| Network Working Group | A. Clemm |
| Internet-Draft | J. Medved |
| Intended status: Standards Track | Cisco |
| Expires: June 13, 2016 | R. Varga |
| T. Tkacik | |
| Pantheon Technologies SRO | |
| X. Liu | |
| Ericsson | |
| I. Bryskin | |
| Huawei | |
| A. Guo | |
| Adva Optical | |
| H. Ananthakrishnan | |
| Packet Design | |
| N. Bahadur | |
| Bracket Computing | |
| V. Beeram | |
| Juniper Networks | |
| December 11, 2015 |
A YANG Data Model for Layer 3 Topologies
draft-ietf-i2rs-yang-l3-topology-01.txt
This document defines a YANG data model for layer 3 network topologies.
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 June 13, 2016.
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 (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.
This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.
This document introduces a YANG [RFC6020] [RFC6991] [I-D.draft-ietf-netmod-rfc6020bis-09] data model for Layer 3 network topologies. The model allows an application to have a holistic view of the topology of a Layer 3 network, all contained in a single conceptual YANG datastore. The data model builds on top of, and augments, the data model for network topologies defined in [I-D.draft-ietf-i2rs-yang-network-topo]. An earlier revision of that Internet Draft contained not just the general model for network topologies, but also the model for layer 3 network topologies that is being specified here. However, we decided to "split" the earlier draft to separate the truly general aspects of a topology data model, which apply to any type of topology, from the application of this model to a particular domain, here: a Layer 3 network.
Specific topology types that are covered in this document include Layer 3 Unicast IGP, IS-IS [RFC1195], and OSPF [RFC2178]. In addition, this documents defines a set of traffic engineering extensions.
There are multiple applications for such a data model and a number of use cases have been defined in section 6 of [I-D.draft-ietf-i2rs-usecase-reqs-summary]. For example, nodes within the network can use the data model to capture their understanding of the overall network topology and expose it to a network controller. A network controller can then use the instantiated topology data to compare and reconcile its own view of the network topology with that of the network elements that it controls. Alternatively, nodes within the network could propagate this understanding to compare and reconcile this understanding either amongst themselves or with help of a controller. Beyond the network element itself, a network controller might even use the data model to represent its view of the topology that it controls and expose it to applications north of itself.
There are several reasons to choose YANG to define the data model. Data defined using YANG can be exposed by a server to client applications and controllers via Netconf [RFC6241] or via a ReST-like Interface [I-D.draft-ietf-netconf-restconf] [I-D.draft-ietf-netmod-yang-json]. The fact that it can be used with different protocols and interfaces provides for a degree of "future-proofing" of model implementations. Also, YANG can serve as the basis for model-driven toolchains, such as used in the Open Daylight project.
The data model is defined in several YANG modules:
Information that is kept in the Traffic Engineering Database (TED) is specified in a separate model and outside the scope of this specification.
Datastore: A conceptual store of instantiated management information, with individual data items represented by data nodes which are arranged in hierarchical manner.
Data subtree: An instantiated data node and the data nodes that are hierarchically contained within it.
HTTP: Hyper-Text Transfer Protocol
IGP: Interior Gateway Protocol
IS-IS: Intermediate System to Intermediate System protocol
LSP: Label Switched Path
NETCONF: Network Configuration Protocol
OSPF: Open Shortest Path First, a link state routing protocol
URI: Uniform Resource Identifier
ReST: Representational State Transfer, a style of stateless interface and protocol that is generally carried over HTTP
SRLG: Shared Risk Link Group
TED: Traffic Engineering Database
YANG: A data definition language for NETCONF
This section provides an overview of the Layer 3 network topology model.
The network topology model is defined by the following YANG modules, whose relationship is roughly depicted in the figure below. The base network topology is included in the diagram for completeness.
+-----------------------------+
| +-----------------------+ |
| | ietf-network | |
| +----------^------------+ |
| | |
| +-----------------------+ |
| | ietf-network-topology | |
| +----------+------------+ |
+-------------^---------------+
|
|
+-----------^-------------+
| l3-unicast-igp-topology |
+----+---------------+----+
^ ^
| |
| |
+--------^-----+ +-----^---------+
| ospf-topology| | isis-topology |
+--------------+ +---------------+
Figure 1: Overall model structure
YANG modules ietf-network and ietf-network-topology collectively define the basic network topology model. YANG module ietf-l3-unicast-igp-topology augments those models with additional definitions needed to represent Layer 3 Unicast IGP topologies. This module in turn is augmented by YANG modules with additional definitions for OSPF and for IS-IS topologies, ietf-ospf-topology and ietf-isis-topology, respectively.
The Layer 3 Unicast IGP topology model is defined by YANG module "ietf-l3-unicast-igp-topology". The model is depicted in the following diagram. Brackets enclose list keys, "rw" means configuration, "ro" operational state data, "?" designates optional nodes, "*" designates nodes that can have multiple instances. Parantheses enclose choice and case nodes. Notifications are not depicted. The prefix "nt:" refers to the YANG module for network topology.
module: ietf-l3-unicast-igp-topology
augment /nw:networks/nw:network/nw:network-types:
+--rw l3-unicast-igp-topology!
augment /nw:networks/nw:network:
+--rw igp-topology-attributes
+--rw name? string
+--rw flag* flag-type
augment /nw:networks/nw:network/nw:node:
+--rw igp-node-attributes
+--rw name? inet:domain-name
+--rw flag* flag-type
+--rw router-id* inet:ip-address
+--rw prefix* [prefix]
+--rw prefix inet:ip-prefix
+--rw metric? uint32
+--rw flag* flag-type
augment /nw:networks/nw:network/nt:link:
+--rw igp-link-attributes
+--rw name? string
+--rw flag* flag-type
+--rw metric? uint32
augment /nw:networks/nw:network/nw:node/nt:termination-point:
+--rw igp-termination-point-attributes
+--rw (termination-point-type)?
+--:(ip)
| +--rw ip-address* inet:ip-address
+--:(unnumbered)
+--rw unnumbered-id? uint32
The module augments the original ietf-network and ietf-network-topology modules as follows:
In addition, the module defines a set of notifications to alert clients of any events concerning links, nodes, prefixes, and termination points. Each notification includes an indication of the type of event, the topology from which it originated, and the affected node, or link, or prefix, or termination point. In addition, as a convenience to applications, additional data of the affected node, or link, or termination point (respectively) is included. While this makes notifications larger in volume than they would need to be, it avoids the need for subsequent retrieval of context information, which also might have changed in the meantime.
OSPF is the next type of topology represented in the model. OSPF represents a particular type of Layer 3 Unicast IGP. Accordingly, this time the Layer 3 Unicast IGP topology model needs to be extended. The corresponding extensions are introduced in a separate YANG module "ietf-ospf-topology", whose structure is depicted in the following diagram. For the most part, this module augments "ietf-l3-unicast-igp-topology". Like before, brackets enclose list keys, "rw" means configuration, "ro" operational state data, "?" designates optional nodes, "*" designates nodes that can have multiple instances. Parantheses enclose choice and case nodes. A "+" at the end of a line indicates a line break. Notifications respectively augmentations of notifications are not depicted.
module: ietf-ospf-topology
augment /nw:networks/nw:network/nw:network-types/+
| l3t:l3-unicast-igp-topology:
+--rw ospf!
augment /nw:networks/nw:network/l3t:igp-topology-attributes:
+--rw ospf-topology-attributes
+--rw area-id? area-id
augment /nw:networks/nw:network/nw:node/l3t:igp-node-attributes:
+--rw ospf-node-attributes
+--rw (router-type)?
| +--:(abr)
| | +--rw abr? empty
| +--:(asbr)
| | +--rw asbr? empty
| +--:(internal)
| | +--rw internal? empty
| +--:(pseudonode)
| +--rw pseudonode? empty
+--rw dr-interface-id? uint32
+--rw multi-topology-id* uint8
+--rw capabilities? bits
augment /nw:networks/nw:network/nt:link/l3t:igp-link-attributes:
+--rw ospf-link-attributes
+--rw multi-topology-id? uint8
augment /nw:networks/nw:network/nw:node/l3t:igp-node-attributes/+
| l3t:prefix:
+--rw ospf-prefix-attributes
+--rw forwarding-address? inet:ipv4-address
The module augments "ietf-l3-unicast-igp-topology" as follows:
In addition, the module extends IGP node, link and prefix notifications with OSPF attributes.
IS-IS is another type of Layer 3 Unicast IGP. Like OSPF topology, IS-IS topology is defined in a separate module, "ietf-isis-topology", which augments "ietf-l3-unicast-igp-topology". The structure is depicted in the following diagram. Like before, brackets enclose list keys, "rw" means configuration, "ro" operational state data, "?" designates optional nodes, "*" designates nodes that can have multiple instances. Parantheses enclose choice and case nodes. A "+" at the end of a line indicates a line break. Notifications are not depicted.
module: ietf-isis-topology
augment /nw:networks/nw:network/nw:network-types/+
| l3t:l3-unicast-igp-topology:
+--rw isis!
augment /nw:networks/nw:network/l3t:igp-topology-attributes:
+--rw isis-topology-attributes
+--rw net? iso-net-id
augment /nw:networks/nw:network/nw:node/l3t:igp-node-attributes:
+--rw isis-node-attributes
+--rw iso
| +--rw iso-system-id? iso-system-id
| +--rw iso-pseudonode-id? iso-pseudonode-id
+--rw net* iso-net-id
+--rw multi-topology-id* uint8
+--rw (router-type)?
+--:(level-2)
| +--rw level-2? empty
+--:(level-1)
| +--rw level-1? empty
+--:(level-1-2)
+--rw level-1-2? empty
augment /nw:networks/nw:network/nt:link/l3t:igp-link-attributes:
+--rw isis-link-attributes
+--rw multi-topology-id? uint8
The module augments the ietf-l3-unicast-igp-topology as follows:
In addition, the module augments IGP nodes and links with ISIS attributes.
<CODE BEGINS> file "ietf-l3-unicast-igp-topology@2015-12-11.yang"
module ietf-l3-unicast-igp-topology {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-l3-unicast-igp-topology";
prefix "l3t";
import ietf-network {
prefix "nw";
}
import ietf-network-topology {
prefix "nt";
}
import ietf-inet-types {
prefix "inet";
}
organization
"IETF I2RS (Interface to the Routing System) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/i2rs/>
WG List: <mailto:i2rs@ietf.org>
WG Chair: Susan Hares
<mailto:shares@ndzh.com>
WG Chair: Jeffrey Haas
<mailto:jhaas@pfrc.org>
Editor: Alexander Clemm
<mailto:alex@cisco.com>
Editor: Jan Medved
<mailto:jmedved@cisco.com>
Editor: Robert Varga
<mailto:rovarga@cisco.com>
Editor: Tony Tkacik
<mailto:ttkacik@cisco.com>
Editor: Xufeng Liu
<mailto:xufeng.liu@ericsson.com>
Editor: Igor Bryskin
<mailto:Igor.Bryskin@huawei.com>
Editor: Aihua Guo
<mailto:aguo@advaoptical.com>
Editor: Nitin Bahadur
<mailto:nitin_bahadur@yahoo.com>
Editor: Hariharan Ananthakrishnan
<mailto:hari@packetdesign.com>
Editor: Vishnu Pavan Beeram
<mailto:vbeeram@juniper.net>";
description
"This module defines a model for Layer 3 Unicast IGP
topologies.
Copyright (c) 2015 IETF Trust and the persons identified as
authors of the code. 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).
This version of this YANG module is part of
draft-ietf-i2rs-yang-network-topo-02;
see the RFC itself for full legal notices.
NOTE TO RFC EDITOR: Please replace above reference to
draft-ietf-i2rs-yang-network-topo-02 with RFC
number when published (i.e. RFC xxxx).";
revision "2015-12-11" {
description
"Initial revision.
NOTE TO RFC EDITOR: Please replace the following reference
to draft-ietf-i2rs-yang-l3-topology-01 with
RFC number when published (i.e. RFC xxxx).";
reference
"draft-ietf-i2rs-yang-l3-topology-01";
}
typedef igp-event-type {
type enumeration {
enum "add" {
value 0;
description
"An IGP node or link or prefix or termination-point has
been added";
}
enum "remove" {
value 1;
description
"An IGP node or link or prefix or termination-point has
been removed";
}
enum "update" {
value 2;
description
"An IGP node or link or prefix or termination-point has
been updated";
}
}
description "IGP Event type for notifications";
} // igp-event-type
identity flag-identity {
description "Base type for flags";
}
identity undefined-flag {
base "flag-identity";
description "Undefined flag";
}
typedef flag-type {
type identityref {
base "flag-identity";
}
description "Type for flags";
}
grouping network-ref {
description
"Grouping for an absolute reference to a network topology
instance.";
leaf network-ref {
type leafref {
path "/nw:networks/nw:network/nw:network-id";
}
description
"An absolute reference to a network topology instance.";
}
}
grouping link-ref {
description
"Grouping for an absolute reference to a link instance.";
uses network-ref;
leaf link-ref {
type leafref {
path "/nw:networks/nw:network"
+"[nw:network-id = current()/../network-ref]"
+"/nt:link/nt:link-id";
}
description
"An absolute reference to a link instance.";
}
}
grouping node-ref {
description
"Grouping for an absolute reference to a node instance.";
uses network-ref;
leaf node-ref {
type leafref {
path "/nw:networks/nw:network"
+"[nw:network-id = current()/../network-ref]"
+"/nw:node/nw:node-id";
}
description
"An absolute reference to a node instance.";
}
}
grouping tp-ref {
description
"Grouping for an absolute reference to a termination point.";
uses node-ref;
leaf tp-ref {
type leafref {
path "/nw:networks/nw:network"
+"[nw:network-id = current()/../network-ref]"
+"/nw:node[nw:node-id = current()/../node-ref]"
+"/nt:termination-point/nt:tp-id";
}
description
"Grouping for an absolute reference to a termination point.";
}
}
grouping igp-prefix-attributes {
description
"IGP prefix attributes";
leaf prefix {
type inet:ip-prefix;
description
"IP prefix value";
}
leaf metric {
type uint32;
description
"Prefix metric";
}
leaf-list flag {
type flag-type;
description
"Prefix flags";
}
}
grouping l3-unicast-igp-topology-type {
description "Identify the topology type to be L3 unicast.";
container l3-unicast-igp-topology {
presence "indicates L3 Unicast IGP Topology";
description
"The presence of the container node indicates L3 Unicast
IGP Topology";
}
}
grouping igp-topology-attributes {
description "Topology scope attributes";
container igp-topology-attributes {
description "Containing topology attributes";
leaf name {
type string;
description
"Name of the topology";
}
leaf-list flag {
type flag-type;
description
"Topology flags";
}
}
}
grouping igp-node-attributes {
description "IGP node scope attributes";
container igp-node-attributes {
description
"Containing node attributes";
leaf name {
type inet:domain-name;
description
"Node name";
}
leaf-list flag {
type flag-type;
description
"Node operational flags";
}
leaf-list router-id {
type inet:ip-address;
description
"Router-id for the node";
}
list prefix {
key "prefix";
description
"A list of prefixes along with their attributes";
uses igp-prefix-attributes;
}
}
}
grouping igp-link-attributes {
description
"IGP link scope attributes";
container igp-link-attributes {
description
"Containing link attributes";
leaf name {
type string;
description
"Link Name";
}
leaf-list flag {
type flag-type;
description
"Link flags";
}
leaf metric {
type uint32 {
range "0..16777215" {
description
"This is a metric that can take a 3 byte metric,
commonly used in OSPF/ISIS";
}
}
description
"Link Metric";
}
}
}
grouping igp-termination-point-attributes {
description "IGP termination point scope attributes";
container igp-termination-point-attributes {
description
"Containing termination point attributes";
choice termination-point-type {
description
"Indicates the termination point type";
case ip {
leaf-list ip-address {
type inet:ip-address;
description
"IPv4 or IPv6 address";
}
}
case unnumbered {
leaf unnumbered-id {
type uint32;
description
"Unnumbered interface identifier";
}
}
}
}
} // grouping igp-termination-point-attributes
augment "/nw:networks/nw:network/nw:network-types" {
description
"Introduce new network type for L3 unicast IGP topology";
uses l3-unicast-igp-topology-type;
}
augment "/nw:networks/nw:network" {
when "nw:network-types/l3-unicast-igp-topology" {
description
"Augmentation parameters apply only for networks with
L3 unicast IGP topology";
}
description
"Configuration parameters for L3 unicast IPG for the network
as a whole";
uses igp-topology-attributes;
}
augment "/nw:networks/nw:network/nw:node" {
when "../nw:network-types/l3-unicast-igp-topology" {
description
"Augmentation parameters apply only for networks with
L3 unicast IGP topology";
}
description
"Configuration parameters for L3 unicast IPG at the node
level";
uses igp-node-attributes;
}
augment "/nw:networks/nw:network/nt:link" {
when "../nw:network-types/l3-unicast-igp-topology" {
description
"Augmentation parameters apply only for networks with
L3 unicast IGP topology";
}
description
"Augment topology link configuration";
uses igp-link-attributes;
}
augment "/nw:networks/nw:network/nw:node/"
+"nt:termination-point" {
when "../../nw:network-types/l3-unicast-igp-topology" {
description
"Augmentation parameters apply only for networks with
L3 unicast IGP topology";
}
description "Augment topology termination point configuration";
uses igp-termination-point-attributes;
}
notification igp-node-event {
description
"Notification event for IGP node";
leaf igp-event-type {
type igp-event-type;
description
"Event type";
}
uses node-ref;
uses l3-unicast-igp-topology-type;
uses igp-node-attributes;
}
notification igp-link-event {
description
"Notification event for IGP link";
leaf igp-event-type {
type igp-event-type;
description
"Event type";
}
uses link-ref;
uses l3-unicast-igp-topology-type;
uses igp-link-attributes;
}
notification igp-prefix-event {
description
"Notification event for IGP prefix";
leaf igp-event-type {
type igp-event-type;
description
"Event type";
}
uses node-ref;
uses l3-unicast-igp-topology-type;
container prefix {
description
"Containing IPG prefix attributes";
uses igp-prefix-attributes;
}
}
notification termination-point-event {
description
"Notification event for IGP termination point";
leaf igp-event-type {
type igp-event-type;
description
"Event type";
}
uses tp-ref;
uses l3-unicast-igp-topology-type;
uses igp-termination-point-attributes;
}
}
<CODE ENDS>
<CODE BEGINS> file "ietf-ospf-topology@2015-12-11.yang"
module ietf-ospf-topology {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-ospf-topology";
prefix "ospf";
import ietf-inet-types {
prefix "inet";
}
import ietf-network {
prefix "nw";
}
import ietf-network-topology {
prefix "nt";
}
import ietf-l3-unicast-igp-topology {
prefix "l3t";
}
organization
"IETF I2RS (Interface to the Routing System) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/i2rs/>
WG List: <mailto:i2rs@ietf.org>
WG Chair: Susan Hares
<mailto:shares@ndzh.com>
WG Chair: Jeffrey Haas
<mailto:jhaas@pfrc.org>
Editor: Alexander Clemm
<mailto:alex@cisco.com>
Editor: Jan Medved
<mailto:jmedved@cisco.com>
Editor: Robert Varga
<mailto:rovarga@cisco.com>
Editor: Tony Tkacik
<mailto:ttkacik@cisco.com>
Editor: Xufeng Liu
<mailto:xufeng.liu@ericsson.com>
Editor: Igor Bryskin
<mailto:Igor.Bryskin@huawei.com>
Editor: Aihua Guo
<mailto:aguo@advaoptical.com>
Editor: Nitin Bahadur
<mailto:nitin_bahadur@yahoo.com>
Editor: Hariharan Ananthakrishnan
<mailto:hari@packetdesign.com>
Editor: Vishnu Pavan Beeram
<mailto:vbeeram@juniper.net>";
description
"This module defines a model for OSPF network topologies.
Copyright (c) 2015 IETF Trust and the persons identified as
authors of the code. 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).
This version of this YANG module is part of
draft-ietf-i2rs-yang-network-topo-02;
see the RFC itself for full legal notices.
NOTE TO RFC EDITOR: Please replace above reference to
draft-ietf-i2rs-yang-network-topo-02 with RFC
number when published (i.e. RFC xxxx).";
revision "2015-12-11" {
description
"Initial revision.
NOTE TO RFC EDITOR: Please replace the following reference
to draft-ietf-i2rs-yang-l3-topology-01 with
RFC number when published (i.e. RFC xxxx).";
reference
"draft-ietf-i2rs-yang-l3-topology-01";
}
typedef area-id {
type uint32;
description
"OSPF Area ID";
}
grouping ospf-topology-type {
description
"Identifies the OSPF topology type.";
container ospf {
presence "indiates OSPF Topology";
description
"Its presence identifies the OSPF topology type.";
}
}
augment "/nw:networks/nw:network/nw:network-types/"
+ "l3t:l3-unicast-igp-topology" {
description
"Defines the OSPF topology type.";
uses ospf-topology-type;
}
augment "/nw:networks/nw:network/l3t:igp-topology-attributes" {
when "../nw:network-types/l3t:l3-unicast-igp-topology/ospf" {
description
"Augment only for OSPF topology";
}
description
"Augment topology configuration";
container ospf-topology-attributes {
description
"Containing topology attributes";
leaf area-id {
type area-id;
description
"OSPF area ID";
}
}
}
augment "/nw:networks/nw:network/nw:node/l3t:igp-node-attributes" {
when "../../nw:network-types/l3t:l3-unicast-igp-topology/ospf" {
description
"Augment only for OSPF topology";
}
description
"Augment node configuration";
uses ospf-node-attributes;
}
augment "/nw:networks/nw:network/nt:link/l3t:igp-link-attributes" {
when "../../nw:network-types/l3t:l3-unicast-igp-topology/ospf" {
description
"Augment only for OSPF topology";
}
description
"Augment link configuration";
uses ospf-link-attributes;
}
augment "/nw:networks/nw:network/nw:node/"+
"l3t:igp-node-attributes/l3t:prefix" {
when "../../../nw:network-types/l3t:l3-unicast-igp-topology/"
+"ospf" {
description
"Augment only for OSPF topology";
}
description
"Augment prefix";
uses ospf-prefix-attributes;
}
grouping ospf-node-attributes {
description
"OSPF node scope attributes";
container ospf-node-attributes {
description
"Containing node attributes";
choice router-type {
description
"Indicates router type";
case abr {
leaf abr {
type empty;
description
"The node is ABR";
}
}
case asbr {
leaf asbr {
type empty;
description
"The node is ASBR";
}
}
case internal {
leaf internal {
type empty;
description
"The node is internal";
}
}
case pseudonode {
leaf pseudonode {
type empty;
description
"The node is pseudonode";
}
}
}
leaf dr-interface-id {
when "../router-type/pseudonode" {
description
"Valid only for pseudonode";
}
type uint32;
default "0";
description
"For pseudonodes, DR interface-id";
}
leaf-list multi-topology-id {
type uint8 {
range "0..127";
}
max-elements "128";
description
"List of Multi-Topology Identifier up-to 128 (0-127).
See RFC 4915";
}
leaf capabilities {
type bits {
bit graceful-restart-capable {
position 0;
description
"Graceful restart capable";
}
bit graceful-restart-helper {
position 1;
description
"Graceful restart helper";
}
bit stub-router-support {
position 2;
description
"Stub router support";
}
bit traffic-engineering-support {
position 3;
description
"Traffic engineering support";
}
bit point-to-point-over-lan {
position 4;
description
"Support point to point over LAN";
}
bit experimental-te {
position 5;
description
"Support experimental traffic engineering";
}
}
description
"OSPF capabilities as bit vector. RFC 4970";
}
}
}
grouping ospf-link-attributes {
description
"OSPF link scope attributes";
container ospf-link-attributes {
description
"Containing OSPF link attributes";
leaf multi-topology-id {
type uint8 {
range "0..127";
}
description "Muti topology ID";
}
}
} // ospf-link-attributes
grouping ospf-prefix-attributes {
description
"OSPF prefix attributes";
container ospf-prefix-attributes {
description
"Containing prefix attributes";
leaf forwarding-address {
when "../../l3t:l3-unicast-igp-topology/l3t:ospf/"+
"l3t:router-type/l3t:asbr" {
description "Valid only for ABSR";
}
type inet:ipv4-address;
description
"Forwarding address for ABSR";
}
}
}
augment "/l3t:igp-node-event" {
description
"OSPF node event";
uses ospf-topology-type;
uses ospf:ospf-node-attributes;
}
augment "/l3t:igp-link-event" {
description
"OSPF link event";
uses ospf-topology-type;
uses ospf:ospf-link-attributes;
}
augment "/l3t:igp-prefix-event" {
description
"OSPF prefix event";
uses ospf-topology-type;
uses ospf:ospf-prefix-attributes;
}
}
<CODE ENDS>
<CODE BEGINS> file "isis-topology@2015-12-11.yang"
module ietf-isis-topology {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-isis-topology";
prefix "isis";
import ietf-network {
prefix "nw";
}
import ietf-network-topology {
prefix "nt";
}
import ietf-l3-unicast-igp-topology {
prefix "l3t";
}
organization
"IETF I2RS (Interface to the Routing System) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/i2rs/>
WG List: <mailto:i2rs@ietf.org>
WG Chair: Susan Hares
<mailto:shares@ndzh.com>
WG Chair: Jeffrey Haas
<mailto:jhaas@pfrc.org>
Editor: Alexander Clemm
<mailto:alex@cisco.com>
Editor: Jan Medved
<mailto:jmedved@cisco.com>
Editor: Robert Varga
<mailto:rovarga@cisco.com>
Editor: Tony Tkacik
<mailto:ttkacik@cisco.com>
Editor: Xufeng Liu
<mailto:xufeng.liu@ericsson.com>
Editor: Igor Bryskin
<mailto:Igor.Bryskin@huawei.com>
Editor: Aihua Guo
<mailto:aguo@advaoptical.com>
Editor: Nitin Bahadur
<mailto:nitin_bahadur@yahoo.com>
Editor: Hariharan Ananthakrishnan
<mailto:hari@packetdesign.com>
Editor: Vishnu Pavan Beeram
<mailto:vbeeram@juniper.net>";
description
"This module defines a model for IS-IS network topologies.
Copyright (c) 2015 IETF Trust and the persons identified as
authors of the code. 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).
This version of this YANG module is part of
draft-ietf-i2rs-yang-network-topo-02;
see the RFC itself for full legal notices.
NOTE TO RFC EDITOR: Please replace above reference to
draft-ietf-i2rs-yang-network-topo-02 with RFC
number when published (i.e. RFC xxxx).";
revision "2015-12-11" {
description
"Initial revision.
NOTE TO RFC EDITOR: Please replace the following reference
to draft-ietf-i2rs-yang-l3-topology-01 with
RFC number when published (i.e. RFC xxxx).";
reference
"draft-ietf-i2rs-yang-l3-topology-01";
}
typedef iso-system-id {
type string {
pattern '[0-9a-fA-F]{4}(\.[0-9a-fA-F]{4}){2}';
}
description
"ISO System ID. RFC 1237";
}
typedef iso-pseudonode-id {
type string {
pattern '[0-9a-fA-F]{2}';
}
description
"ISO pseudonode id for broadcast network";
}
typedef iso-net-id {
type string {
pattern '[0-9a-fA-F]{2}((\.[0-9a-fA-F]{4}){6})';
}
description
"ISO NET ID. RFC 1237";
}
grouping isis-topology-type {
description
"Identifies the ISIS topology type.";
container isis {
presence "Indicates ISIS Topology";
description
"Its presence identifies the ISIS topology type.";
}
}
augment "/nw:networks/nw:network/nw:network-types/"
+"l3t:l3-unicast-igp-topology" {
description
"Defines the ISIS topology type.";
uses isis-topology-type;
}
augment "/nw:networks/nw:network/l3t:igp-topology-attributes" {
when "../nw:network-types/l3t:l3-unicast-igp-topology/isis" {
description
"Augment only for ISIS topology";
}
description
"Augment topology configuration";
container isis-topology-attributes {
description
"Containing topology attributes";
leaf net {
type iso-net-id;
description
"ISO NET ID value";
}
}
}
augment "/nw:networks/nw:network/nw:node/"+
"l3t:igp-node-attributes" {
when "../../nw:network-types/l3t:l3-unicast-igp-topology/isis" {
description
"Augment only for ISIS topology";
}
description
"Augment node configuration";
uses isis-node-attributes;
}
augment "/nw:networks/nw:network/nt:link/l3t:igp-link-attributes" {
when "../../nw:network-types/l3t:l3-unicast-igp-topology/isis" {
description
"Augment only for ISIS topology";
}
description
"Augment link configuration";
uses isis-link-attributes;
}
grouping isis-node-attributes {
description
"ISIS node scope attributes";
container isis-node-attributes {
description
"Containing node attributes";
container iso {
description
"Containing ISO atrributes";
leaf iso-system-id {
type iso-system-id;
description
"ISO system ID";
}
leaf iso-pseudonode-id {
type iso-pseudonode-id;
default "00";
description
"Pseudonode ID";
}
}
leaf-list net {
type iso-net-id;
max-elements 3;
description
"List of ISO NET IDs";
}
leaf-list multi-topology-id {
type uint8 {
range "0..127";
}
max-elements "128";
description
"List of Multi Topology Identifier upto 128 (0-127).
RFC 4915";
}
choice router-type {
description
"Indicates router type";
case level-2 {
leaf level-2 {
type empty;
description
"Level-2 only";
}
}
case level-1 {
leaf level-1 {
type empty;
description
"Level-1 only";
}
}
case level-1-2 {
leaf level-1-2 {
type empty;
description
"Level-1 and Level-2";
}
}
}
}
}
grouping isis-link-attributes {
description
"ISIS link scope attributes";
container isis-link-attributes {
description
"Containing link attributes";
leaf multi-topology-id {
type uint8 {
range "0..127";
}
description
"Multi topology ID";
}
}
}
augment "/l3t:igp-node-event" {
description
"ISIS node event";
uses isis-topology-type;
uses isis-node-attributes;
}
augment "/l3t:igp-link-event" {
description
"ISIS link event";
uses isis-topology-type;
uses isis-link-attributes;
}
}
<CODE ENDS>
The transport protocol used for sending the topology data MUST support authentication and SHOULD support encryption. The data-model by itself does not create any security implications.
The model presented in this paper was contributed to by more people than can be listed on the author list. Additional contributors include:
We wish to acknowledge the helpful contributions, comments, and suggestions that were received from Ladislav Lhotka, Andy Bierman, Carlos Pignataro, Joel Halpern, Juergen Schoenwaelder, Alia Atlas, and Susan Hares.
| [I-D.draft-ietf-i2rs-yang-network-topo] | Clemm, A., Medved, J., Tkacik, T., Varga, R., Bahadur, N. and H. Ananthakrishnan, "A YANG Data Model for Network Topologies", I-D draft-ietf-i2rs-yang-network-topo-02, December 2015. |
| [I-D.draft-ietf-netconf-restconf] | Bierman, A., Bjorklund, M. and K. Watsen, "RESTCONF Protocol", I-D draft-ietf-netconf-restconf-08, October 2015. |
| [I-D.draft-ietf-netmod-rfc6020bis-09] | Bjorklund, M., "The YANG 1.1 Data Modeling Language", I-D draft-ietf-netmod-rfc6020bis-09, December 2015. |
| [I-D.draft-ietf-netmod-yang-json] | Lhotka, L., "JSON Encoding of Data Modeled with YANG", I-D draft-ietf-netmod-yang-json-06, October 2015. |
| [RFC1195] | Callon, R., "Use of OSI IS-IS for Routing in TCP/IP and Dual Environments", RFC 1195, December 1990. |
| [RFC2178] | Moy, J., "OSPF Version 2", RFC 2178, July 1997. |
| [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. |
| [RFC6991] | Schoenwaelder, J., "Common YANG Data Types", RFC 6991, July 2013. |
| [RFC7223] | Bjorklund, M., "A YANG Data Model for Interface Management", RFC 7223, May 2014. |
| [I-D.draft-ietf-i2rs-usecase-reqs-summary] | Hares, S. and M. Chen, "Summary of I2RS Use Case Requirements", I-D draft-ietf-i2rs-usecase-reqs-summary-01, May 2015. |