;
mandatory true;
description
"A routing instance is identified by its name,
INSTANCE_name. This MUST be unique across all routing
instances in a given network device.";
}
leaf default-router-id {
type yang:dotted-quad;
description "Default router id";
}
container config-fb-rib-opstate {
if-feature config-filter-based-RIB;
uses fb-rib-t:fb-ribs-oper-status;
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description "config filter-based RIB";
}
container i2rs-fb-rib-opstate {
if-feature I2RS-filter-based-RIB;
uses fb-rib-t:fb-ribs-oper-status;
description "bgp-fs filter-based RIB";
}
container bgp-fs-fb-rib-opstate {
if-feature BGP-FS-filter-based-RIB;
uses fb-rib-t:fb-ribs-oper-status;
description "bgp fs filter-based RIB";
}
description "fb-rib augments routing instance";
}
}
<CODE ENDS>
6. IANA Considerations
TBD
7. Security Considerations
A I2RS RIB is ephemeral data store that will dyanamically change
traffic paths set by the routing configuration. An I2RS FB-RIB
provides dynamic Event-Condition-Action policy that will further
change the operation of forwarding by allow dyanmic policy and
ephemeral RIBs to alter the traffic paths set by routing
configuration. Care must be taken in deployments to use the
appropriate security and operational control to make use of the tools
the I2RS RIB and I2RS FB-RIB provide.
8. References
8.1. Normative References:
[I-D.hares-i2rs-pkt-eca-data-model]
Hares, S., Wu, Q., and R. White, "Filter-Based Packet
Forwarding ECA Policy", draft-hares-i2rs-pkt-eca-data-
model-02 (work in progress), February 2016.
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[I-D.ietf-i2rs-architecture]
Atlas, A., Halpern, J., Hares, S., Ward, D., and T.
Nadeau, "An Architecture for the Interface to the Routing
System", draft-ietf-i2rs-architecture-15 (work in
progress), April 2016.
[I-D.ietf-i2rs-rib-data-model]
Wang, L., Ananthakrishnan, H., Chen, M.,
amit.dass@ericsson.com, a., Kini, S., and N. Bahadur, "A
YANG Data Model for Routing Information Base (RIB)",
draft-ietf-i2rs-rib-data-model-05 (work in progress),
March 2016.
[I-D.ietf-i2rs-rib-info-model]
Bahadur, N., Kini, S., and J. Medved, "Routing Information
Base Info Model", draft-ietf-i2rs-rib-info-model-08 (work
in progress), October 2015.
[I-D.ietf-netmod-acl-model]
Bogdanovic, D., Koushik, K., Huang, L., and D. Blair,
"Network Access Control List (ACL) YANG Data Model",
draft-ietf-netmod-acl-model-07 (work in progress), March
2016.
[I-D.ietf-netmod-routing-cfg]
Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
Management", draft-ietf-netmod-routing-cfg-21 (work in
progress), March 2016.
[I-D.kini-i2rs-fb-rib-info-model]
Kini, S., Hares, S., Dunbar, L., Ghanwani, A., Krishnan,
R., Bogdanovic, D., and R. White, "Filter-Based RIB
Information Model", draft-kini-i2rs-fb-rib-info-model-03
(work in progress), February 2016.
8.2. Informative References
[I-D.acee-rtgwg-yang-rib-extend]
Lindem, A. and Y. Qu, "RIB YANG Data Model", draft-acee-
rtgwg-yang-rib-extend-01 (work in progress), March 2016.
[I-D.ietf-i2rs-usecase-reqs-summary]
Hares, S. and M. Chen, "Summary of I2RS Use Case
Requirements", draft-ietf-i2rs-usecase-reqs-summary-02
(work in progress), March 2016.
Hares, et al. Expires December 25, 2016 [Page 19]
Internet-Draft Filter-Base RIB DM June 2016
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
Authors' Addresses
Susan Hares
Huawei
7453 Hickory Hill
Saline, MI 48176
USA
Email: shares@ndzh.com
Sriganesh Kini
Ericsson
Email: sriganesh.kini@ericsson.com
Linda Dunbar
Huawei
USA
Email: linda.dunbar@huawei.com
Ram Krishnan
Dell
Email: Ramkri123@gmail.com
Dean Bogdanovic
Juniper Networks
Westford, MA
Email: ivandean@gmail.org
Russ White
Linkedin
Email: russ@riw.us
Hares, et al. Expires December 25, 2016 [Page 20]
