NETMOD L. Lhotka
Internet-Draft CZ.NIC
Intended status: Standards Track February 20, 2012
Expires: August 23, 2012
A YANG Data Model for Routing Configuration
draft-ietf-netmod-routing-cfg-02
Abstract
This document contains a specification of four YANG modules.
Together they form the core routing data model which serves as a
basis for configuring a routing subsystem. It is therefore expected
that this module will be augmented by additional YANG modules
defining data models for individual routing protocols and other
related functions. The core routing data model provides common
building blocks for such configurations - router instances, routes,
routing tables, routing protocols and route filters.
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
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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 August 23, 2012.
Copyright Notice
Copyright (c) 2012 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
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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 . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology and Notation . . . . . . . . . . . . . . . . . . . 4
2.1. Glossary of New Terms . . . . . . . . . . . . . . . . . . 4
2.2. Prefixes in Data Node Names . . . . . . . . . . . . . . . 5
3. Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. The Design of the Core Routing Data Model . . . . . . . . . . 7
4.1. Router . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.1. Configuration of IPv6 Router Interfaces . . . . . . . 10
4.2. Route . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3. Routing Tables . . . . . . . . . . . . . . . . . . . . . . 12
4.4. Routing Protocols . . . . . . . . . . . . . . . . . . . . 13
4.4.1. Defining New Routing Protocols . . . . . . . . . . . . 14
4.5. Route Filters . . . . . . . . . . . . . . . . . . . . . . 17
4.6. RPC Operation . . . . . . . . . . . . . . . . . . . . . . 18
5. IANA AFN and SAFI YANG Module . . . . . . . . . . . . . . . . 19
6. Routing YANG Module . . . . . . . . . . . . . . . . . . . . . 27
7. IPv4 Unicast Routing YANG Module . . . . . . . . . . . . . . . 37
8. IPv6 Unicast Routing YANG Module . . . . . . . . . . . . . . . 41
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 49
10. Security Considerations . . . . . . . . . . . . . . . . . . . 51
11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 52
12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.1. Normative References . . . . . . . . . . . . . . . . . . . 53
12.2. Informative References . . . . . . . . . . . . . . . . . . 53
Appendix A. Example: Adding a New Routing Protocol . . . . . . . 54
Appendix B. Example: Reply to the NETCONF <get> Message . . . . . 57
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 63
C.1. Changes Between Versions -01 and -02 . . . . . . . . . . . 63
C.2. Changes Between Versions -00 and -01 . . . . . . . . . . . 63
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 64
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1. Introduction
This document contains a specification of four YANG modules:
o Module "ietf-routing" provides generic components of a routing
data model.
o Module "ietf-ipv4-unicast-routing" augments the "ietf-routing"
module with additional data specific to IPv4 unicast.
o Module "ietf-ipv6-unicast-routing" augments the "ietf-routing"
module with additional data specific to IPv6 unicast, including
the configuration variables required by [RFC4861].
o Module "iana-afn-safi" contains two type definitions translating
IANA registries "Address Family Numbers" [IANA-AFN] and
"Subsequent Address Family Identifiers" [IANA-SAFI] to YANG
enumerations.
The first three modules together define the so-called core routing
data model. This data model will serve as a basis for the
development of data models for more sophisticated routing
configurations. While these three modules can be directly used for
simple IP devices with static routing, their main purpose is to
provide essential building blocks for more complicated setups
involving multiple routing protocols, multicast routing, additional
address families, advanced functions such as route filtering or
policy routing etc. To this end, it is expected that the core
routing data model will be augmented by numerous modules developed by
other IETF working groups.
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2. Terminology and Notation
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].
The following terms are defined in [RFC6241]:
o client
o message
o operation
o server
The following terms are defined in [RFC6020]:
o augment
o configuration data
o container
o data model
o data node
o data type
o identity
o mandatory node
o module
o operational state data
o prefix
o RPC operation
2.1. Glossary of New Terms
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active route: a route which is actually used for packet forwarding.
If there are multiple candidate routes with a matching destination
prefix, then it is up to the routing algorithm to select the
active route.
core routing data model: YANG data model resulting from the
combination of "ietf-routing", "ietf-ipv4-unicast-routing-cfg" and
"ietf-ipv6-unicast-routing-cfg" modules.
direct route: a route to a directly connected network.
2.2. Prefixes in Data Node Names
In this document, names of data nodes are used mostly without a
prefix, as long as it is clear from the context in which YANG module
each name is defined. Otherwise, names are prefixed with their
standard prefix associated with the corresponding YANG module, as
shown in Table 1.
+--------+---------------------------+------------+
| Prefix | YANG module | Reference |
+--------+---------------------------+------------+
| eth | ex-ethernet | [YANG-IF] |
| | | |
| if | ietf-interfaces | [YANG-IF] |
| | | |
| ip | ietf-ip | [YANG-IP] |
| | | |
| rip | example-rip | Appendix A |
| | | |
| rt | ietf-routing | Section 6 |
| | | |
| v4ur | ietf-ipv4-unicast-routing | Section 7 |
| | | |
| v6ur | ietf-ipv6-unicast-routing | Section 8 |
| | | |
| yang | ietf-yang-types | [RFC6021] |
| | | |
| inet | ietf-inet-types | [RFC6021] |
+--------+---------------------------+------------+
Table 1: Prefixes and corresponding YANG modules
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3. Objectives
The initial design of the core routing data model was driven by the
following objectives:
o The data model should be suitable for the common address families,
in particular IPv4 and IPv6, and for unicast and multicast
routing, as well as Multiprotocol Label Switching (MPLS).
o Simple routing setups, such as static routing, should be
configurable in a simple way, ideally without any need to develop
additional YANG modules.
o On the other hand, the core routing framework must allow for
complicated setups involving multiple routing tables and multiple
routing protocols, as well as controlled redistributions of
routing information.
o Device vendors will want to map the data models built on this
generic framework to their proprietary data models and
configuration interfaces. Therefore, the framework should be
flexible enough to facilitate such a mapping and accommodate data
models with different logic.
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4. The Design of the Core Routing Data Model
The core routing data model consists of three YANG modules. The
first module, "ietf-routing", defines the generic components of a
routing system. The other two modules, "ietf-ipv4-unicast-routing"
and "ietf-ipv6-unicast-routing", augment the "ietf-routing" module
with additional data nodes that are needed for IPv4 and IPv6 unicast
routing, respectively. The combined data hierarchy is shown in
Figure 1, where brackets contain list keys and question marks
indicate optional data nodes. Nodes that represent configuration are
labeled with "rw" while operational state data have the "ro" label.
+--rw routing
+--rw router [name]
+--rw name
+--rw description?
+--rw enabled?
+--rw interfaces
| +--rw interface [name]
| +--rw name
| +--rw v6ur:ipv6-router-advertisements
| +--rw v6ur:send-advertisements?
| +--rw v6ur:max-rtr-adv-interval?
| +--rw v6ur:min-rtr-adv-interval?
| +--rw v6ur:managed-flag?
| +--rw v6ur:other-config-flag?
| +--rw v6ur:link-mtu?
| +--rw v6ur:reachable-time?
| +--rw v6ur:retrans-timer?
| +--rw v6ur:cur-hop-limit?
| +--rw v6ur:default-lifetime?
| +--rw v6ur:prefix-list
| +--rw v6ur:prefix [seqno]
| +--rw v6ur:seqno
| +--rw v6ur:prefix-spec?
| +--rw v6ur:valid-lifetime?
| +--rw v6ur:on-link-flag?
| +--rw v6ur:preferred-lifetime?
| +--rw v6ur:autonomous-flag?
+--rw routing-protocols
| +--rw routing-protocol [name]
| +--rw name
| +--rw description?
| +--rw type
| +--rw connected-routing-tables
| | +--rw routing-table [name]
| | +--rw name
| | +--rw import-filter?
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| | +--rw export-filter?
| +--rw static-routes
| +--rw v4ur:ipv4
| | +--rw v4ur:route [seqno]
| | +--rw v4ur:seqno
| | +--rw v4ur:description?
| | +--rw v4ur:outgoing-interface?
| | +--rw v4ur:dest-prefix?
| | +--rw v4ur:next-hop?
| +--rw v6ur:ipv6
| +--rw v6ur:route [seqno]
| +--rw v6ur:seqno
| +--rw v6ur:description?
| +--rw v6ur:outgoing-interface?
| +--rw v6ur:dest-prefix?
| +--rw v6ur:next-hop?
+--rw route-filters
| +--rw route-filter [name]
| +--rw name
| +--rw description?
| +--rw type?
+--rw routing-tables
+--rw routing-table [name]
+--rw name
+--rw address-family?
+--rw safi?
+--rw description?
+--ro routes
| +--ro route
| +--ro source-protocol?
| +--ro last-modified?
| +--ro v4ur:outgoing-interface?
| +--ro v4ur:dest-prefix?
| +--ro v4ur:next-hop?
| +--ro v6ur:outgoing-interface?
| +--ro v6ur:dest-prefix?
| +--ro v6ur:next-hop?
+--rw recipient-routing-tables [recipient-name]
+--rw recipient-name
+--rw filter?
Figure 1: Data hierarchy of the core routing data model.
As can be seen from Figure 1, the core routing data model introduces
several generic components of a routing framework: routers, routing
tables containing routes, routing protocols, route filters and RPC
operations. The following subsections describe these components in
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more detail.
By combining the components in various ways, and possibly augmenting
them with appropriate contents defined in other modules, various
routing setups can be realized.
+--------+ +------------+
| direct | +---+ | |
| routes |--->| F |--->| FIB |
+--------+ +---+ | |
+------------+
^
|
+---+
| F |
+---+
^
|
+--------------+ +---+ +--------------+
+--------+ | |<---| F |<---| |
| static | +---+ | main | +---+ | additional |
| routes |--->| F |--->| routing | | routing |
+--------+ +---+ | table | +---+ | table |
| |--->| F |--->| |
+--------------+ +---+ +--------------+
^ | ^ |
| v | v
+---+ +---+ +---+ +---+
| F | | F | | F | | F |
+---+ +---+ +---+ +---+
^ | ^ |
| v | v
+----------+ +----------+
| routing | | routing |
| protocol | | protocol |
+----------+ +----------+
Figure 2: Example setup of the routing subsystem
The example in Figure 2 shows a typical (though certainly not the
only possible) organization of a more complex routing subsystem.
Several of its features are worth mentioning:
o Along with the main routing table, which must always be present,
an additional routing table is configured.
o Each routing protocol instance, including the "static" and
"direct" pseudo-protocols, is connected to exactly one routing
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table with which it can exchange routes (in both directions,
except for the "static" and "direct" pseudo-protocols).
o Routing tables may also be connected to each other and exchange
routes in either direction (or both).
o The forwarding information base (FIB) is a special routing table
which must always be present. Typically, the FIB contains the
"direct" routes for all configured interfaces and also receives
the active routes from the main routing table. The operating
system kernel uses this information for packet forwarding.
o Route exchanges along all connections may be controlled by means
of route filters, denoted by "F" in Figure 2.
4.1. Router
Each router instance in the core routing data model represents a
(logical) router whose configuration and operation is independent of
other router instances. Although it it not enforced by the data
model, different router instances normally do not internally share
any data. They may, however, communicate with each other via routing
protocols.
Logical network interfaces must be assigned to a router instance in
order to be able to participate in packet forwarding, routing
protocols and other operations of that router instance. The
assignment is accomplished by creating a corresponding entry in the
list of router interfaces ("/router/interfaces/interface"). The key
of the list entry MUST be the name of a configured logical interface.
A logical interface MUST NOT be assigned to more than one router
instance.
Apart from the key, each entry of the "/router/interfaces/interface"
list MAY contain other configuration or operational state data
related to the corresponding logical interface.
4.1.1. Configuration of IPv6 Router Interfaces
The module "ietf-ipv6-unicast-routing" augments the definition of the
data node "/router/interfaces/interface" with definitions of the
following configuration variables as required by [RFC4861], sec.
6.2.1:
o send-advertisements,
o max-rtr-adv-interval,
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o min-rtr-adv-interval,
o managed-flag,
o other-config-flag,
o link-mtu,
o reachable-time,
o retrans-timer,
o cur-hop-limit,
o default-lifetime,
o prefix-list: a list of prefixes to be advertised. The following
parameters are associated with each prefix in the list:
* valid-lifetime,
* on-link-flag,
* preferred-lifetime,
* autonomous-flag.
The definitions and descriptions of the above parameters can be found
in the text of the module "ietf-ipv6-unicast-routing" (Section 8).
NOTE: The "IsRouter" flag, which is also required by [RFC4861], was
omitted. Is is expected that this variable will be implemented in
another module, either "ietf-interfaces" or "ietf-ip".
4.2. Route
Routes are basic units of information in a routing system. The core
routing data model defines only the following minimal set of route
attributes:
o destination-prefix - IP prefix specifying the set of destination
addresses for which the route may be used. This attribute is
mandatory.
o next-hop - IP address of the adjacent router or host to which
packets with destination addresses belonging to destination-prefix
should be sent.
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o outgoing-interface - network interface that should be used for
sending packets with destination addresses belonging to
destination-prefix.
The above list of route attributes is sufficient for a simple static
routing configuration. It is expected that future modules defining
routing protocols will add other route attributes such as metrics or
preferences.
Routes and their attributes are used in both configuration data, for
example as manually configured static routes, and in operational
state data, for example as entries in routing tables.
4.3. Routing Tables
Routing tables are lists of routes complemented with administrative
data, namely:
o source-protocol - name of the routing protocol from which the
route was originally obtained.
o last-modified - date and time of last modification, or
installation, of the route.
Each routing table may only contain routes of the same address family
(AFN and SAFI).
In the core routing data model, the "routing-table" node represents
configuration while the descendant list of routes is defined as
operational state data. The contents of such lists are controlled by
routing protocol operations which may result in route additions,
removals and modifications. This also includes manipulations via the
"static" pseudo-protocol.
At least the following two routing tables MUST be configured for each
router instance and each supported AFN/SAFI pair:
1. Forwarding information base (FIB) contains active routes that are
used by the operating system kernel for forwarding datagrams.
2. Main routing table to which all routing protocol instances are
connected by default, with the exception of the "direct" pseudo-
protocol (Section 4.4): direct routes only appear in the FIB
table by default.
The main routing table SHOULD serve as the default source of active
routes for the FIB.
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One or more additional routing tables MAY be configured by creating
new entries in the "routing-table" list, either being a part of
factory-default configuration or configured by the client.
The naming scheme for routing tables, as well as restrictions on the
number and configurability of routing tables are implementation-
specific.
Every routing table can serve as a source of routes for other routing
tables. To achieve this, one or more recipient routing tables may be
specified in the configuration of the source routing table. In
addition, a route filter may be configured for each recipient routing
table, which selects and/or manipulates the routes that are passed on
between the source and recipient routing table.
4.4. Routing Protocols
The core routing data model provides an open-ended framework for
defining multiple routing protocol instances. Each of them is
identified by a name, which MUST be unique within a router instance.
Each protocol MUST be assigned a type, which MUST be an identity
derived from the "rt:routing-protocol" base identity. The core
routing data model defines two identities for the "direct" and
"static" pseudo-protocols.
Each routing protocol instance is connected to exactly one routing
table. By default, every routing protocol instance SHOULD be
connected to the main routing table. An implementation MAY allow any
or all routing protocol instances to be configured to use a different
routing table.
Routes learned from the network by a routing protocol are passed to
the connected routing table and vice versa - routes appearing in a
routing table are passed to all routing protocols connected to the
table (except "direct" and "static" pseudo-protocols) and advertised
by that protocol to the network.
Two independent route filters (see Section 4.5) may be defined for a
routing protocol instance to control the exchange of routes in both
directions between the routing protocol instance and the connected
routing table:
o import filter controls which routes are passed from a routing
protocol instance to the routing table,
o export filter controls which routes the routing protocol instance
may receive from the connected routing table.
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Note that, for historical reasons, the terms import and export are
used from the viewpoint of a routing table.
The core routing data model defines two special routing protocols -
"direct" and "static". Both are in fact pseudo-protocols, which
means that they are confined to the local device and do not exchange
any routing information with neighboring routers. Routes from both
"direct" and "static" protocol instances are passed to the connected
routing table (subject to route filters, if any), but an exchange in
the opposite direction is not allowed.
Every router instance MUST contain exactly one instance of the
"direct" pseudo-protocol. It is the source of direct routes which
are normally supplied by the operating system kernel, based on the
detected and configured network interfaces, and they SHOULD by
default appear in the FIB routing table. However, using the
framework defined in this document, the target routing table for
direct routes MAY be changed by connecting the "direct" protocol
instance to a non-default routing table. Direct routes can also be
filtered before they appear in the routing table.
The "static" routing pseudo-protocol allows for specifying routes
manually. It MAY be configured in zero or multiple instances,
although a typical implementation will have exactly one instance per
router.
4.4.1. Defining New Routing Protocols
It is expected that future YANG modules will create data models for
additional routing protocol types. In order to do so, the new module
has to define the protocol-specific information and fit it into the
core routing framework in the following way :
o A new identity MUST be defined for the routing protocol and its
base identity MUST be set to "rt:routing-protocol", or to an
identity derived from "rt:routing-protocol".
o Additional route attributes MAY be defined. Their definitions
then have to be inserted as operational state data by augmenting
the definition of "rt:route" inside "rt:routing-table", and
possibly to other places in the configuration, operational state
data and RPC input or output.
o Per-interface configuration parameters can be added by augmenting
the data node "rt:interface" (the list of router interfaces).
o Other configuration parameters can be defined by augmenting the
"routing-protocol" data node. By using the "when" statement, this
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augment SHOULD be made conditional and valid only if the value of
the "rt:type" child leaf equals to the new protocol's identity.
It is recommended that both per-interface and other configuration
data specific to the new protocol be encapsulated in an appropriately
named container.
The above steps are implemented by the example YANG module for the
RIP routing protocol in Appendix A. First, the module defines a new
identity for the RIP protocol:
identity rip {
base rt:routing-protocol;
description "Identity for the RIP routing protocol.";
}
New route attributes specific to the RIP protocol ("metric" and
"tag") are defined in a grouping and then added to the route
definitions appearing in "routing-table" and in the output part of
the "get-route" RPC method:
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grouping route-content {
description
"RIP-specific route content.";
leaf metric {
type rip-metric;
}
leaf tag {
type uint16;
default "0";
description
"This leaf may be used to carry additional info, e.g. AS
number.";
}
}
augment "/rt:routing/rt:router/rt:routing-tables/rt:routing-table/"
+ "rt:routes/rt:route" {
when "../../../../rt:routing-protocols/"
+ "rt:routing-protocol[rt:name=current()/rt:source-protocol]/"
+ "rt:type='rip:rip'" {
description
"This augment is only valid if the source protocol from which
the route originated is RIP.";
}
description
"RIP-specific route components.";
uses route-content;
}
augment "/rt:get-route/rt:output/rt:route" {
description
"Add RIP-specific route content.";
uses route-content;
}
Per-interface configuration data are defined by the following
"augment" statement:
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augment "/rt:routing/rt:router/rt:interfaces/rt:interface" {
when "../../rt:routing-protocols/rt:routing-protocol/rt:type = "
+ "'rip:rip'";
container rip {
description
"Per-interface RIP configuration.";
leaf enabled {
type boolean;
default "true";
}
leaf metric {
type rip-metric;
default "1";
}
}
}
Finally, global RIP configuration data are integrated into the "rt:
routing-protocol" node by using the following "augment" statement,
which is valid only for routing protocol instances whose type is
"rip:rip":
augment "/rt:routing/rt:router/rt:routing-protocols/"
+ "rt:routing-protocol" {
when "rt:type = 'rip:rip'";
container rip {
leaf update-interval {
type uint8 {
range "10..60";
}
units "seconds";
default "30";
description
"Time interval between periodic updates.";
}
}
}
4.5. Route Filters
The core routing data model provides a skeleton for defining route
filters that can be used to restrict the set of routes being
exchanged between a routing protocol instance and a connected routing
table, or between a source and a recipient routing table. Route
filters may also manipulate routes, i.e., add, delete, or modify
their properties.
By itself, the route filtering framework defined in this document
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allows to establish only the two extreme routing policies in which
either all routes are allowed or all routes are rejected. It is
expected that real route filtering frameworks will be developed
separately.
Each route filter is identified by a name which MUST be unique within
a router instance. Its type MUST be specified by the "type" identity
reference - this opens the space for multiple route filtering
framework implementations. The default value for route filter type
is the identity "deny-all-route-filter" defined in the "ietf-routing"
module, which represents a route filtering policy in which all routes
are rejected.
4.6. RPC Operation
The "ietf-routing" module defines the "get-route" RPC operation. It
is used for querying the forwarding information base of a router
instance. The first input parameter is the name of the router
instance whose FIB is to be queried, and the second parameter is a
destination address. Modules for particular address families are
expected to augment the "destination-address" container with the
"address" leaf, as it is done in the "ietf-ipv4-unicast-routing" and
"ietf-ipv6-unicast-routing" modules.
The server replies with an active route which is used for forwarding
datagrams to the destination address within the selected router
instance. Again, modules for particular address families are
expected to augment the definition of output parameters with AFN/
SAFI-specific contents.
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5. IANA AFN and SAFI YANG Module
RFC Ed.: In this section, replace all occurrences of 'XXXX' with the
actual RFC number and all occurrences of the revision date below with
the date of RFC publication (and remove this note).
<CODE BEGINS> file "iana-afn-safi@2012-02-20.yang"
module iana-afn-safi {
namespace "urn:ietf:params:xml:ns:yang:iana-afn-safi";
prefix "ianaaf";
organization
"IANA";
contact
"Internet Assigned Numbers Authority
Postal:
ICANN
4676 Admiralty Way, Suite 330
Marina del Rey, CA 90292
U. S. A.
Tel: +1 310 823 9358
E-Mail: iana&iana.org
";
description
"This YANG module provides two typedefs containing YANG
definitions for the following IANA-registered enumerations:
- Address Family Numbers (AFN)
- Subsequent Address Family Identifiers (SAFI)
The latest revision of this YANG module can be obtained from the
IANA web site.
Copyright (c) 2012 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
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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 RFC XXXX; see the
RFC itself for full legal notices.
";
revision 2012-02-20 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
typedef address-family {
type enumeration {
enum other {
value "0";
description
"none of the following";
}
enum ipV4 {
value "1";
description
"IP Version 4";
}
enum ipV6 {
value "2";
description
"IP Version 6";
}
enum nsap {
value "3";
description
"NSAP";
}
enum hdlc {
value "4";
description
"(8-bit multidrop)";
}
enum bbn1822 {
value "5";
description
"BBN Report 1822";
}
enum all802 {
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value "6";
description
"(includes all 802 media plus Ethernet 'canonical
format')";
}
enum e163 {
value "7";
description
"E.163";
}
enum e164 {
value "8";
description
"(SMDS, FrameRelay, ATM)";
}
enum f69 {
value "9";
description
"(Telex)";
}
enum x121 {
value "10";
description
"(X.25, Frame Relay)";
}
enum ipx {
value "11";
description
"IPX (Internet Protocol Exchange)";
}
enum appleTalk {
value "12";
description
"Apple Talk";
}
enum decnetIV {
value "13";
description
"DEC Net Phase IV";
}
enum banyanVines {
value "14";
description
"Banyan Vines";
}
enum e164withNsap {
value "15";
description
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"(E.164 with NSAP format subaddress)";
}
enum dns {
value "16";
description
"(Domain Name System)";
}
enum distinguishedName {
value "17";
description
"(Distinguished Name, per X.500)";
}
enum asNumber {
value "18";
description
"(16-bit quantity, per the AS number space)";
}
enum xtpOverIPv4 {
value "19";
description
"XTP over IP version 4";
}
enum xtpOverIpv6 {
value "20";
description
"XTP over IP version 6";
}
enum xtpNativeModeXTP {
value "21";
description
"XTP native mode XTP";
}
enum fibreChannelWWPN {
value "22";
description
"Fibre Channel World-Wide Port Name";
}
enum fibreChannelWWNN {
value "23";
description
"Fibre Channel World-Wide Node Name";
}
enum gwid {
value "24";
description
"Gateway Identifier";
}
enum afi {
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value "25";
description
"AFI for L2VPN";
}
}
description
"This typedef is a YANG enumeration of IANA-registered address
family numbers (AFN).";
reference
"Address Family Numbers. IANA, 2011-01-20.
<http://www.iana.org/assignments/address-family-numbers/
address-family-numbers.xml>
IANA-ADDRESS-FAMILY-NUMBERS-MIB DEFINITIONS
<http://www.iana.org/assignments/ianaaddressfamilynumbers-mib>
";
}
typedef subsequent-address-family {
type enumeration {
enum nlri-unicast {
value "1";
description
"Network Layer Reachability Information used for unicast
forwarding";
reference
"RFC4760";
}
enum nlri-multicast {
value "2";
description
"Network Layer Reachability Information used for multicast
forwarding";
reference
"RFC4760";
}
enum nlri-mpls {
value "4";
description
"Network Layer Reachability Information (NLRI) with MPLS
Labels";
reference
"RFC3107";
}
enum mcast-vpn {
value "5";
description
"MCAST-VPN";
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reference
"draft-ietf-l3vpn-2547bis-mcast-bgp-08";
}
enum nlri-dynamic-ms-pw {
value "6";
status "obsolete";
description
"Network Layer Reachability Information used for Dynamic
Placement of Multi-Segment Pseudowires (TEMPORARY -
Expires 2008-08-23)";
reference
"draft-ietf-pwe3-dynamic-ms-pw-13";
}
enum tunnel-safi {
value "64";
description
"Tunnel SAFI";
reference
"draft-nalawade-kapoor-tunnel-safi-05";
}
enum vpls {
value "65";
description
"Virtual Private LAN Service (VPLS)";
reference
"RFC4761, RFC6074";
}
enum bgp-mdt {
value "66";
description
"BGP MDT SAFI";
reference
"RFC6037";
}
enum bgp-4over6 {
value "67";
description
"BGP 4over6 SAFI";
reference
"RFC5747";
}
enum bgp-6over4 {
value "68";
description
"BGP 6over4 SAFI";
reference
"mailto:cuiyong&tsinghua.edu.cn";
}
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enum l1vpn-auto-discovery {
value "69";
description
"Layer-1 VPN auto-discovery information";
reference
"draft-ietf-l1vpn-bgp-auto-discovery-05";
}
enum mpls-vpn {
value "128";
description
"MPLS-labeled VPN address";
reference
"RFC4364";
}
enum multicast-bgp-mpls-vpn {
value "129";
description
"Multicast for BGP/MPLS IP Virtual Private Networks
(VPNs)";
reference
"draft-ietf-l3vpn-2547bis-mcast-10,
draft-ietf-l3vpn-2547bis-mcast-10";
}
enum route-target-constraints {
value "132";
description
"Route Target constraints";
reference
"RFC4684";
}
enum ipv4-diss-flow {
value "133";
description
"IPv4 dissemination of flow specification rules";
reference
"RFC5575";
}
enum vpnv4-diss-flow {
value "134";
description
"IPv4 dissemination of flow specification rules";
reference
"RFC5575";
}
enum vpn-auto-discovery {
value "140";
description
"VPN auto-discovery";
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reference
"draft-ietf-l3vpn-bgpvpn-auto-09";
}
}
description
"This typedef is a YANG enumeration of IANA-registered
subsequent address family identifiers (SAFI).";
reference
"Subsequent Address Family Identifiers (SAFI) Parameters. IANA,
2011-03-04. <http://www.iana.org/assignments/safi-namespace/
safi-namespace.xml>
";
}
}
<CODE ENDS>
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6. Routing YANG Module
RFC Ed.: In this section, replace all occurrences of 'XXXX' with the
actual RFC number and all occurrences of the revision date below with
the date of RFC publication (and remove this note).
<CODE BEGINS> file "ietf-routing@2012-02-20.yang"
module ietf-routing {
namespace "urn:ietf:params:xml:ns:yang:ietf-routing";
prefix "rt";
import ietf-yang-types {
prefix "yang";
}
import ietf-interfaces {
prefix "if";
}
import iana-afn-safi {
prefix "ianaaf";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: David Kessens
<mailto:david.kessens@nsn.com>
WG Chair: Juergen Schoenwaelder
<mailto:j.schoenwaelder@jacobs-university.de>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
";
description
"This module contains YANG definitions of essential components
that may be used for configuring a routing subsystem.
Copyright (c) 2012 IETF Trust and the persons identified as
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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 RFC XXXX; see the
RFC itself for full legal notices.
";
revision 2012-02-20 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
/* Identities */
identity routing-protocol {
description
"Base identity from which routing protocol identities are
derived.";
}
identity direct {
base routing-protocol;
description
"Routing pseudo-protocol which provides routes to directly
connected networks.";
}
identity static {
base routing-protocol;
description
"Static routing pseudo-protocol.";
}
identity route-filter {
description
"Base identity from which all route filters are derived.";
}
identity deny-all-route-filter {
base route-filter;
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description
"Route filter that blocks all routes.";
}
/* Type Definitions */
typedef router-ref {
type leafref {
path "/rt:routing/rt:router/rt:name";
}
description
"This type is used for leafs that reference a router
instance.";
}
/* Groupings */
grouping afn-safi {
leaf address-family {
type ianaaf:address-family;
default "ipV4";
description
"Address family of routes in the routing table.";
}
leaf safi {
type ianaaf:subsequent-address-family;
default "nlri-unicast";
description
"Subsequent address family identifier of routes in the
routing table.";
}
description
"This grouping provides two parameters specifying address
family and subsequent address family.";
}
grouping route-content {
description
"Generic parameters of routes.
A module for an address family should define a specific
version of this grouping containing 'uses rt:route-content'.
";
leaf outgoing-interface {
type if:interface-ref;
description
"Outgoing interface.";
}
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}
/* RPC Methods */
rpc get-route {
description
"Query the forwarding information base of a router instance
whose name is given as the first parameter 'router-name'. The
second parameter 'destination-address' should be augmented in
order to support destination addresses of all supported
address families. The server returns the route which is
currently used for forwarding datagrams to that destination
address, or an error message, if no such route exists.";
input {
leaf router-name {
type router-ref;
mandatory "true";
description
"First parameter: name of the router instance whose
forwarding information base is queried.";
}
container destination-address {
uses afn-safi;
description
"Second parameter: destination address.
AFN/SAFI-specific modules must augment this container with
a leaf named 'address'.
";
}
}
output {
container route {
uses afn-safi;
description
"Contents of the reply specific for each address family
should be defined through augmenting.";
}
}
}
/* Data Nodes */
container routing {
description
"Routing parameters.";
list router {
key "name";
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unique "interfaces/interface/name";
description
"Each list entry is a container for configuration and
operational state data of a single (logical) router.";
leaf name {
type string;
description
"The unique router name.";
}
leaf description {
type string;
description
"Textual description of the router.";
}
leaf enabled {
type boolean;
default "true";
description
"Enable or disable the router. The default value is 'true',
which means that the router is enabled.";
}
container interfaces {
description
"Router interface parameters.";
list interface {
key "name";
description
"List of logical interfaces assigned to the router
instance. Any logical interface can only be assigned to
one router instance.";
leaf name {
type if:interface-ref;
description
"A reference to the name of a configured logical
interface.";
}
}
}
container routing-protocols {
description
"Container for the list of configured routing protocol
instances.";
list routing-protocol {
key "name";
description
"An instance of a routing protocol.";
leaf name {
type string;
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description
"The name of the routing protocol instance.";
}
leaf description {
type string;
description
"Textual description of the routing protocol
instance.";
}
leaf type {
type identityref {
base routing-protocol;
}
mandatory "true";
description
"Type of the routing protocol - an identity derived
from the 'routing-protocol' base identity.";
}
container connected-routing-tables {
description
"Container for connected routing tables.";
list routing-table {
must "not(../../../../routing-tables/"
+ "routing-table[current()/"
+ "preceding-sibling::routing-table/name]/"
+ "address-family=../../../../routing-tables/"
+ "routing-table[current()/name]/"
+ "address-family and ../../../../routing-tables/"
+ "routing-table[current()/"
+ "preceding-sibling::routing-table/name]/safi=../"
+ "../../../routing-tables/routing-table[current()/"
+ "name]/safi)" {
error-message
"Each routing protocol may have no more than one
connected routing table for each AFN and SAFI.";
description
"For each AFN/SAFI pair there may be at most one
connected routing table.";
}
key "name";
description
"List of routing tables to which the routing protocol
instance is connected.
Implementation may provide default routing tables
for some AFN/SAFI pairs, which are used if the
corresponding entry is not configured.
";
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leaf name {
type leafref {
path "../../../../../routing-tables/routing-table/"
+ "name";
}
description
"Reference to an existing routing table.";
}
leaf import-filter {
type leafref {
path "../../../../../route-filters/route-filter/"
+ "name";
}
description
"Reference to a route filter that is used for
filtering routes passed from this routing protocol
instance to the routing table specified by the
'name' sibling node. If this leaf is not present,
the behavior is protocol-specific, but typically
it means that all routes are accepted.";
}
leaf export-filter {
type leafref {
path "../../../../../route-filters/route-filter/"
+ "name";
}
description
"Reference to a route filter that is used for
filtering routes passed from the routing table
specified by the 'name' sibling node to this
routing protocol instance. If this leaf is not
present, the behavior is protocol-specific -
typically it means that all routes are accepted,
except for the 'direct' and 'static'
pseudo-protocols which accept no routes from any
routing table.";
}
}
}
container static-routes {
must "../type='static'" {
error-message
"Static routes may be configured only for 'static'
routing protocol.";
description
"This container is only valid for the 'static'
routing protocol.";
}
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description
"Configuration of 'static' pseudo-protocol.";
}
}
}
container route-filters {
description
"Container for configured route filters.";
list route-filter {
key "name";
description
"Route filters are used for filtering and/or manipulating
routes that are passed between a routing protocol and a
routing table or vice versa, or between two routing
tables. It is expected that other modules augment this
list with contents specific for a particular route
filter type.";
leaf name {
type string;
description
"The name of the route filter.";
}
leaf description {
type string;
description
"Textual description of the route filter.";
}
leaf type {
type identityref {
base route-filter;
}
default "deny-all-route-filter";
description
"Type of the route-filter - an identity derived from
the 'route-filter' base identity. The default value
represents an all-blocking filter.";
}
}
}
container routing-tables {
description
"Container for configured routing tables.";
list routing-table {
key "name";
description
"Each entry represents a routing table identified by the
'name' key. All routes in a routing table must have the
same AFN and SAFI.";
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leaf name {
type string;
description
"The name of the routing table.";
}
uses afn-safi;
leaf description {
type string;
description
"Textual description of the routing table.";
}
container routes {
config "false";
description
"Current contents of the routing table (operational
state data).";
list route {
description
"A routing table entry. This data node must augmented
with information specific for routes of each address
family.";
leaf source-protocol {
type leafref {
path "../../../../../routing-protocols/"
+ "routing-protocol/name";
}
description
"The name of the routing protocol instance from
which the route comes. This routing protocol must
be configured (automatically or manually) in the
device.";
}
leaf last-modified {
type yang:date-and-time;
description
"Time stamp of the last modification of the route.
If the route was never modified, it is the time
when the route was inserted to the routing
table.";
}
}
}
list recipient-routing-tables {
key "recipient-name";
description
"A list of routing tables that receive routes from this
routing table.";
leaf recipient-name {
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type leafref {
path "../../../routing-table/name";
}
description
"The name of the recipient routing table.";
}
leaf filter {
type leafref {
path "../../../../route-filters/route-filter/name";
}
description
"A route filter which is applied to the routes passed
on to the recipient routing table.";
}
}
}
}
}
}
}
<CODE ENDS>
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7. IPv4 Unicast Routing YANG Module
RFC Ed.: In this section, replace all occurrences of 'XXXX' with the
actual RFC number and all occurrences of the revision date below with
the date of RFC publication (and remove this note).
<CODE BEGINS> file "ietf-ipv4-unicast-routing@2012-02-20.yang"
module ietf-ipv4-unicast-routing {
namespace "urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing";
prefix "v4ur";
import ietf-routing {
prefix "rt";
}
import ietf-inet-types {
prefix "inet";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: David Kessens
<mailto:david.kessens@nsn.com>
WG Chair: Juergen Schoenwaelder
<mailto:j.schoenwaelder@jacobs-university.de>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
";
description
"This module augments the 'ietf-routing' module with YANG
definitions for basic configuration of IPv4 unicast routing.
Copyright (c) 2012 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
Lhotka Expires August 23, 2012 [Page 37]
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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 RFC XXXX; see the
RFC itself for full legal notices.
";
revision 2012-02-20 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
/* Groupings */
grouping route-content {
description
"Parameters of IPv4 unicast routes.";
uses rt:route-content;
leaf dest-prefix {
type inet:ipv4-prefix;
description
"IPv4 destination prefix.";
}
leaf next-hop {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
/* RPC Methods */
augment "/rt:get-route/rt:input/rt:destination-address" {
when "address-family='ipV4' and safi='nlri-unicast'" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"The 'address' leaf augments the 'rt:destination-address'
parameter of the 'rt:get-route' operation.";
leaf address {
type inet:ipv4-address;
description
"IPv4 destination address.";
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}
}
augment "/rt:get-route/rt:output/rt:route" {
when "address-family='ipV4' and safi='nlri-unicast'" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"Contents of the reply to 'rt:get-route' operation.";
uses route-content;
}
/* Data nodes */
augment "/rt:routing/rt:router/rt:routing-protocols/"
+ "rt:routing-protocol/rt:static-routes" {
description
"This augment defines the configuration of the 'static'
pseudo-protocol with data specific for IPv4 unicast.";
container ipv4 {
description
"Configuration of a 'static' pseudo-protocol instance
consists of a list of routes.";
list route {
key "seqno";
ordered-by "user";
description
"A user-ordered list of static routes.";
leaf seqno {
type uint16;
description
"Sequential number of the route.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
uses route-content;
}
}
}
augment "/rt:routing/rt:router/rt:routing-tables/rt:routing-table/"
+ "rt:routes/rt:route" {
when "../../rt:address-family='ipV4' and "
+ "../../rt:safi='nlri-unicast'" {
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description
"This augment is valid only for IPv4 unicast.";
}
description
"This augment defines the content of IPv4 unicast routes.";
uses route-content;
}
}
<CODE ENDS>
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8. IPv6 Unicast Routing YANG Module
RFC Ed.: In this section, replace all occurrences of 'XXXX' with the
actual RFC number and all occurrences of the revision date below with
the date of RFC publication (and remove this note).
<CODE BEGINS> file "ietf-ipv6-unicast-routing@2012-02-20.yang"
module ietf-ipv6-unicast-routing {
namespace "urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing";
prefix "v6ur";
import ietf-routing {
prefix "rt";
}
import ietf-inet-types {
prefix "inet";
}
import ietf-interfaces {
prefix "if";
}
import ietf-ip {
prefix "ip";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: David Kessens
<mailto:david.kessens@nsn.com>
WG Chair: Juergen Schoenwaelder
<mailto:j.schoenwaelder@jacobs-university.de>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
";
description
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"This module augments the 'ietf-routing' module with YANG
definitions for basic configuration of IPv6 unicast routing.
Copyright (c) 2012 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 RFC XXXX; see the
RFC itself for full legal notices.
";
revision 2012-02-20 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
/* Groupings */
grouping route-content {
description
"Specific parameters of IPv6 unicast routes.";
uses rt:route-content;
leaf dest-prefix {
type inet:ipv6-prefix;
description
"IPv6 destination prefix.";
}
leaf next-hop {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
/* RPC Methods */
augment "/rt:get-route/rt:input/rt:destination-address" {
when "address-family='ipV6' and safi='nlri-unicast'" {
description
"This augment is valid only for IPv6 unicast.";
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}
description
"The 'address' leaf augments the 'rt:destination-address'
parameter of the 'rt:get-route' operation.";
leaf address {
type inet:ipv6-address;
description
"IPv6 destination address.";
}
}
augment "/rt:get-route/rt:output/rt:route" {
when "address-family='ipV6' and safi='nlri-unicast'" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"Contents of the reply to 'rt:get-route' operation.";
uses route-content;
}
/* Data nodes */
augment "/rt:routing/rt:router/rt:interfaces/rt:interface" {
when "/if:interfaces/if:interface[name=current()/name] "
+ "/ip:ipv6/ip:enabled='true'" {
description
"This augment is only valid for router interfaces with
enabled IPv6.
NOTE: Parameter 'is-router' is not included, it is expected
that it will be implemented by the 'ietf-ip' module.
";
}
description
"IPv6-specific parameters of router interfaces.";
container ipv6-router-advertisements {
description
"Parameters of IPv6 Router Advertisements.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6).
RFC 4862: IPv6 Stateless Address Autoconfiguration.
";
leaf send-advertisements {
type boolean;
default "false";
description
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"A flag indicating whether or not the router sends periodic
Router Advertisements and responds to Router
Solicitations.";
}
leaf max-rtr-adv-interval {
type uint16 {
range "4..1800";
}
units "seconds";
default "600";
description
"The maximum time allowed between sending unsolicited
multicast Router Advertisements from the interface.";
}
leaf min-rtr-adv-interval {
type uint16 {
range "3..1350";
}
units "seconds";
description
"The minimum time allowed between sending unsolicited
multicast Router Advertisements from the interface.
Must be no greater than 0.75 * max-rtr-adv-interval.
Its default value is dynamic:
- if max-rtr-adv-interval >= 9 seconds, the default value
is 0.33 * max-rtr-adv-interval;
- otherwise it is max-rtr-adv-interval.
";
}
leaf managed-flag {
type boolean;
default "false";
description
"The boolean value to be placed in the 'Managed address
configuration' flag field in the Router Advertisement.";
}
leaf other-config-flag {
type boolean;
default "false";
description
"The boolean value to be placed in the 'Other
configuration' flag field in the Router Advertisement.";
}
leaf link-mtu {
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type uint32;
default "0";
description
"The value to be placed in MTU options sent by the router.
A value of zero indicates that no MTU options are sent.";
}
leaf reachable-time {
type uint32 {
range "0..3600000";
}
units "milliseconds";
default "0";
description
"The value to be placed in the Reachable Time field in the
Router Advertisement messages sent by the router. The
value zero means unspecified (by this router).";
}
leaf retrans-timer {
type uint32;
units "milliseconds";
default "0";
description
"The value to be placed in the Retrans Timer field in the
Router Advertisement messages sent by the router. The
value zero means unspecified (by this router).";
}
leaf cur-hop-limit {
type uint8;
default "64";
description
"The default value to be placed in the Cur Hop Limit field
in the Router Advertisement messages sent by the router.
The value should be set to the current diameter of the
Internet. The value zero means unspecified (by this
router).
The default should be set to the value specified in IANA
Assigned Numbers that was in effect at the time of
implementation.
";
reference
"IANA: IP Parameters,
http://www.iana.org/assignments/ip-parameters";
}
leaf default-lifetime {
type uint16 {
range "0..9000";
}
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units "seconds";
description
"The value to be placed in the Router Lifetime field of
Router Advertisements sent from the interface, in seconds.
MUST be either zero or between MaxRtrAdvInterval and 9000
seconds. A value of zero indicates that the router is not
to be used as a default router. These limits may be
overridden by specific documents that describe how IPv6
operates over different link layers.
The default value is dynamic and should be set to 3 *
max-rtr-adv-interval.
";
}
container prefix-list {
description
"A list of prefixes to be placed in Prefix Information
options in Router Advertisement messages sent from the
interface.
Default: all prefixes that the router advertises via
routing protocols as being on-link for the interface from
which the advertisement is sent. The link-local prefix
should not be included in the list of advertised prefixes.
";
list prefix {
key "seqno";
unique "prefix-spec";
description
"Advertised prefix entry.";
leaf seqno {
type uint8;
description
"Sequential number of the entry.";
}
leaf prefix-spec {
type inet:ipv6-prefix;
description
"IPv6 address prefix.";
}
leaf valid-lifetime {
type uint32;
units "seconds";
default "2592000";
description
"The value to be placed in the Valid Lifetime in the
Prefix Information option, in seconds. The designated
value of all 1's (0xffffffff) represents infinity.
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Implementations may allow valid-lifetime to be
specified in two ways:
1. a time that decrements in real time, that is, one
that will result in a Lifetime of zero at the
specified time in the future,
2. a fixed time that stays the same in consecutive
advertisements.
";
}
leaf on-link-flag {
type boolean;
default "true";
description
"The value to be placed in the on-link flag ('L-bit')
field in the Prefix Information option.";
}
leaf preferred-lifetime {
type uint32;
units "seconds";
default "604800";
description
"The value to be placed in the Preferred Lifetime in
the Prefix Information option, in seconds. The
designated value of all 1's (0xffffffff) represents
infinity.
Implementations MAY allow AdvPreferredLifetime to be
specified in two ways:
1. a time that decrements in real time, that is, one
that will result in a Lifetime of zero at a
specified time in the future,
2. a fixed time that stays the same in consecutive
advertisements.
";
}
leaf autonomous-flag {
type boolean;
default "true";
description
"The value to be placed in the Autonomous Flag field in
the Prefix Information option.";
}
}
}
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}
}
augment "/rt:routing/rt:router/rt:routing-protocols/"
+ "rt:routing-protocol/rt:static-routes" {
description
"This augment defines the configuration of the 'static'
pseudo-protocol with data specific for IPv6 unicast.";
container ipv6 {
description
"Configuration of a 'static' pseudo-protocol instance
consists of a list of routes.";
list route {
key "seqno";
ordered-by "user";
description
"A user-ordered list of static routes.";
leaf seqno {
type uint16;
description
"Sequential number of the route.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
uses route-content;
}
}
}
augment "/rt:routing/rt:router/rt:routing-tables/rt:routing-table/"
+ "rt:routes/rt:route" {
when "../../rt:address-family='ipV6' and "
+ "../../rt:safi='nlri-unicast'" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"This augment defines the content of IPv6 unicast routes.";
uses route-content;
}
}
<CODE ENDS>
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9. IANA Considerations
RFC Ed.: In this section, replace all occurrences of 'XXXX' with the
actual RFC number (and remove this note).
This document registers the following namespace URIs in the IETF XML
registry [RFC3688]:
----------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-routing
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
----------------------------------------------------------
----------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
----------------------------------------------------------
----------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
----------------------------------------------------------
----------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:iana-afn-safi
Registrant Contact: IANA.
XML: N/A, the requested URI is an XML namespace.
----------------------------------------------------------
This document registers the following YANG modules in the YANG Module
Names registry [RFC6020]:
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-------------------------------------------------------------------
name: ietf-routing
namespace: urn:ietf:params:xml:ns:yang:ietf-routing
prefix: rt
reference: RFC XXXX
-------------------------------------------------------------------
-------------------------------------------------------------------
name: ietf-ipv4-unicast-routing
namespace: urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing
prefix: v4ur
reference: RFC XXXX
-------------------------------------------------------------------
-------------------------------------------------------------------
name: ietf-ipv6-unicast-routing
namespace: urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing
prefix: v6ur
reference: RFC XXXX
-------------------------------------------------------------------
-------------------------------------------------------------------
name: iana-afn-safi
namespace: urn:ietf:params:xml:ns:yang:iana-afn-safi
prefix: ianaaf
reference: RFC XXXX
-------------------------------------------------------------------
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10. Security Considerations
The YANG modules defined in this document are designed to be accessed
via the NETCONF protocol [RFC6241]. The lowest NETCONF layer is the
secure transport layer and the mandatory-to-implement secure
transport is SSH [RFC6242].
A number of data nodes defined in the YANG modules are writable/
creatable/deletable (i.e., "config true" in YANG terms, which is the
default). These data nodes may be considered sensitive or vulnerable
in some network environments. Write operations to these data nodes,
such as "edit-config", can have negative effects on the network if
the operations are not properly protected.
The vulnerable "config true" subtrees and data nodes are the
following:
/rt:routing/rt:router/rt:interfaces/rt:interface This list assigns a
logical interface to a router instance and may also specify
interface parameters related to routing.
/rt:routing/rt:router/rt:routing-protocols/rt:routing-protocol This
list specifies the routing protocols configured on a device.
/rt:routing/rt:router/rt:route-filters/rt:route-filter This list
specifies the configured route filters which represent the
administrative policies for redistributing and modifying routing
information.
Unauthorized access to any of these lists can adversely affect the
routing subsystem of both the local device and the network. This may
lead to network malfunctions, delivery of packets to inappropriate
destinations and other problems.
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11. Acknowledgments
The author wishes to thank Martin Bjorklund, Joel Halpern, Tom Petch
and Juergen Schoenwaelder for their helpful comments and suggestions.
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12. References
12.1. Normative References
[IANA-AFN]
IANA, "Address Family Numbers.", January 2011.
[IANA-SAFI]
IANA, "Subsequent Address Family Identifiers (SAFI)
Parameters.", March 2011.
[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.
[RFC4861] Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
"Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
September 2007.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
Network Configuration Protocol (NETCONF)", RFC 6020,
September 2010.
[RFC6021] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6021, September 2010.
[RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
Bierman, "NETCONF Configuration Protocol", RFC 6241,
June 2011.
[YANG-IF] Bjorklund, M., "A YANG Data Model for Interface
Configuration", draft-ietf-netmod-interfaces-cfg-03 (work
in progress), February 2012.
[YANG-IP] Bjorklund, M., "A YANG Data Model for IP Configuration",
draft-ietf-netmod-ip-cfg-02 (work in progress),
February 2012.
12.2. Informative References
[RFC6087] Bierman, A., "Guidelines for Authors and Reviewers of YANG
Data Model Documents", RFC 6087, January 2011.
[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, June 2011.
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Appendix A. Example: Adding a New Routing Protocol
This appendix demonstrates how the core routing data model can be
extended to support a new routing protocol. The YANG module
"example-rip" shown below is intended only as an illustration rather
than a real definition of a data model for the RIP routing protocol.
For the sake of brevity, we do not follow all the guidelines
specified in [RFC6087]. See also Section 4.4.1.
<CODE BEGINS> file "example-rip@2012-02-20.yang"
module example-rip {
namespace "http://example.com/rip";
prefix "rip";
import ietf-routing {
prefix "rt";
}
identity rip {
base rt:routing-protocol;
description
"Identity for the RIP routing protocol.";
}
typedef rip-metric {
type uint8 {
range "0..16";
}
}
grouping route-content {
description
"RIP-specific route content.";
leaf metric {
type rip-metric;
}
leaf tag {
type uint16;
default "0";
description
"This leaf may be used to carry additional info, e.g. AS
number.";
}
}
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augment "/rt:routing/rt:router/rt:routing-tables/rt:routing-table/"
+ "rt:routes/rt:route" {
when "../../../../rt:routing-protocols/"
+ "rt:routing-protocol[rt:name=current()/rt:source-protocol]/"
+ "rt:type='rip:rip'" {
description
"This augment is only valid if the source protocol from which
the route originated is RIP.";
}
description
"RIP-specific route components.";
uses route-content;
}
augment "/rt:get-route/rt:output/rt:route" {
description
"Add RIP-specific route content.";
uses route-content;
}
augment "/rt:routing/rt:router/rt:interfaces/rt:interface" {
when "../../rt:routing-protocols/rt:routing-protocol/rt:type = "
+ "'rip:rip'";
container rip {
description
"Per-interface RIP configuration.";
leaf enabled {
type boolean;
default "true";
}
leaf metric {
type rip-metric;
default "1";
}
}
}
augment "/rt:routing/rt:router/rt:routing-protocols/"
+ "rt:routing-protocol" {
when "rt:type = 'rip:rip'";
container rip {
leaf update-interval {
type uint8 {
range "10..60";
}
units "seconds";
default "30";
description
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"Time interval between periodic updates.";
}
}
}
}
<CODE ENDS>
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Appendix B. Example: Reply to the NETCONF <get> Message
This section contains a sample reply to the NETCONF <get> message,
which could be sent by a server supporting (i.e., advertising them in
the NETCONF <hello> message) the following YANG modules:
o ietf-interfaces [YANG-IF],
o ex-ethernet [YANG-IF],
o ietf-ip [YANG-IP],
o ietf-routing (Section 6),
o ietf-ipv4-unicast-routing (Section 7),
o ietf-ipv6-unicast-routing (Section 8).
We assume a simple network setup as shown in Figure 3: router "A"
uses static default routes with the "ISP" router as the next hop.
IPv6 router advertisements are configured only on the "eth1"
interface and disabled on the upstream "eth0" interface.
+-----------------+
| |
| Router ISP |
| |
+--------+--------+
|2001:db8:0:1::2
|192.0.2.2
|
|
|2001:db8:0:1::1
eth0|192.0.2.1
+--------+--------+
| |
| Router A |
| |
+--------+--------+
eth1|198.51.100.1
|2001:db8:0:2::1
|
Figure 3: Example network configuration
Router "A" then could send the following XML document as its reply to
the NETCONF <get> message:
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<?xml version="1.0"?>
<rpc-reply
message-id="101"
xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
xmlns:v4ur="urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing"
xmlns:v6ur="urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing"
xmlns:if="urn:ietf:params:xml:ns:yang:ietf-interfaces"
xmlns:eth="http://example.com/ethernet"
xmlns:ip="urn:ietf:params:xml:ns:yang:ietf-ip"
xmlns:rt="urn:ietf:params:xml:ns:yang:ietf-routing">
<data>
<if:interfaces>
<if:interface>
<if:name>eth0</if:name>
<if:type>ethernetCsmacd</if:type>
<if:location>05:00.0</if:location>
<ip:ipv4>
<ip:address>
<ip:ip>192.0.2.1</ip:ip>
<ip:prefix-length>24</ip:prefix-length>
</ip:address>
</ip:ipv4>
<ip:ipv6>
<ip:address>
<ip:ip>2001:0db8:0:1::1</ip:ip>
<ip:prefix-length>64</ip:prefix-length>
</ip:address>
<ip:autoconf>
<ip:create-global-addresses>false</ip:create-global-addresses>
</ip:autoconf>
</ip:ipv6>
</if:interface>
<if:interface>
<if:name>eth1</if:name>
<if:type>ethernetCsmacd</if:type>
<if:location>05:00.1</if:location>
<ip:ipv4>
<ip:address>
<ip:ip>198.51.100.1</ip:ip>
<ip:prefix-length>24</ip:prefix-length>
</ip:address>
</ip:ipv4>
<ip:ipv6>
<ip:address>
<ip:ip>2001:0db8:0:2::1</ip:ip>
<ip:prefix-length>64</ip:prefix-length>
</ip:address>
<ip:autoconf>
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<ip:create-global-addresses>false</ip:create-global-addresses>
</ip:autoconf>
</ip:ipv6>
</if:interface>
</if:interfaces>
<rt:routing>
<rt:router>
<rt:name>rtr0</rt:name>
<rt:interfaces>
<rt:interface>
<rt:name>eth0</rt:name>
</rt:interface>
<rt:interface>
<rt:name>eth1</rt:name>
<v6ur:ipv6-router-advertisements>
<v6ur:send-advertisements>true</v6ur:send-advertisements>
<v6ur:prefix-list>
<v6ur:prefix>
<v6ur:seqno>1</v6ur:seqno>
<v6ur:prefix-spec>2001:db8:0:2::/64</v6ur:prefix-spec>
</v6ur:prefix>
</v6ur:prefix-list>
</v6ur:ipv6-router-advertisements>
</rt:interface>
</rt:interfaces>
<rt:routing-protocols>
<rt:routing-protocol>
<rt:name>direct</rt:name>
<rt:type>rt:direct</rt:type>
</rt:routing-protocol>
<rt:routing-protocol>
<rt:name>st0</rt:name>
<rt:description>
Static routing is used for the internal network.
</rt:description>
<rt:type>rt:static</rt:type>
<rt:static-routes>
<v4ur:ipv4>
<v4ur:route>
<v4ur:seqno>1</v4ur:seqno>
<v4ur:dest-prefix>0.0.0.0/0</v4ur:dest-prefix>
<v4ur:next-hop>192.0.2.2</v4ur:next-hop>
</v4ur:route>
</v4ur:ipv4>
<v6ur:ipv6>
<v6ur:route>
<v6ur:seqno>1</v6ur:seqno>
<v6ur:dest-prefix>::/0</v6ur:dest-prefix>
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<v6ur:next-hop>2001:db8:0:1::2</v6ur:next-hop>
</v6ur:route>
</v6ur:ipv6>
</rt:static-routes>
<rt:connected-routing-tables>
<rt:routing-table>
<rt:name>ipv4-unicast-main</rt:name>
</rt:routing-table>
<rt:routing-table>
<rt:name>ipv6-unicast-main</rt:name>
</rt:routing-table>
</rt:connected-routing-tables>
</rt:routing-protocol>
</rt:routing-protocols>
<rt:routing-tables>
<rt:routing-table>
<rt:name>ipv4-unicast-fib</rt:name>
<rt:routes>
<rt:route>
<v4ur:dest-prefix>192.0.2.1/24</v4ur:dest-prefix>
<v4ur:outgoing-interface>eth0</v4ur:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:last-modified>2012-02-20T17:11:27+01:00</rt:last-modified>
</rt:route>
<rt:route>
<v4ur:dest-prefix>198.51.100.0/24</v4ur:dest-prefix>
<v4ur:outgoing-interface>eth1</v4ur:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:last-modified>2012-02-20T17:11:27+01:00</rt:last-modified>
</rt:route>
<rt:route>
<v4ur:dest-prefix>0.0.0.0/0</v4ur:dest-prefix>
<v4ur:next-hop>192.0.2.2</v4ur:next-hop>
<rt:source-protocol>st0</rt:source-protocol>
<rt:last-modified>2012-02-20T18:02:45+01:00</rt:last-modified>
</rt:route>
</rt:routes>
</rt:routing-table>
<rt:routing-table>
<rt:name>ipv6-unicast-fib</rt:name>
<rt:address-family>ipV6</rt:address-family>
<rt:safi>nlri-unicast</rt:safi>
<rt:routes>
<rt:route>
<v6ur:dest-prefix>2001:db8:0:1::/64</v6ur:dest-prefix>
<v6ur:outgoing-interface>eth0</v6ur:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:last-modified>2012-02-20T17:11:27+01:00</rt:last-modified>
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</rt:route>
<rt:route>
<v6ur:dest-prefix>2001:db8:0:2::/64</v6ur:dest-prefix>
<v6ur:outgoing-interface>eth1</v6ur:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:last-modified>2012-02-20T17:11:27+01:00</rt:last-modified>
</rt:route>
<rt:route>
<v6ur:dest-prefix>::/0</v6ur:dest-prefix>
<v6ur:next-hop>2001:db8:0:1::2</v6ur:next-hop>
<rt:source-protocol>st0</rt:source-protocol>
<rt:last-modified>2012-02-20T18:02:45+01:00</rt:last-modified>
</rt:route>
</rt:routes>
</rt:routing-table>
<rt:routing-table>
<rt:name>ipv4-unicast-main</rt:name>
<rt:recipient-routing-tables>
<rt:recipient-name>ipv4-unicast-fib</rt:recipient-name>
</rt:recipient-routing-tables>
<rt:routes>
<rt:route>
<v4ur:dest-prefix>0.0.0.0/0</v4ur:dest-prefix>
<rt:source-protocol>st0</rt:source-protocol>
<v4ur:next-hop>192.0.2.2</v4ur:next-hop>
<rt:last-modified>2012-02-20T18:02:45+01:00</rt:last-modified>
</rt:route>
</rt:routes>
</rt:routing-table>
<rt:routing-table>
<rt:name>ipv6-unicast-main</rt:name>
<rt:address-family>ipV6</rt:address-family>
<rt:safi>nlri-unicast</rt:safi>
<rt:recipient-routing-tables>
<rt:recipient-name>ipv6-unicast-fib</rt:recipient-name>
</rt:recipient-routing-tables>
<rt:routes>
<rt:route>
<v6ur:dest-prefix>::/0</v6ur:dest-prefix>
<v6ur:next-hop>2001:db8:0:1::2</v6ur:next-hop>
<rt:source-protocol>st0</rt:source-protocol>
<rt:last-modified>2012-02-20T18:02:45+01:00</rt:last-modified>
</rt:route>
</rt:routes>
</rt:routing-table>
</rt:routing-tables>
</rt:router>
</rt:routing>
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</data>
</rpc-reply>
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Appendix C. Change Log
RFC Editor: remove this section upon publication as an RFC.
C.1. Changes Between Versions -01 and -02
o Added module "ietf-ipv6-unicast-routing".
o The example in Appendix B now uses IP addresses from blocks
reserved for documentation.
o Direct routes appear by default in the FIB table.
o Logical interfaces must be assigned to a router instance.
Additional interface configuration may be present.
o The "when" statement is only used with "augment", "must" is used
elsewhere.
o Additional "must" statements were added.
o The "route-content" grouping for IPv4 and IPv6 unicast now
includes the material from the "ietf-routing" version via "uses
rt:route-content".
o Explanation of symbols in the tree representation of data model
hierarchy.
C.2. Changes Between Versions -00 and -01
o AFN/SAFI-independent stuff was moved to the "ietf-routing" module.
o Typedefs for AFN and SAFI were placed in a separate "iana-afn-
safi" module.
o Names of some data nodes were changed, in particular "routing-
process" is now "router".
o The restriction of a single AFN/SAFI per router was lifted.
o RPC operation "delete-route" was removed.
o Illegal XPath references from "get-route" to the datastore were
fixed.
o Section "Security Considerations" was written.
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Author's Address
Ladislav Lhotka
CZ.NIC
Email: lhotka@nic.cz
Lhotka Expires August 23, 2012 [Page 64]
