One document matched: draft-ietf-netmod-routing-cfg-03.xml
<?xml version="1.0"?>
<!DOCTYPE rfc SYSTEM "rfc2629.dtd" [
<!ENTITY routing SYSTEM "ietf-routing.yangx">
<!ENTITY ipv4-unicast SYSTEM "ietf-ipv4-unicast-routing.yangx">
<!ENTITY ipv6-unicast SYSTEM "ietf-ipv6-unicast-routing.yangx">
<!ENTITY rip SYSTEM "example-rip.yangx">
<!ENTITY get-reply SYSTEM "sample-get-reply.xml.aw">
<!ENTITY yang-tree SYSTEM "yang-tree.txt.aw">
<!ENTITY diagram SYSTEM "diagram.txt.aw">
<!ENTITY example-net SYSTEM "example-net.txt.aw">
]>
<?rfc toc="yes"?>
<?rfc symrefs="yes"?>
<?rfc sortrefs="yes"?>
<rfc ipr="trust200902" category="std" docName="draft-ietf-netmod-routing-cfg-03">
<front>
<title abbrev="YANG Routing Configuration">A YANG Data Model for
Routing Configuration</title>
<author initials="L." surname="Lhotka" fullname="Ladislav Lhotka">
<organization>CZ.NIC</organization>
<address>
<email>lhotka@nic.cz</email>
</address>
</author>
<date day="25" month="May" year="2012"/>
<area>Operations and Management</area>
<workgroup>NETMOD</workgroup>
<abstract>
<t>This document contains a specification of three YANG modules.
Together they form the core routing data model which serves as a
framework 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.</t>
</abstract>
</front>
<middle>
<section anchor="sec.introduction" title="Introduction">
<t>This document contains a specification of the following YANG
modules:
<list style="symbols">
<t>Module "ietf-routing" provides generic components of a
routing data model.</t>
<t>Module "ietf-ipv4-unicast-routing" augments the
"ietf-routing" module with additional data specific to IPv4
unicast.</t>
<t>Module "ietf-ipv6-unicast-routing" augments the
"ietf-routing" module with additional data specific to IPv6
unicast, including the router configuration variables required
by <xref target="RFC4861"/>.</t>
</list></t>
<t>These modules together define the so-called core routing data
model, which is proposed 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.</t>
</section>
<section anchor="sec.term-not" title="Terminology and Notation">
<t>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 <xref target="RFC2119"/>.</t>
<t>The following terms are defined in <xref target="RFC6241"/>:
<list style="symbols">
<t>client</t>
<t>message</t>
<t>protocol operation</t>
<t>server</t>
</list></t>
<t>The following terms are defined in <xref target="RFC6020"/>:
<list style="symbols">
<t>augment</t>
<t>configuration data</t>
<t>container</t>
<t>data model</t>
<t>data node</t>
<t>data type</t>
<t>identity</t>
<t>mandatory node</t>
<t>module</t>
<t>operational state data</t>
<t>prefix</t>
<t>RPC operation</t>
</list></t>
<section anchor="sec.new-terms" title="Glossary of New Terms">
<t><list style="hanging">
<t hangText="active route:">a route which is actually used for
sending packets. If there are multiple candidate routes with a
matching destination prefix, then it is up to the routing
algorithm to select the active route (or several active routes
in the case of multi-path routing).</t>
<t hangText="core routing data model:"> YANG data model
resulting from the combination of "ietf-routing",
"ietf-ipv4-unicast-routing" and
"ietf-ipv6-unicast-routing" modules.</t>
<t hangText="direct route:">a route to a directly connected
network.</t>
</list></t>
</section>
<section anchor="sec.prefixes" title="Prefixes in Data Node Names">
<t>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 using
the standard prefix associated with the corresponding YANG
module, as shown in <xref target="tab.prefixes"/>.</t>
<texttable anchor="tab.prefixes" title="Prefixes and corresponding YANG modules">
<ttcol>Prefix</ttcol>
<ttcol>YANG module</ttcol>
<ttcol>Reference</ttcol>
<c>ianaaf</c><c>iana-afn-safi</c><c><xref target="IANA-IF-AF"/></c>
<c>if</c><c>ietf-interfaces</c><c><xref target="YANG-IF"/></c>
<c>ip</c><c>ietf-ip</c><c><xref target="YANG-IP"/></c>
<c>rip</c><c>example-rip</c><c><xref target="app.rip"/></c>
<c>rt</c><c>ietf-routing</c><c><xref target="sec.mod-rt"/></c>
<c>v4ur</c><c>ietf-ipv4-unicast-routing</c>
<c><xref target="sec.mod-v4ur"/></c>
<c>v6ur</c><c>ietf-ipv6-unicast-routing</c>
<c><xref target="sec.mod-v6ur"/></c>
<c>yang</c><c>ietf-yang-types</c><c><xref target="RFC6021"/></c>
<c>inet</c><c>ietf-inet-types</c><c><xref target="RFC6021"/></c>
</texttable>
</section>
</section>
<section anchor="sec.objectives" title="Objectives">
<t>The initial design of the core routing data model was driven by
the following objectives:
<list style="symbols">
<t>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).</t>
<t>Simple routing setups, such as static routing, should be
configurable in a simple way, ideally without any need to develop
additional YANG modules.</t>
<t>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.</t>
<t>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.</t>
</list>
</t>
</section>
<section anchor="sec.design" title="The Design of the Core Routing Data Model">
<t>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 <xref target="fig.yangdata"/>, where brackets enclose
list keys, "rw" means configuration, "ro" operational state data,
and "?" means optional node. Parentheses enclose choice and case
nodes, and case nodes are also marked with a colon (":").</t>
<figure anchor="fig.yangdata" title="Data hierarchy of the core routing data model.">
<artwork><![CDATA[
+--rw routing
+--rw router [name]
| +--rw name
| +--rw router-id?
| +--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 [prefix-spec]
| | +--rw v6ur:prefix-spec
| | +--rw (control-adv-prefixes)?
| | +--:(no-advertise)
| | | +--rw v6ur:no-advertise?
| | +--:(advertise)
| | +--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?
| | | +--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 routing-tables
| +--rw routing-table [name]
| +--rw name
| +--rw address-family?
| +--rw safi?
| +--rw description?
| +--ro routes
| | +--ro route
| | +--ro source-protocol
| | +--ro age
| | +--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
| +--rw recipient-routing-table [name]
| +--rw name
| +--rw filter?
+--rw route-filters
+--rw route-filter [name]
+--rw name
+--rw description?
+--rw type?
]]></artwork>
</figure>
<t>As can be seen from <xref target="fig.yangdata"/>, the core
routing data model introduces several generic components of a
routing framework: routers, routing tables containing routes,
routing protocols and route filters. The following subsections
describe these components in more detail.</t>
<t>By combining the components in various ways, and possibly
augmenting them with appropriate contents defined in other
modules, various routing setups can be realized.</t>
<figure anchor="fig.exsetup" title="Example setup of the routing subsystem">
<artwork><![CDATA[
+--------+
| direct | +---+ +--------------+ +---+ +--------------+
| routes |--->| F |--->| |<---| F |<---| |
+--------+ +---+ | main | +---+ | additional |
| routing | | routing |
+--------+ +---+ | table | +---+ | table |
| static |--->| F |--->| |--->| F |--->| |
| routes | +---+ +--------------+ +---+ +--------------+
+--------+ ^ | ^ |
| v | v
+---+ +---+ +---+ +---+
| F | | F | | F | | F |
+---+ +---+ +---+ +---+
^ | ^ |
| v | v
+----------+ +----------+
| routing | | routing |
| protocol | | protocol |
+----------+ +----------+
]]></artwork>
</figure>
<t>The example in <xref target="fig.exsetup"/> shows a typical
(though certainly not the only possible) organization of a more
complex routing subsystem for a single address family. Several of
its features are worth mentioning:
<list style="symbols">
<t>Along with the main routing table, which must always be
present, an additional routing table is configured.</t>
<t>Each routing protocol instance, including the "static" and
"direct" pseudo-protocols, is connected to one routing
table with which it can exchange routes (in both directions,
except for the "static" and "direct" pseudo-protocols).</t>
<t>Routing tables may also be connected to each other and
exchange routes in either direction (or both).</t>
<t>Route exchanges along all connections may be controlled by
means of route filters, denoted by "F" in <xref target="fig.exsetup"/>.</t>
</list></t>
<section anchor="sec.router" title="Router">
<t>Each router instance in the core routing data model
represents a logical router. The exact semantics of this term is left
to implementations. For example, router instances may be
completely isolated virtual routers or, alternatively, they may
internally share certain information.</t>
<t>Network layer 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
("rt:interface"). The key of the list entry MUST be the name of
a configured network layer interface, i.e., the value of a node
/if:interfaces/if:interface/if:name defined in the
"ietf-interfaces" module.<xref target="YANG-IF"/>.</t>
<t>Implementations MAY specify additional rules for the
assignment of interfaces to logical routers. For example, it may
be required that the sets of interfaces assigned to different
logical routers be disjoint.</t>
<t>Apart from the key, each entry of the "rt:interface" list MAY
contain other configuration or operational state data related to
the corresponding router interface.</t>
<section anchor="sec.4861" title="Configuration of IPv6 Router Interfaces">
<t>The module "ietf-ipv6-unicast-routing" augments the
definition of the data node "rt:interface"
with definitions of the following configuration variables as
required by <xref target="RFC4861"/>, sec. 6.2.1:
<list style="symbols">
<t>send-advertisements,</t>
<t>max-rtr-adv-interval,</t>
<t>min-rtr-adv-interval,</t>
<t>managed-flag,</t>
<t>other-config-flag,</t>
<t>link-mtu,</t>
<t>reachable-time,</t>
<t>retrans-timer,</t>
<t>cur-hop-limit,</t>
<t>default-lifetime,</t>
<t>prefix-list: a list of prefixes to be advertised. The
following parameters are associated with each prefix in the
list:
<list style="symbols">
<t>valid-lifetime,</t>
<t>on-link-flag,</t>
<t>preferred-lifetime,</t>
<t>autonomous-flag.</t>
</list></t>
</list>
The definitions and descriptions of the above parameters can be
found in the text of the module "ietf-ipv6-unicast-routing"
(<xref target="sec.mod-v6ur"/>).</t>
<t>NOTE: The "IsRouter" flag, which is also required by <xref target="RFC4861"/>, is implemented by the "ietf-ip" module
<xref target="YANG-IP"/> (leaf "ip:ip-forwarding").</t>
</section>
</section>
<section anchor="sec.route" title="Route">
<t>Routes are basic units of information in a routing
system. The core routing data model defines only the following
minimal set of route attributes:
<list style="symbols">
<t>"destination-prefix": IP prefix specifying the set of
destination addresses for which the route may be used. This
attribute is mandatory.</t>
<t>"next-hop": IP address of the adjacent router or host to
which packets with destination addresses belonging to
destination-prefix should be sent.</t>
<t>"outgoing-interface": network interface that should be
used for sending packets with destination addresses belonging
to destination-prefix.</t>
</list>
</t>
<t>The above list of route attributes should suffice 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.</t>
<t>Routes and their attributes are used both in configuration
data, for example as manually configured static routes, and in
operational state data, for example as entries in routing
tables.</t>
</section>
<section anchor="sec.rtables" title="Routing Tables">
<t>Routing tables are lists of routes complemented with
administrative data, namely:
<list style="symbols">
<t>"source-protocol": name of the routing protocol from which
the route was originally obtained.</t>
<t>"age": number of seconds since the route was created or
last updated.</t>
</list>
Each routing table may only contain routes of the same address
family. Address family information consists of two parameters -
"address-family" and "safi" (Subsequent Address Family
Identifier, SAFI). The permitted values for these two parameters
are defined by IANA and translated into YANG enumeration types
"ianaaf:address-family" and "ianaaf:subsequent-address-family"
<xref target="IANA-IF-AF"/>.</t>
<t>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 route lists
are controlled and manipulated by routing protocol operations
which may result in route additions, removals and
modifications. This also includes manipulations via the "static"
and/or "direct" pseudo-protocols, see <xref target="sec.pseudoproto"/>.</t>
<t>One routing table MUST be present for each router instance
and each address family supported by that router instance. It is
the so-called main routing table to which all routing protocol
instances supporting the given address family SHOULD be
connected by default. For the two address families that are part
of the core routing data model, the names of the main routing
tables SHOULD be as follows:
<list style="symbols">
<t>"main-ipv4-unicast" for IPv4 unicast,</t>
<t>"main-ipv6-unicast" for IPv6 unicast.</t>
</list></t>
<t>Additional routing tables MAY be configured by creating new
entries in the "routing-table" list, either as a part of
factory-default configuration, or by a client's action.</t>
<t>The naming scheme for additional routing tables, as well as
restrictions on the number and configurability of routing tables
are implementation-specific.</t>
<t>The way how the routing system uses information from routing
tables is outside the scope of this document. Typically,
implementations will either use a forwarding table, or perform a
direct look-up in the main routing table in conjunction with a
route cache.</t>
<t>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.</t>
</section>
<section anchor="sec.proto" title="Routing Protocols">
<t>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 (<xref target="sec.pseudoproto"/>).</t>
<t>Each routing protocol instance is connected to exactly one
routing table for each address family that the routing protocol
instance supports. By default, every routing protocol instance
SHOULD be connected to the main routing table or tables. An
implementation MAY allow any or all routing protocol instances
to be configured to use a different routing table.</t>
<t>Routes learned from the network by a routing protocol are
passed to the connected routing table(s) 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 may be advertised by that protocol to the
network.</t>
<t>Two independent route filters (see <xref target="sec.filters"/>) 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:
<list style="symbols">
<t>import filter controls which routes are passed from a
routing protocol instance to the routing table,</t>
<t>export filter controls which routes the routing protocol
instance may receive from the connected routing table.</t>
</list></t>
<t>Note that, for historical reasons, the terms import and
export are used from the viewpoint of a routing table.</t>
<section anchor="sec.pseudoproto" title="Routing Pseudo-Protocols">
<t>The core routing data model defines two special routing
protocol types - "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.</t>
<t>Every router instance MUST contain exactly one instance of
the "direct" pseudo-protocol type. The name of this instance
MUST also be "direct". It is the source of direct routes for all
configured address families. Direct routes are normally supplied
by the operating system kernel, based on the configuration of
network interface addresses, see <xref target="sec.ietf-ip"/>. Direct routes SHOULD by default appear
in the main routing table for each configured address
family. 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.</t>
<t>A pseudo-protocol of the type "static" allows for specifying
routes manually. It MAY be configured in zero or multiple
instances, although a typical implementation will have exactly
one instance per logical router.</t>
</section>
<section anchor="sec.newproto" title="Defining New Routing Protocols">
<t>It is expected that future YANG modules will create data
models for additional routing protocol types. Such a new
module has to define the protocol-specific configuration and
operational state data, and fit it into the core routing
framework in the following way :
<list style="symbols">
<t>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".</t>
<t>Additional route attributes MAY be defined, preferably in
one place by means of defining a YANG grouping. The new
attributes 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.</t>
<t>Per-interface configuration parameters can be added by
augmenting the data node "rt:interface" (the list of router
interfaces).</t>
<t>Other configuration parameters and operational state data
can be defined by augmenting the "routing-protocol" data
node. By using the "when" statement, this augment SHOULD be
made conditional and valid only if the value of the
"rt:type" child leaf equals to the new protocol's
identity.</t>
</list></t>
<t>It is RECOMMENDED that both per-interface and other
configuration data specific to the new protocol be
encapsulated in an appropriately named container.</t>
<t>The above steps are implemented by the example YANG module
for the RIP routing protocol in <xref target="app.rip"/>. First, the module defines a new
identity for the RIP protocol:</t>
<figure>
<artwork><![CDATA[
identity rip {
base rt:routing-protocol;
description "Identity for the RIP routing protocol.";
}]]></artwork>
</figure>
<t>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 "active-route" RPC method:</t>
<figure>
<artwork><![CDATA[
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:active-route/rt:output/rt:route" {
description
"Add RIP-specific route content.";
uses route-content;
}]]></artwork>
</figure>
<t>Per-interface configuration data are defined by the
following "augment" statement:</t>
<figure>
<artwork><![CDATA[
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";
}
}
}]]></artwork>
</figure>
<t>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":</t>
<figure>
<artwork><![CDATA[
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.";
}
}
}]]></artwork>
</figure>
</section>
</section>
<section anchor="sec.filters" title="Route Filters">
<t>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 attributes.</t>
<t>Route filters are global, which means that a configured route
filter may be used by any or all router instances.</t>
<t>By itself, the route filtering framework defined in this
document allows for applying only the extreme routing policies
which are represented by the following pre-defined route filter
types:
<list style="symbols">
<t>"deny-all-route-filter": all routes are blocked,</t>
<t>"allow-all-route-filter": all routes are permitted.</t>
</list>
It is expected that real route filtering frameworks will be
developed separately.</t>
<t>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 the route filter type is the identity
"deny-all-route-filter".</t>
</section>
<section anchor="sec.rpcs" title="RPC Operations">
<t>The "ietf-routing" module defines two RPC
operations:
<list style="symbols">
<t>active-route,</t>
<t>route-count.</t>
</list>
Their parameters and semantics are described in the following
subsections.</t>
<section anchor="sec.active-route" title="Operation "active-route"">
<t>
<list style="hanging">
<t hangText="Description:">Retrieve one or more active
routes from the forwarding information base (FIB) of a
router instance, i.e., the route(s) that are currently
used by that router instance for sending datagrams to the
destination whose address is provided as an input
parameter.</t>
<t hangText="Parameters:">
<list style="hanging">
<t hangText="router-name:">Name of the router instance
whose FIB is to be queried.</t>
<t hangText="destination-address:">Network layer
destination address for which the active routes are
requested.</t>
</list>
</t>
<t hangText="Positive Response:">One or more "route"
elements containing the active route(s).</t>
<t hangText="Negative Response:">
<vspace blankLines="1"/>
If the logical router is not found, the server sends an
"rpc-error" message with "error-tag" set to
"missing-element", and "error-app-tag" set to
"router-not-found".
<vspace blankLines="1"/>
If no route exists for the given destination address,
the server sends an "rpc-error" message with "error-tag"
set to "data-missing" and "error-app-tag" set to
"no-route".
</t>
</list>
</t>
</section>
<section anchor="sec.route-count" title="Operation "route-count"">
<t>
<list style="hanging">
<t hangText="Description:">Retrieve the total number of
routes in a routing table.</t>
<t hangText="Parameters:">
<list style="hanging">
<t hangText="router-name:">Name of the logical router containing
the routing table.</t>
<t hangText="routing-table:">Name of the routing table.</t>
</list>
</t>
<t hangText="Positive Response:">Element
"number-of-routes" containing the requested nonnegative
number.</t>
<t hangText="Negative Response:">If the logical router or
the routing table is not found, the server sends an
"rpc-error" message with "error-tag" set to
"missing-element", and "error-app-tag" set to
"router-not-found" or "routing-table-not-found",
respectively.</t>
</list>
</t>
</section>
</section>
</section>
<section anchor="sec.interactions" title="Interactions with Other YANG Modules">
<t>The semantics of the core routing data model also depends on
several configuration parameters that are defined in other YANG
modules. The following subsections describe these
interactions.</t>
<section anchor="sec.ietf-if" title="Module "ietf-interfaces"">
<t>The following boolean switch is defined in the
"ietf-interfaces" YANG module <xref target="YANG-IF"/>:
<list style="hanging">
<t hangText="/if:interfaces/if:interface/if:enabled">
<vspace blankLines="1"/>
If this switch is set to "false" for a given network layer
interface, the device MUST behave exactly as if that
interface was not assigned to any logical router at all.
</t>
</list>
</t>
</section>
<section anchor="sec.ietf-ip" title="Module "ietf-ip"">
<t>The following boolean switches are defined in the "ietf-ip"
YANG module <xref target="YANG-IP"/>:
<list style="hanging">
<t hangText="/if:interfaces/if:interface/ip:ipv4/ip:enabled">
<vspace blankLines="1"/>
If this switch is set to "false" for a given interface, then
all IPv4 routing functions related to that interface MUST be
disabled.
</t>
<t hangText="/if:interfaces/if:interface/ip:ipv4/ip:ip-forwarding">
<vspace blankLines="1"/>
If this switch is set to "false" for a given interface, then
the forwarding of IPv4 datagrams to and from this interface
MUST be disabled. However, the interface may participate in
other routing functions, such as routing protocols.
</t>
<t hangText="/if:interfaces/if:interface/ip:ipv6/ip:enabled">
<vspace blankLines="1"/>
If this switch is set to "false" for a given interface, then
all IPv6 routing functions related to that interface MUST be
disabled.
</t>
<t hangText="/if:interfaces/if:interface/ip:ipv6/ip:ip-forwarding">
<vspace blankLines="1"/>
If this switch is set to "false" for a given interface, then
the forwarding of IPv6 datagrams to and from this interface
MUST be disabled. However, the interface may participate in
other routing functions, such as routing protocols.
</t>
</list>
</t>
<t>In addition, the "ietf-ip" module allows for configuring IPv4
and IPv6 addresses and subnet masks. Configuration of these
parameters on an enabled interface MUST result in an immediate
creation of the corresponding direct route (usually in the main
routing table). Its destination prefix is set according to the
configured IP address and subnet mask, and the interface is set
as the outgoing interface for that route.</t>
</section>
</section>
<section anchor="sec.mod-rt" title="Routing YANG Module">
<t>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).</t>
<figure>
<artwork>
<![CDATA[<CODE BEGINS> file "ietf-routing@2012-05-24.yang"
module ietf-routing {
namespace "urn:ietf:params:xml:ns:yang:ietf-routing";
prefix "rt";
import ietf-inet-types {
prefix "inet";
}
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 YANG module defines essential components that may be used
for configuring a routing subsystem.
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 2012-05-24 {
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;
description
"Route filter that blocks all routes.";
}
identity allow-all-route-filter {
base route-filter;
description
"Route filter that permits all routes.
Note that use of this filter is equivalent to no filter at
all.
";
}
/* 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.";
}
}
/* RPC Methods */
rpc active-route {
description
"Return the active route (or multiple routes, in the case of
multi-path routing) to a destination address.
Parameters
1. 'router-name',
2. 'destination-address'.
If the logical router with 'router-name' doesn't exist, then
this operation will fail with error-tag 'missing-element' and
error-app-tag 'router-not-found'.
If there is no active route for 'destination-address', then
this operation will fail with error-tag 'data-missing' and
error-app-tag 'no-route'.
";
input {
leaf router-name {
type router-ref;
mandatory "true";
description
"Name of the router instance whose forwarding information
base is being queried.";
}
container destination-address {
uses afn-safi;
description
"Network layer destination address.
AFN/SAFI-specific modules must augment this container with
a leaf named 'address'.
";
}
}
output {
list route {
min-elements "1";
uses afn-safi;
uses route-content;
description
"Route contents specific for each address family should be
defined through augmenting.";
}
}
}
rpc route-count {
description
"Return the current number of routes in a routing table.
Parameters:
1. 'router-name',
2. 'routing-table-name'.
If the logical router with 'router-name' doesn't exist, then
this operation will fail with error-tag 'missing-element' and
error-app-tag 'router-not-found'.
If the routing table with 'routing-table-name' doesn't exist,
then this operation will fail with error-tag 'missing-element'
and error-app-tag 'routing-table-not-found'.
";
input {
leaf router-name {
type router-ref;
mandatory "true";
description
"Name of the router instance containing the routing
table.";
}
leaf routing-table {
type leafref {
path "/routing/router/routing-tables/routing-table/name";
}
mandatory "true";
description
"Name of the routing table.";
}
}
output {
leaf number-of-routes {
type uint32;
mandatory "true";
description
"Number of routes in the routing table.";
}
}
}
/* Data Nodes */
container routing {
description
"Routing parameters.";
list router {
key "name";
unique "router-id";
description
'Each list entry is a container for configuration and
operational state data of a single (logical) router.
Network layer interfaces assigned to the router must have
their entries in the "interfaces" list.
';
leaf name {
type string;
description
"The unique router name.";
}
leaf router-id {
type inet:ipv4-address;
description
"Global router ID in the form of an IPv4 address.
An implementation may select a value if this parameter is
not configured.
Routing protocols may override this global parameter
inside their configuration.
";
}
leaf description {
type string;
description
"Textual description of the router.";
}
leaf enabled {
type boolean;
default "true";
description
"Enable the router. The default value is 'true'.
If this parameter is false, the parent router instance is
disabled, despite any other configuration that might be
present.
";
}
container interfaces {
description
"Router interface parameters.";
list interface {
key "name";
description
"List of network layer interfaces assigned to the router
instance.";
leaf name {
type if:interface-ref;
description
"A reference to the name of a configured network layer
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;
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[rt:name=current()/"
+ "preceding-sibling::routing-table/name]/"
+ "address-family=../../../../routing-tables/"
+ "routing-table[rt:name=current()/name]/"
+ "address-family and ../../../../routing-tables/"
+ "routing-table[rt:name=current()/"
+ "preceding-sibling::routing-table/name]/safi=../"
+ "../../../routing-tables/"
+ "routing-table[rt:name=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.
If no connected routing table is defined for an
address family, the routing protocol should be
connected by default to the main routing table for
that address family.
";
leaf name {
type leafref {
path "../../../../../routing-tables/routing-table/"
+ "name";
}
description
"Reference to an existing routing table.";
}
leaf import-filter {
type leafref {
path "/routing/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 "/routing/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='rt:static'" {
error-message "Static routes may be configured only "
+ "for 'static' routing protocol.";
description
"This container is only valid for the 'static'
routing protocol.";
}
description
"Configuration of 'static' pseudo-protocol.";
}
}
}
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.";
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.";
uses route-content;
leaf source-protocol {
type leafref {
path "/routing/router/routing-protocols/"
+ "routing-protocol/name";
}
mandatory "true";
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 age {
type uint32;
units "seconds";
mandatory "true";
description
"The number of seconds since the parent route was
created or last updated.";
}
}
}
container recipient-routing-tables {
description
"Container for recipient routing tables.";
list recipient-routing-table {
key "name";
description
"A list of routing tables that receive routes from
this routing table.";
leaf name {
type leafref {
path "/routing/router/routing-tables/"
+ "routing-table/name";
}
description
"The name of the recipient routing table.";
}
leaf filter {
type leafref {
path "/routing/route-filters/route-filter/name";
}
description
"A route filter which is applied to the routes
passed on to the recipient routing table.";
}
}
}
}
}
}
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 "rt: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.";
}
}
}
}
}
<CODE ENDS>]]></artwork>
</figure>
</section>
<section anchor="sec.mod-v4ur" title="IPv4 Unicast Routing YANG Module">
<t>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).</t>
<figure>
<artwork>
<![CDATA[<CODE BEGINS> file "ietf-ipv4-unicast-routing@2012-05-25.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 YANG module augments the 'ietf-routing' module with basic
configuration and operational state data for IPv4 unicast
routing.
Every implementation must preconfigure a routing table with the
name 'main-ipv4-unicast', which is the main routing table for
IPv4 unicast.
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 2012-05-24 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
/* Groupings */
grouping route-content {
description
"Parameters of IPv4 unicast routes.";
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:active-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:active-route' operation.";
leaf address {
type inet:ipv4-address;
description
"IPv4 destination address.";
}
}
augment "/rt:active-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:active-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 uint32 {
range "1..max";
}
description
"Sequential number of the route.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
uses rt:route-content;
uses route-content {
refine "dest-prefix" {
mandatory "true";
}
}
}
}
}
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'" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"This augment defines the content of IPv4 unicast routes.";
uses route-content;
}
}
<CODE ENDS>]]></artwork>
</figure>
</section>
<section anchor="sec.mod-v6ur" title="IPv6 Unicast Routing YANG Module">
<t>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).</t>
<figure>
<artwork>
<![CDATA[<CODE BEGINS> file "ietf-ipv6-unicast-routing@2012-05-24.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
"This YANG module augments the 'ietf-routing' module with basic
configuration and operational state data for IPv6 unicast
routing.
Every implementation must preconfigure a routing table with the
name 'main-ipv6-unicast', which is the main routing table for
IPv6 unicast.
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 2012-05-24 {
description
"Initial revision.";
reference
"RFC XXXX: A YANG Data Model for Routing Configuration";
}
/* Groupings */
grouping route-content {
description
"Specific parameters of IPv6 unicast routes.";
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:active-route/rt:input/rt:destination-address" {
when "address-family='ipv6' and safi='nlri-unicast'" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"The 'address' leaf augments the 'rt:destination-address'
parameter of the 'rt:active-route' operation.";
leaf address {
type inet:ipv6-address;
description
"IPv6 destination address.";
}
}
augment "/rt:active-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:active-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
"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 0.75 * 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 {
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";
}
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 max-rtr-adv-interval 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.
By 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 "prefix-spec";
description
"Advertised prefix entry.";
leaf prefix-spec {
type inet:ipv6-prefix;
description
"IPv6 address prefix.";
}
choice control-adv-prefixes {
default "advertise";
description
"The prefix either may be explicitly removed from the
set of advertised prefixes, or parameters with which
it is advertised may be specified (default case).";
leaf no-advertise {
type empty;
description
"The prefix will not be advertised.
This may be used for removing the prefix from the
default set of advertised prefixes.
";
}
case advertise {
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.
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 preferred-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 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.";
}
}
}
}
}
}
}
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 uint32 {
range "1..max";
}
description
"Sequential number of the route.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
uses rt:route-content;
uses route-content {
refine "dest-prefix" {
mandatory "true";
}
}
}
}
}
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>]]></artwork>
</figure>
</section>
<section anchor="sec.iana" title="IANA Considerations">
<t>RFC Ed.: In this section, replace all occurrences of 'XXXX' with
the actual RFC number (and remove this note).</t>
<t>This document registers the following namespace URIs in the
IETF XML registry <xref target="RFC3688"/>:</t>
<figure>
<artwork>
----------------------------------------------------------
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.
----------------------------------------------------------
</artwork>
</figure>
<t>This document registers the following YANG modules in the YANG
Module Names registry <xref target="RFC6020"/>:</t>
<figure>
<artwork>
-------------------------------------------------------------------
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
-------------------------------------------------------------------
</artwork>
</figure>
</section>
<section anchor="sec-cons" title="Security Considerations">
<t>The YANG modules defined in this document are designed to be
accessed via the NETCONF protocol <xref target="RFC6241"/>. The
lowest NETCONF layer is the secure transport layer and the
mandatory-to-implement secure transport is SSH <xref target="RFC6242"/>.</t>
<t>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 protocol operations are not
properly protected.</t>
<t>The vulnerable "config true" subtrees and data nodes are the
following:
<list style="hanging">
<t hangText="/rt:routing/rt:router/rt:interfaces/rt:interface">This
list assigns a network layer interface to a router instance and
may also specify interface parameters related to routing.</t>
<t hangText="/rt:routing/rt:router/rt:routing-protocols/rt:routing-protocol">This
list specifies the routing protocols configured on a device.</t>
<t hangText="/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.</t>
</list>
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.</t>
</section>
<section anchor="acknowledgments" title="Acknowledgments">
<t>The author wishes to thank Martin Bjorklund, Joel Halpern,
Thomas Morin, Tom Petch, Juergen Schoenwaelder, Dave Thaler and Yi
Yang for their helpful comments and suggestions.</t>
</section>
</middle>
<back>
<references title="Normative References">
<reference anchor="IANA-IF-AF">
<front>
<title>IANA Interface Type and Address Family YANG Modules</title>
<author initials="M." surname="Bjorklund" fullname="M. Bjorklund">
<organization/>
</author>
<date month="April" day="29" year="2012"/>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-netmod-iana-if-type-02"/>
<format type="HTML" target="http://tools.ietf.org/html/draft-ietf-netmod-iana-if-type-02"/>
</reference>
<reference anchor="RFC2119">
<front>
<title abbrev="RFC Key Words">Key words for use in RFCs to
Indicate Requirement Levels</title>
<author initials="S." surname="Bradner" fullname="S. Bradner">
<organization/>
</author>
<date year="1997" month="March"/>
</front>
<seriesInfo name="BCP" value="14"/>
<seriesInfo name="RFC" value="2119"/>
<format type="TXT" octets="4723" target="ftp://ftp.isi.edu/in-notes/rfc2119.txt"/>
</reference>
<reference anchor="RFC3688">
<front>
<title>The IETF XML Registry</title>
<author initials="M." surname="Mealling" fullname="M. Mealling">
<organization/></author>
<date year="2004" month="January"/>
</front>
<seriesInfo name="BCP" value="81"/>
<seriesInfo name="RFC" value="3688"/>
<format type="TXT" octets="17325" target="ftp://ftp.isi.edu/in-notes/rfc3688.txt"/>
</reference>
<reference anchor="RFC4861">
<front>
<title>Neighbor Discovery for IP version 6 (IPv6)</title>
<author initials="T" surname="Narten" fullname="T. Narten">
<organization>IBM</organization>
</author>
<author initials="E." surname="Nordmark" fullname="E. Nordmark">
<organization>Sun Microsystems</organization>
</author>
<author initials="W." surname="Simpson" fullname="W. Simpson">
<organization>Daydreamer</organization>
</author>
<author initials="H." surname="Soliman" fullname="H. Soliman">
<organization>Elevate Technologies</organization>
</author>
<date month="September" year="2007"/>
</front>
<seriesInfo name="RFC" value="4861"/>
<format type="HTML" target="http://tools.ietf.org/html/rfc4861"/>
</reference>
<reference anchor="RFC6020">
<front>
<title>YANG - A Data Modeling Language for Network
Configuration Protocol (NETCONF)</title>
<author role="editor" initials="M" surname="Bjorklund" fullname="M. Bjorklund">
<organization>Tail-f Systems</organization>
</author>
<date month="September" year="2010"/>
</front>
<seriesInfo name="RFC" value="6020"/>
<format type="HTML" target="http://tools.ietf.org/html/rfc6020"/>
</reference>
<reference anchor="RFC6021">
<front>
<title>Common YANG Data Types</title>
<author role="editor" initials="J." surname="Schoenwaelder" fullname="J. Schoenwaelder">
<organization/>
</author>
<date month="September" year="2010"/>
</front>
<seriesInfo name="RFC" value="6021"/>
<format type="HTML" target="http://tools.ietf.org/html/rfc6021"/>
</reference>
<reference anchor="RFC6241">
<front>
<title>NETCONF Configuration Protocol</title>
<author initials="R." surname="Enns" fullname="R. Enns">
<organization/>
</author>
<author initials="M." surname="Bjorklund" fullname="M. Bjorklund">
<organization/>
</author>
<author initials="J." surname="Schoenwaelder" fullname="J. Schoenwaelder">
<organization/>
</author>
<author initials="A." surname="Bierman" fullname="A. Bierman">
<organization/>
</author>
<date year="2011" month="June"/>
</front>
<seriesInfo name="RFC" value="6241"/>
<format type="TXT" octets="209465" target="http://www.ietf.org/rfc/rfc6241.txt"/>
</reference>
<reference anchor="YANG-IF">
<front>
<title>A YANG Data Model for Interface Configuration</title>
<author initials="M." surname="Bjorklund" fullname="M. Bjorklund">
<organization/>
</author>
<date month="April" day="29" year="2012"/>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-netmod-interfaces-cfg-04"/>
<format type="HTML" target="http://tools.ietf.org/html/draft-ietf-netmod-interfaces-cfg-04"/>
</reference>
<reference anchor="YANG-IP">
<front>
<title>A YANG Data Model for IP Configuration</title>
<author initials="M." surname="Bjorklund" fullname="M. Bjorklund">
<organization/>
</author>
<date month="April" day="29" year="2012"/>
</front>
<seriesInfo name="Internet-Draft" value="draft-ietf-netmod-ip-cfg-03"/>
<format type="HTML" target="http://tools.ietf.org/html/draft-ietf-netmod-ip-cfg-03"/>
</reference>
</references>
<references title="Informative References">
<reference anchor="RFC6087">
<front>
<title>Guidelines for Authors and Reviewers of YANG Data Model
Documents</title>
<author initials="A." surname="Bierman" fullname="Andy Bierman">
<organization/>
</author>
<date month="January" year="2011"/>
</front>
<seriesInfo name="RFC" value="6087"/>
<format type="HTML" target="http://tools.ietf.org/html/rfc6087"/>
</reference>
<reference anchor="RFC6242">
<front>
<title>Using the NETCONF Protocol over Secure Shell (SSH)</title>
<author initials="M." surname="Wasserman" fullname="M. Wasserman">
<organization/>
</author>
<date year="2011" month="June"/>
</front>
<seriesInfo name="RFC" value="6242"/>
<format type="TXT" octets="22704" target="http://www.ietf.org/rfc/rfc6242.txt"/>
</reference>
</references>
<section anchor="app.rip" title="Example: Adding a New Routing Protocol">
<t>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 <xref target="RFC6087"/>. See also <xref target="sec.newproto"/>.</t>
<figure>
<artwork>
<![CDATA[<CODE BEGINS> file "example-rip@2012-05-24.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.";
}
}
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:active-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
"Time interval between periodic updates.";
}
}
}
}
<CODE ENDS>]]></artwork>
</figure>
</section>
<section anchor="app.get-reply" title="Example: Reply to the NETCONF <get> Message">
<t>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:
<list style="symbols">
<t>ietf-interfaces <xref target="YANG-IF"/>,</t>
<t>ietf-ip <xref target="YANG-IP"/>,</t>
<t>ietf-routing (<xref target="sec.mod-rt"/>),</t>
<t>ietf-ipv4-unicast-routing (<xref target="sec.mod-v4ur"/>),</t>
<t>ietf-ipv6-unicast-routing (<xref target="sec.mod-v6ur"/>).</t>
</list></t>
<t>We assume a simple network setup as shown in <xref target="fig.exnet"/>: 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.</t>
<figure anchor="fig.exnet" title="Example network configuration">
<artwork><![CDATA[
+-----------------+
| |
| 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
|
]]></artwork>
</figure>
<t>Router "A" then could send the following XML document as its
reply to the NETCONF <get> message:</t>
<figure>
<artwork><![CDATA[
<?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: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>
<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: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>
<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>main-ipv4-unicast</rt:name>
</rt:routing-table>
<rt:routing-table>
<rt:name>main-ipv6-unicast</rt:name>
</rt:routing-table>
</rt:connected-routing-tables>
</rt:routing-protocol>
</rt:routing-protocols>
<rt:routing-tables>
<rt:routing-table>
<rt:name>main-ipv4-unicast</rt:name>
<rt:routes>
<rt:route>
<v4ur:dest-prefix>192.0.2.1/24</v4ur:dest-prefix>
<rt:outgoing-interface>eth0</rt:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:age>3512</rt:age>
</rt:route>
<rt:route>
<v4ur:dest-prefix>198.51.100.0/24</v4ur:dest-prefix>
<rt:outgoing-interface>eth1</rt:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:age>3512</rt:age>
</rt:route>
<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:age>2551</rt:age>
</rt:route>
</rt:routes>
</rt:routing-table>
<rt:routing-table>
<rt:name>main-ipv6-unicast</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>
<rt:outgoing-interface>eth0</rt:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:age>3513</rt:age>
</rt:route>
<rt:route>
<v6ur:dest-prefix>2001:db8:0:2::/64</v6ur:dest-prefix>
<rt:outgoing-interface>eth1</rt:outgoing-interface>
<rt:source-protocol>direct</rt:source-protocol>
<rt:age>3513</rt:age>
</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:age>2550</rt:age>
</rt:route>
</rt:routes>
</rt:routing-table>
</rt:routing-tables>
</rt:router>
</rt:routing>
</data>
</rpc-reply>
]]></artwork>
</figure>
</section>
<section anchor="change-log" title="Change Log">
<t>RFC Editor: remove this section upon publication as an RFC.</t>
<section title="Changes Between Versions -02 and -03">
<t>
<list style="symbols">
<t>Module "iana-afn-safi" moved to I-D "iana-if-type".</t>
<t>Removed forwarding table.</t>
<t>RPC "get-route" changed to "active-route". Its output is
a list of routes (for multi-path routing).</t>
<t>New RPC "route-count".</t>
<t>For both RPCs, specification of negative responses was
added.</t>
<t>Relaxed separation of router instances.</t>
<t>Assignment of interfaces to router instances needn't be
disjoint.</t>
<t>Route filters are now global.</t>
<t>Added "allow-all-route-filter" for symmetry.</t>
<t>Added <xref target="sec.interactions"/> about
interactions with "ietf-interfaces" and "ietf-ip".</t>
<t>Added "router-id" leaf.</t>
<t>Specified the names for IPv4/IPv6 unicast main routing
tables.</t>
<t>Route parameter "last-modified" changed to "age".</t>
<t>Added container "recipient-routing-tables".</t>
</list>
</t>
</section>
<section title="Changes Between Versions -01 and -02">
<t><list style="symbols">
<t>Added module "ietf-ipv6-unicast-routing".</t>
<t>The example in <xref target="app.get-reply"/> now uses
IP addresses from blocks reserved for documentation.</t>
<t>Direct routes appear by default in the FIB table.</t>
<t>Network layer interfaces must be assigned to a router
instance. Additional interface configuration may be present.</t>
<t>The "when" statement is only used with "augment", "must" is
used elsewhere.</t>
<t>Additional "must" statements were added.</t>
<t>The "route-content" grouping for IPv4 and IPv6 unicast now
includes the material from the "ietf-routing" version via
"uses rt:route-content".</t>
<t>Explanation of symbols in the tree representation of data
model hierarchy.</t>
</list></t>
</section>
<section title="Changes Between Versions -00 and -01">
<t><list style="symbols">
<t>AFN/SAFI-independent stuff was moved to the "ietf-routing"
module.</t>
<t>Typedefs for AFN and SAFI were placed in a separate
"iana-afn-safi" module.</t>
<t>Names of some data nodes were changed, in particular
"routing-process" is now "router".</t>
<t>The restriction of a single AFN/SAFI per router was
lifted.</t>
<t>RPC operation "delete-route" was removed.</t>
<t>Illegal XPath references from "get-route" to the datastore
were fixed.</t>
<t>Section "Security Considerations" was written.</t>
</list></t>
</section>
</section>
</back>
</rfc>
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