A YANG Data Model for
Routing ManagementCZ.NIClhotka@nic.czCisco Systemsacee@cisco.com
Operations and Management
NETMOD Working GroupconfigurationIPv6 router advertisementsNETCONFRESTCONFThis document contains a specification of three YANG modules
and one submodule. Together they form the core routing data
model that serves as a framework for configuring and managing a
routing subsystem. It is expected that these modules will be
augmented by additional YANG modules defining data models for
control-plane protocols, route filters, and other functions. The core
routing data model provides common building blocks for such
extensions -- routes, Routing Information Bases (RIBs), and
control-plane protocols.This document contains a specification of the following YANG
modules:
The "ietf-routing" module provides generic components of a
routing data model.The "ietf-ipv4-unicast-routing" module augments the
"ietf-routing" module with additional data specific to IPv4
unicast.The "ietf-ipv6-unicast-routing" module augments the
"ietf-routing" module with additional data specific to IPv6
unicast. Its submodule "ietf-ipv6-router-advertisements" also
augments the "ietf-interfaces" and
"ietf-ip" modules with IPv6 router
configuration variables required by .These modules together define the so-called core routing data
model, which is intended as a basis for future data model
development covering more-sophisticated routing systems. While
these three modules can be directly used for simple IP devices
with static routing (see ), their
main purpose is to provide essential building blocks for more-complicated data models involving multiple control-plane protocols,
multicast routing, additional address families, and advanced
functions such as route filtering or policy routing.
To this
end, it is expected that the core routing data model will be
augmented by numerous modules developed by various IETF working
groups.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 .The following terms are defined in :
clientmessageprotocol operationserverThe following terms are defined in :
actionaugmentconfiguration datacontainercontainer with presencedata modeldata nodefeatureleaflistmandatory nodemoduleschema treestate dataRPC (Remote Procedure Call) operation YANG data model
comprising "ietf-routing", "ietf-ipv4-unicast-routing", and
"ietf-ipv6-unicast-routing" modules.a route to a directly connected
network.An object
containing a list of routes together with other
information. See for details.An entry of a list in
state data ("config false") that is created by the system
independently of what has been explicitly configured. See
for details.An entry of a list in
state data ("config false") that is created and deleted as a
direct consequence of certain configuration changes. See
for details.A simplified graphical representation of the complete data
tree is presented in , and similar
diagrams of its various subtrees appear in the main text.Brackets "[" and "]" enclose list keys.Curly braces "{" and "}" contain names of optional features that
make the corresponding node conditional.Abbreviations before data node names: "rw" means configuration
(read-write), "ro" state data (read-only), "-x" RPC operations or
actions, and "-n" notifications.Symbols after data node names: "?" means an optional node, "!" a
container with presence, and "*" denotes a "list" or "leaf-list".Parentheses enclose choice and case nodes, and case nodes are
also marked with a colon (":").Ellipsis ("...") stands for contents of subtrees that are not
shown.In this document, names of data nodes, actions, and other
data model objects are often used 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 .PrefixYANG moduleReferenceifietf-interfacesipietf-iprtietf-routingv4urietf-ipv4-unicast-routingv6urietf-ipv6-unicast-routingyangietf-yang-typesinetietf-inet-typesThe initial design of the core routing data model was driven by
the following objectives:
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).A simple IP routing system, such as one that uses only
static routing, should be configurable in a simple way,
ideally without any need to develop additional YANG
modules.On the other hand, the core routing framework must allow
for complicated implementations involving multiple Routing
Information Bases (RIBs) and multiple control-plane protocols, as
well as controlled redistributions of routing information.
Because device vendors will want to map the data models built on this
generic framework to their proprietary data models and
configuration interfaces, the framework should be
flexible enough to facilitate that and accommodate data
models with different logic.The core routing data model consists of three YANG modules
and one submodule. 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 "ietf-ipv6-unicast-routing" module has a
submodule, "ietf-ipv6-router-advertisements", that augments the
"ietf-interfaces" and "ietf-ip" modules with configuration variables for IPv6
router advertisements as required by . Figures and show abridged views of the configuration and
state data hierarchies. See for
the complete data trees.
+--rw routing
+--rw router-id?
+--rw control-plane-protocols
| +--rw control-plane-protocol* [type name]
| +--rw type
| +--rw name
| +--rw description?
| +--rw static-routes
| +--rw v6ur:ipv6
| | ...
| +--rw v4ur:ipv4
| ...
+--rw ribs
+--rw rib* [name]
+--rw name
+--rw address-family?
+--rw description?
+--ro routing-state
+--ro router-id?
+--ro interfaces
| +--ro interface*
+--ro control-plane-protocols
| +--ro control-plane-protocol* [type name]
| +--ro type
| +--ro name
+--ro ribs
+--ro rib* [name]
+--ro name
+--ro address-family
+--ro default-rib?
+--ro routes
| +--ro route*
| ...
As can be seen from Figures and , the core routing data model introduces
several generic components of a routing framework: routes, RIBs
containing lists of routes, and control-plane protocols. describes these components in
more detail.The core routing data model defines several lists in the
schema tree, such as "rib", that have to be populated with at
least one entry in any properly functioning device, and
additional entries may be configured by a client.In such a list, the server creates the required item as a
so-called system-controlled entry in state data, i.e., inside
the "routing-state" container.An example can be seen in : the
"/routing-state/ribs/rib" list has two
system-controlled entries named "ipv4-master" and
"ipv6-master".Additional entries may be created in the configuration by
a client, e.g., via the NETCONF protocol. These are so-called
user-controlled entries. If the server accepts a configured
user-controlled entry, then this entry also appears in the
state data version of the list.Corresponding entries in both versions of the list (in
state data and configuration) have the same value of the list
key.A client may also provide supplemental configuration of
system-controlled entries. To do so, the client creates a new
entry in the configuration with the desired contents. In order
to bind this entry to the corresponding entry in the state
data list, the key of the configuration entry has to be set to
the same value as the key of the state entry.Deleting a user-controlled entry from the configuration list
results in the removal of the corresponding entry in the
state data list. In contrast, if a system-controlled
entry is deleted from the configuration list, only the extra
configuration specified in that entry is removed but the
corresponding state data entry remains in the list.This section describes the essential components of the core
routing data model.Routes are basic elements of information in a routing
system. The core routing data model defines only the following
minimal set of route attributes:
"destination-prefix": address prefix specifying the set
of destination addresses for which the route may be
used. This attribute is mandatory."route-preference": an integer value (also known as
administrative distance) that is used for selecting a
preferred route among routes with the same destination
prefix. A lower value means a more preferred route."next-hop": determines the outgoing interface and/or
next-hop address(es), or a special operation to be performed with a
packet.Routes are primarily state data that appear as entries of
RIBs () but they may also be found in
configuration data, for example, as manually configured static
routes. In the latter case, configurable route attributes are
generally a subset of attributes defined for RIB routes.Every implementation of the core routing data model manages
one or more Routing Information Bases (RIBs). A RIB is a list
of routes complemented with administrative data. Each RIB
contains only routes of one address family. An address family
is represented by an identity derived from the
"rt:address-family" base identity.In the core routing data model, RIBs are state data
represented as entries of the list
"/routing-state/ribs/rib". The contents of
RIBs are controlled and manipulated by control-plane protocol
operations that may result in route additions, removals, and
modifications. This also includes manipulations via the
"static" and/or "direct" pseudo-protocols; see .For every supported address family, exactly one RIB MUST be
marked as the so-called default RIB to which control-plane
protocols place their routes by default.Simple router implementations that do not advertise the
feature "multiple-ribs" will typically create one
system-controlled RIB per supported address family and mark
it as the default RIB.More-complex router implementations advertising the
"multiple-ribs" feature support multiple RIBs per address
family that can be used for policy routing and other
purposes.The following action (see Section 7.15 of ) is defined for the "rib" list:
active-route -- return the active RIB route for the
destination address that is specified as the action's input
parameter.The core routing data model provides an open-ended
framework for defining multiple control-plane protocol
instances, e.g., for Layer 3 routing protocols. Each control-plane protocol instance MUST be assigned a type, which is an
identity derived from the "rt:control&nbhy;plane-protocol" base
identity. The core routing data model defines two identities
for the direct and static pseudo-protocols ().Multiple control-plane protocol instances of the same type MAY be
configured.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 adjacent routers.Every implementation of the core routing data model MUST
provide exactly one instance of the "direct" pseudo-protocol
type. 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 .A pseudo-protocol of the type "static" allows for specifying
routes manually. It MAY be configured in zero or multiple
instances, although a typical configuration will have exactly
one instance.It is expected that future YANG modules will create data
models for additional control-plane protocol types. Such a new
module has to define the protocol-specific configuration and
state data, and it has to integrate it into the core routing
framework in the following way:
A new identity MUST be defined for the control-plane protocol,
and its base identity MUST be set to "rt:control-plane-protocol"
or to an identity derived from "rt:control&nbhy;plane-protocol".Additional route attributes MAY be defined, preferably in
one place by means of defining a YANG grouping. The new
attributes have to be inserted by augmenting the definitions
of the nodes
/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route
and
/rt:routing-state/rt:ribs/rt:rib/rt:output/rt:route,
and possibly other places in the configuration, state
data, notifications, and input/output parameters of
actions or RPC operations.Configuration parameters and/or state data for the new
protocol can be defined by augmenting the
"control-plane-protocol" data node under both "/routing"
and "/routing-state".By using a "when" statement, the augmented configuration
parameters and state data specific to the new protocol
SHOULD be made conditional and valid only if the value of
"rt:type" or "rt:source&nbhy;protocol" is equal to (or derived
from) the new protocol's identity.It is also RECOMMENDED that protocol-specific data nodes
be encapsulated in an appropriately named container with
presence. Such a container may contain mandatory data nodes
that are otherwise forbidden at the top level of an
augment.The above steps are implemented by the example YANG
module for the Routing Information Protocol (RIP) in .YANG module "ietf-ipv6-router-advertisements" (), which is a submodule of the
"ietf-ipv6-unicast-routing" module, augments the configuration
and state data of IPv6 interfaces with definitions of the
following variables as required by Section 6.2.1 of :
send-advertisementsmax-rtr-adv-intervalmin-rtr-adv-intervalmanaged-flagother-config-flaglink-mtureachable-timeretrans-timercur-hop-limitdefault-lifetimeprefix-list: a list of prefixes to be advertised.The
following parameters are associated with each prefix in the
list:
valid-lifetimeon-link-flagpreferred-lifetimeautonomous-flagNOTES:The "IsRouter" flag, which is also required by , is implemented in the "ietf-ip" module
(leaf "ip:forwarding").The original specification
allows the implementations to decide whether the
"valid-lifetime" and "preferred-lifetime" parameters remain
the same in consecutive advertisements or decrement in real
time. However, the latter behavior seems problematic because
the values might be reset again to the (higher) configured
values after a configuration is reloaded. Moreover, no
implementation is known to use the decrementing
behavior. The "ietf-ipv6-router-advertisements" submodule
therefore stipulates the former behavior with constant
values.The semantics of the core routing data model also depends on
several configuration parameters that are defined in other YANG
modules.The following boolean switch is defined in the
"ietf-interfaces" YANG module :
If this switch is set to "false" for a network-layer
interface, then all routing and forwarding functions MUST
be disabled on this interface.
The following boolean switches are defined in the "ietf-ip"
YANG module :
If this switch is set to "false" for a network-layer
interface, then all IPv4 routing and forwarding functions
MUST be disabled on this interface.
If this switch is set to "false" for a network-layer
interface, then the forwarding of IPv4 datagrams through
this interface MUST be disabled. However, the interface MAY
participate in other IPv4 routing functions, such as routing
protocols.
If this switch is set to "false" for a network-layer
interface, then all IPv6 routing and forwarding functions
MUST be disabled on this interface.
If this switch is set to "false" for a network-layer
interface, then the forwarding of IPv6 datagrams through
this interface MUST be disabled. However, the interface MAY
participate in other IPv6 routing functions, such as routing
protocols.
In addition, the "ietf-ip" module allows for configuring IPv4
and IPv6 addresses and network prefixes or masks on network-layer
interfaces. Configuration of these parameters on an
enabled interface MUST result in an immediate creation of the
corresponding direct route. The destination prefix of this route
is set according to the configured IP address and network
prefix/mask, and the interface is set as the outgoing interface
for that route.
<CODE BEGINS> file "ietf-routing@2016-11-04.yang"
module ietf-routing {
yang-version "1.1";
namespace "urn:ietf:params:xml:ns:yang:ietf-routing";
prefix "rt";
import ietf-yang-types {
prefix "yang";
}
import ietf-interfaces {
prefix "if";
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: Lou Berger
<mailto:lberger@labn.net>
WG Chair: Kent Watsen
<mailto:kwatsen@juniper.net>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
Editor: Acee Lindem
<mailto:acee@cisco.com>";
description
"This YANG module defines essential components for the management
of a routing subsystem.
Copyright (c) 2016 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).
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'MAY', and
'OPTIONAL' in the module text are to be interpreted as described
in RFC 2119.
This version of this YANG module is part of RFC 8022;
see the RFC itself for full legal notices.";
revision 2016-11-04 {
description
"Initial revision.";
reference
"RFC 8022: A YANG Data Model for Routing Management";
}
/* Features */
feature multiple-ribs {
description
"This feature indicates that the server supports user-defined
RIBs.
Servers that do not advertise this feature SHOULD provide
exactly one system-controlled RIB per supported address family
and make it also the default RIB. This RIB then appears as an
entry of the list /routing-state/ribs/rib.";
}
feature router-id {
description
"This feature indicates that the server supports configuration
of an explicit 32-bit router ID that is used by some routing
protocols.
Servers that do not advertise this feature set a router ID
algorithmically, usually to one of the configured IPv4
addresses. However, this algorithm is implementation
specific.";
}
/* Identities */
identity address-family {
description
"Base identity from which identities describing address
families are derived.";
}
identity ipv4 {
base address-family;
description
"This identity represents IPv4 address family.";
}
identity ipv6 {
base address-family;
description
"This identity represents IPv6 address family.";
}
identity control-plane-protocol {
description
"Base identity from which control-plane protocol identities are
derived.";
}
identity routing-protocol {
base control-plane-protocol;
description
"Identity from which Layer 3 routing protocol identities are
derived.";
}
identity direct {
base routing-protocol;
description
"Routing pseudo-protocol that provides routes to directly
connected networks.";
}
identity static {
base routing-protocol;
description
"Static routing pseudo-protocol.";
}
/* Type Definitions */
typedef route-preference {
type uint32;
description
"This type is used for route preferences.";
}
/* Groupings */
grouping address-family {
description
"This grouping provides a leaf identifying an address
family.";
leaf address-family {
type identityref {
base address-family;
}
mandatory "true";
description
"Address family.";
}
}
grouping router-id {
description
"This grouping provides router ID.";
leaf router-id {
type yang:dotted-quad;
description
"A 32-bit number in the form of a dotted quad that is used by
some routing protocols identifying a router.";
reference
"RFC 2328: OSPF Version 2.";
}
}
grouping special-next-hop {
description
"This grouping provides a leaf with an enumeration of special
next hops.";
leaf special-next-hop {
type enumeration {
enum blackhole {
description
"Silently discard the packet.";
}
enum unreachable {
description
"Discard the packet and notify the sender with an error
message indicating that the destination host is
unreachable.";
}
enum prohibit {
description
"Discard the packet and notify the sender with an error
message indicating that the communication is
administratively prohibited.";
}
enum receive {
description
"The packet will be received by the local system.";
}
}
description
"Options for special next hops.";
}
}
grouping next-hop-content {
description
"Generic parameters of next hops in static routes.";
choice next-hop-options {
mandatory "true";
description
"Options for next hops in static routes.
It is expected that further cases will be added through
augments from other modules.";
case simple-next-hop {
description
"This case represents a simple next hop consisting of the
next-hop address and/or outgoing interface.
Modules for address families MUST augment this case with a
leaf containing a next-hop address of that address
family.";
leaf outgoing-interface {
type if:interface-ref;
description
"Name of the outgoing interface.";
}
}
case special-next-hop {
uses special-next-hop;
}
case next-hop-list {
container next-hop-list {
description
"Container for multiple next-hops.";
list next-hop {
key "index";
description
"An entry of a next-hop list.
Modules for address families MUST augment this list
with a leaf containing a next-hop address of that
address family.";
leaf index {
type string;
description
"A user-specified identifier utilized to uniquely
reference the next-hop entry in the next-hop list.
The value of this index has no semantic meaning
other than for referencing the entry.";
}
leaf outgoing-interface {
type if:interface-ref;
description
"Name of the outgoing interface.";
}
}
}
}
}
}
grouping next-hop-state-content {
description
"Generic parameters of next hops in state data.";
choice next-hop-options {
mandatory "true";
description
"Options for next hops in state data.
It is expected that further cases will be added through
augments from other modules, e.g., for recursive
next hops.";
case simple-next-hop {
description
"This case represents a simple next hop consisting of the
next-hop address and/or outgoing interface.
Modules for address families MUST augment this case with a
leaf containing a next-hop address of that address
family.";
leaf outgoing-interface {
type if:interface-state-ref;
description
"Name of the outgoing interface.";
}
}
case special-next-hop {
uses special-next-hop;
}
case next-hop-list {
container next-hop-list {
description
"Container for multiple next hops.";
list next-hop {
description
"An entry of a next-hop list.
Modules for address families MUST augment this list
with a leaf containing a next-hop address of that
address family.";
leaf outgoing-interface {
type if:interface-state-ref;
description
"Name of the outgoing interface.";
}
}
}
}
}
}
grouping route-metadata {
description
"Common route metadata.";
leaf source-protocol {
type identityref {
base routing-protocol;
}
mandatory "true";
description
"Type of the routing protocol from which the route
originated.";
}
leaf active {
type empty;
description
"Presence of this leaf indicates that the route is preferred
among all routes in the same RIB that have the same
destination prefix.";
}
leaf last-updated {
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 into the RIB.";
}
}
/* State data */
container routing-state {
config "false";
description
"State data of the routing subsystem.";
uses router-id {
description
"Global router ID.
It may be either configured or assigned algorithmically by
the implementation.";
}
container interfaces {
description
"Network-layer interfaces used for routing.";
leaf-list interface {
type if:interface-state-ref;
description
"Each entry is a reference to the name of a configured
network-layer interface.";
}
}
container control-plane-protocols {
description
"Container for the list of routing protocol instances.";
list control-plane-protocol {
key "type name";
description
"State data of a control-plane protocol instance.
An implementation MUST provide exactly one
system-controlled instance of the 'direct'
pseudo-protocol. Instances of other control-plane
protocols MAY be created by configuration.";
leaf type {
type identityref {
base control-plane-protocol;
}
description
"Type of the control-plane protocol.";
}
leaf name {
type string;
description
"The name of the control-plane protocol instance.
For system-controlled instances this name is persistent,
i.e., it SHOULD NOT change across reboots.";
}
}
}
container ribs {
description
"Container for RIBs.";
list rib {
key "name";
min-elements "1";
description
"Each entry represents a RIB identified by the 'name' key.
All routes in a RIB MUST belong to the same address
family.
An implementation SHOULD provide one system-controlled
default RIB for each supported address family.";
leaf name {
type string;
description
"The name of the RIB.";
}
uses address-family;
leaf default-rib {
if-feature "multiple-ribs";
type boolean;
default "true";
description
"This flag has the value of 'true' if and only if the RIB
is the default RIB for the given address family.
By default, control-plane protocols place their routes
in the default RIBs.";
}
container routes {
description
"Current content of the RIB.";
list route {
description
"A RIB route entry. This data node MUST be augmented
with information specific for routes of each address
family.";
leaf route-preference {
type route-preference;
description
"This route attribute, also known as administrative
distance, allows for selecting the preferred route
among routes with the same destination prefix. A
smaller value means a more preferred route.";
}
container next-hop {
description
"Route's next-hop attribute.";
uses next-hop-state-content;
}
uses route-metadata;
}
}
action active-route {
description
"Return the active RIB route that is used for the
destination address.
Address-family-specific modules MUST augment input
parameters with a leaf named 'destination-address'.";
output {
container route {
description
"The active RIB route for the specified destination.
If no route exists in the RIB for the destination
address, no output is returned.
Address-family-specific modules MUST augment this
container with appropriate route contents.";
container next-hop {
description
"Route's next-hop attribute.";
uses next-hop-state-content;
}
uses route-metadata;
}
}
}
}
}
}
/* Configuration Data */
container routing {
description
"Configuration parameters for the routing subsystem.";
uses router-id {
if-feature "router-id";
description
"Configuration of the global router ID. Routing protocols
that use router ID can use this parameter or override it
with another value.";
}
container control-plane-protocols {
description
"Configuration of control-plane protocol instances.";
list control-plane-protocol {
key "type name";
description
"Each entry contains configuration of a control-plane
protocol instance.";
leaf type {
type identityref {
base control-plane-protocol;
}
description
"Type of the control-plane protocol - an identity derived
from the 'control-plane-protocol' base identity.";
}
leaf name {
type string;
description
"An arbitrary name of the control-plane protocol
instance.";
}
leaf description {
type string;
description
"Textual description of the control-plane protocol
instance.";
}
container static-routes {
when "derived-from-or-self(../type, 'rt:static')" {
description
"This container is only valid for the 'static' routing
protocol.";
}
description
"Configuration of the 'static' pseudo-protocol.
Address-family-specific modules augment this node with
their lists of routes.";
}
}
}
container ribs {
description
"Configuration of RIBs.";
list rib {
key "name";
description
"Each entry contains configuration for a RIB identified by
the 'name' key.
Entries having the same key as a system-controlled entry
of the list /routing-state/ribs/rib are used for
configuring parameters of that entry. Other entries
define additional user-controlled RIBs.";
leaf name {
type string;
description
"The name of the RIB.
For system-controlled entries, the value of this leaf
must be the same as the name of the corresponding entry
in state data.
For user-controlled entries, an arbitrary name can be
used.";
}
uses address-family {
description
"Address family of the RIB.
It is mandatory for user-controlled RIBs. For
system-controlled RIBs it can be omitted; otherwise, it
must match the address family of the corresponding state
entry.";
refine "address-family" {
mandatory "false";
}
}
leaf description {
type string;
description
"Textual description of the RIB.";
}
}
}
}
}
<CODE ENDS>
<CODE BEGINS> file "ietf-ipv4-unicast-routing@2016-11-04.yang"
module ietf-ipv4-unicast-routing {
yang-version "1.1";
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: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: Lou Berger
<mailto:lberger@labn.net>
WG Chair: Kent Watsen
<mailto:kwatsen@juniper.net>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
Editor: Acee Lindem
<mailto:acee@cisco.com>";
description
"This YANG module augments the 'ietf-routing' module with basic
configuration and state data for IPv4 unicast routing.
Copyright (c) 2016 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).
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'MAY', and
'OPTIONAL' in the module text are to be interpreted as described
in RFC 2119.
This version of this YANG module is part of RFC 8022;
see the RFC itself for full legal notices.";
revision 2016-11-04 {
description
"Initial revision.";
reference
"RFC 8022: A YANG Data Model for Routing Management";
}
/* Identities */
identity ipv4-unicast {
base rt:ipv4;
description
"This identity represents the IPv4 unicast address family.";
}
/* State data */
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
when "derived-from-or-self(../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"This leaf augments an IPv4 unicast route.";
leaf destination-prefix {
type inet:ipv4-prefix;
description
"IPv4 destination prefix.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
+ "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
when "derived-from-or-self(../../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"Augment 'simple-next-hop' case in IPv4 unicast routes.";
leaf next-hop-address {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
+ "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
+ "rt:next-hop-list/rt:next-hop" {
when "derived-from-or-self(../../../../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"This leaf augments the 'next-hop-list' case of IPv4 unicast
routes.";
leaf address {
type inet:ipv4-address;
description
"IPv4 address of the next-hop.";
}
}
augment
"/rt:routing-state/rt:ribs/rt:rib/rt:active-route/rt:input" {
when "derived-from-or-self(../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast RIBs.";
}
description
"This augment adds the input parameter of the 'active-route'
action.";
leaf destination-address {
type inet:ipv4-address;
description
"IPv4 destination address.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route" {
when "derived-from-or-self(../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"This augment adds the destination prefix to the reply of the
'active-route' action.";
leaf destination-prefix {
type inet:ipv4-prefix;
description
"IPv4 destination prefix.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
+ "rt:simple-next-hop" {
when "derived-from-or-self(../../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"Augment 'simple-next-hop' case in the reply to the
'active-route' action.";
leaf next-hop-address {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
+ "rt:next-hop-list/rt:next-hop-list/rt:next-hop" {
when "derived-from-or-self(../../../../../rt:address-family, "
+ "'v4ur:ipv4-unicast')" {
description
"This augment is valid only for IPv4 unicast.";
}
description
"Augment 'next-hop-list' case in the reply to the
'active-route' action.";
leaf next-hop-address {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
/* Configuration data */
augment "/rt:routing/rt:control-plane-protocols/"
+ "rt:control-plane-protocol/rt:static-routes" {
description
"This augment defines the configuration of the 'static'
pseudo-protocol with data specific to IPv4 unicast.";
container ipv4 {
description
"Configuration of a 'static' pseudo-protocol instance
consists of a list of routes.";
list route {
key "destination-prefix";
description
"A list of static routes.";
leaf destination-prefix {
type inet:ipv4-prefix;
mandatory "true";
description
"IPv4 destination prefix.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
container next-hop {
description
"Configuration of next-hop.";
uses rt:next-hop-content {
augment "next-hop-options/simple-next-hop" {
description
"Augment 'simple-next-hop' case in IPv4 static
routes.";
leaf next-hop-address {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
augment "next-hop-options/next-hop-list/next-hop-list/"
+ "next-hop" {
description
"Augment 'next-hop-list' case in IPv4 static
routes.";
leaf next-hop-address {
type inet:ipv4-address;
description
"IPv4 address of the next hop.";
}
}
}
}
}
}
}
}
<CODE ENDS>
<CODE BEGINS> file "ietf-ipv6-unicast-routing@2016-11-04.yang"
module ietf-ipv6-unicast-routing {
yang-version "1.1";
namespace "urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing";
prefix "v6ur";
import ietf-routing {
prefix "rt";
}
import ietf-inet-types {
prefix "inet";
}
include ietf-ipv6-router-advertisements {
revision-date 2016-11-04;
}
organization
"IETF NETMOD (NETCONF Data Modeling Language) Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: Lou Berger
<mailto:lberger@labn.net>
WG Chair: Kent Watsen
<mailto:kwatsen@juniper.net>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
Editor: Acee Lindem
<mailto:acee@cisco.com>";
description
"This YANG module augments the 'ietf-routing' module with basic
configuration and state data for IPv6 unicast routing.
Copyright (c) 2016 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).
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'MAY', and
'OPTIONAL' in the module text are to be interpreted as described
in RFC 2119.
This version of this YANG module is part of RFC 8022;
see the RFC itself for full legal notices.";
revision 2016-11-04 {
description
"Initial revision.";
reference
"RFC 8022: A YANG Data Model for Routing Management";
}
/* Identities */
identity ipv6-unicast {
base rt:ipv6;
description
"This identity represents the IPv6 unicast address family.";
}
/* State data */
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
when "derived-from-or-self(../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"This leaf augments an IPv6 unicast route.";
leaf destination-prefix {
type inet:ipv6-prefix;
description
"IPv6 destination prefix.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
+ "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
when "derived-from-or-self(../../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"Augment 'simple-next-hop' case in IPv6 unicast routes.";
leaf next-hop-address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
+ "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
+ "rt:next-hop-list/rt:next-hop" {
when "derived-from-or-self(../../../../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"This leaf augments the 'next-hop-list' case of IPv6 unicast
routes.";
leaf address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
augment
"/rt:routing-state/rt:ribs/rt:rib/rt:active-route/rt:input" {
when "derived-from-or-self(../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast RIBs.";
}
description
"This augment adds the input parameter of the 'active-route'
action.";
leaf destination-address {
type inet:ipv6-address;
description
"IPv6 destination address.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route" {
when "derived-from-or-self(../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"This augment adds the destination prefix to the reply of the
'active-route' action.";
leaf destination-prefix {
type inet:ipv6-prefix;
description
"IPv6 destination prefix.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
+ "rt:simple-next-hop" {
when "derived-from-or-self(../../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"Augment 'simple-next-hop' case in the reply to the
'active-route' action.";
leaf next-hop-address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
+ "rt:next-hop-list/rt:next-hop-list/rt:next-hop" {
when "derived-from-or-self(../../../../../rt:address-family, "
+ "'v6ur:ipv6-unicast')" {
description
"This augment is valid only for IPv6 unicast.";
}
description
"Augment 'next-hop-list' case in the reply to the
'active-route' action.";
leaf next-hop-address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
/* Configuration data */
augment "/rt:routing/rt:control-plane-protocols/"
+ "rt:control-plane-protocol/rt:static-routes" {
description
"This augment defines the configuration of the 'static'
pseudo-protocol with data specific to IPv6 unicast.";
container ipv6 {
description
"Configuration of a 'static' pseudo-protocol instance
consists of a list of routes.";
list route {
key "destination-prefix";
description
"A list of static routes.";
leaf destination-prefix {
type inet:ipv6-prefix;
mandatory "true";
description
"IPv6 destination prefix.";
}
leaf description {
type string;
description
"Textual description of the route.";
}
container next-hop {
description
"Configuration of next-hop.";
uses rt:next-hop-content {
augment "next-hop-options/simple-next-hop" {
description
"Augment 'simple-next-hop' case in IPv6 static
routes.";
leaf next-hop-address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
augment "next-hop-options/next-hop-list/next-hop-list/"
+ "next-hop" {
description
"Augment 'next-hop-list' case in IPv6 static
routes.";
leaf next-hop-address {
type inet:ipv6-address;
description
"IPv6 address of the next hop.";
}
}
}
}
}
}
}
}
<CODE ENDS>
<CODE BEGINS> file "ietf-ipv6-router-advertisements@2016-11-04.yang"
submodule ietf-ipv6-router-advertisements {
yang-version "1.1";
belongs-to ietf-ipv6-unicast-routing {
prefix "v6ur";
}
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: <https://datatracker.ietf.org/wg/netmod/>
WG List: <mailto:netmod@ietf.org>
WG Chair: Lou Berger
<mailto:lberger@labn.net>
WG Chair: Kent Watsen
<mailto:kwatsen@juniper.net>
Editor: Ladislav Lhotka
<mailto:lhotka@nic.cz>
Editor: Acee Lindem
<mailto:acee@cisco.com>";
description
"This YANG module augments the 'ietf-ip' module with
configuration and state data of IPv6 router advertisements.
Copyright (c) 2016 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).
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'MAY', and
'OPTIONAL' in the module text are to be interpreted as described
in RFC 2119.
This version of this YANG module is part of RFC 8022;
see the RFC itself for full legal notices.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6).";
revision 2016-11-04 {
description
"Initial revision.";
reference
"RFC 8022: A YANG Data Model for Routing Management";
}
/* State data */
augment "/if:interfaces-state/if:interface/ip:ipv6" {
description
"Augment interface state data with parameters of IPv6 router
advertisements.";
container ipv6-router-advertisements {
description
"Parameters of IPv6 Router Advertisements.";
leaf send-advertisements {
type boolean;
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";
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.";
}
leaf managed-flag {
type boolean;
description
"The value that is placed in the 'Managed address
configuration' flag field in the Router Advertisement.";
}
leaf other-config-flag {
type boolean;
description
"The value that is placed in the 'Other configuration' flag
field in the Router Advertisement.";
}
leaf link-mtu {
type uint32;
description
"The value that is 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";
description
"The value that is placed in the Reachable Time field in
the Router Advertisement messages sent by the router. A
value of zero means unspecified (by this router).";
}
leaf retrans-timer {
type uint32;
units "milliseconds";
description
"The value that is placed in the Retrans Timer field in the
Router Advertisement messages sent by the router. A value
of zero means unspecified (by this router).";
}
leaf cur-hop-limit {
type uint8;
description
"The value that is placed in the Cur Hop Limit field in the
Router Advertisement messages sent by the router. A value
of zero means unspecified (by this router).";
}
leaf default-lifetime {
type uint16 {
range "0..9000";
}
units "seconds";
description
"The value that is placed in the Router Lifetime field of
Router Advertisements sent from the interface, in seconds.
A value of zero indicates that the router is not to be
used as a default router.";
}
container prefix-list {
description
"A list of prefixes that are placed in Prefix Information
options in Router Advertisement messages sent from the
interface.
By default, these are all prefixes that the router
advertises via routing protocols as being on-link for the
interface from which the advertisement is sent.";
list prefix {
key "prefix-spec";
description
"Advertised prefix entry and its parameters.";
leaf prefix-spec {
type inet:ipv6-prefix;
description
"IPv6 address prefix.";
}
leaf valid-lifetime {
type uint32;
units "seconds";
description
"The value that is placed in the Valid Lifetime in the
Prefix Information option. The designated value of
all 1's (0xffffffff) represents infinity.
An implementation SHOULD keep this value constant in
consecutive advertisements except when it is
explicitly changed in configuration.";
}
leaf on-link-flag {
type boolean;
description
"The value that is placed in the on-link flag ('L-bit')
field in the Prefix Information option.";
}
leaf preferred-lifetime {
type uint32;
units "seconds";
description
"The value that is placed in the Preferred Lifetime in
the Prefix Information option, in seconds. The
designated value of all 1's (0xffffffff) represents
infinity.
An implementation SHOULD keep this value constant in
consecutive advertisements except when it is
explicitly changed in configuration.";
}
leaf autonomous-flag {
type boolean;
description
"The value that is placed in the Autonomous Flag field
in the Prefix Information option.";
}
}
}
}
}
/* Configuration data */
augment "/if:interfaces/if:interface/ip:ipv6" {
description
"Augment interface configuration with parameters of IPv6 router
advertisements.";
container ipv6-router-advertisements {
description
"Configuration of IPv6 Router Advertisements.";
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.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvSendAdvertisements.";
}
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.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
MaxRtrAdvInterval.";
}
leaf min-rtr-adv-interval {
type uint16 {
range "3..1350";
}
units "seconds";
must ". <= 0.75 * ../max-rtr-adv-interval" {
description
"The value MUST NOT be greater than 75% of
'max-rtr-adv-interval'.";
}
description
"The minimum time allowed between sending unsolicited
multicast Router Advertisements from the interface.
The default value to be used operationally if this leaf is
not configured is determined as follows:
- 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.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
MinRtrAdvInterval.";
}
leaf managed-flag {
type boolean;
default "false";
description
"The value to be placed in the 'Managed address
configuration' flag field in the Router Advertisement.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvManagedFlag.";
}
leaf other-config-flag {
type boolean;
default "false";
description
"The value to be placed in the 'Other configuration' flag
field in the Router Advertisement.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvOtherConfigFlag.";
}
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.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvLinkMTU.";
}
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. A value
of zero means unspecified (by this router).";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvReachableTime.";
}
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. A value
of zero means unspecified (by this router).";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvRetransTimer.";
}
leaf cur-hop-limit {
type uint8;
description
"The value to be placed in the Cur Hop Limit field in the
Router Advertisement messages sent by the router. A value
of zero means unspecified (by this router).
If this parameter is not configured, the device SHOULD use
the value specified in IANA Assigned Numbers that was in
effect at the time of implementation.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvCurHopLimit.
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.
It 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.
If this parameter is not configured, the device SHOULD use
a value of 3 * max-rtr-adv-interval.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvDefaultLifeTime.";
}
container prefix-list {
description
"Configuration of prefixes to be placed in Prefix
Information options in Router Advertisement messages sent
from the interface.
Prefixes that are advertised by default but do not have
their entries in the child 'prefix' list are advertised
with the default values of all parameters.
The link-local prefix SHOULD NOT be included in the list
of advertised prefixes.";
reference
"RFC 4861: Neighbor Discovery for IP version 6 (IPv6) -
AdvPrefixList.";
list prefix {
key "prefix-spec";
description
"Configuration of an advertised prefix entry.";
leaf prefix-spec {
type inet:ipv6-prefix;
description
"IPv6 address prefix.";
}
choice control-adv-prefixes {
default "advertise";
description
"Either the prefix is explicitly removed from the
set of advertised prefixes, or the parameters with
which it is advertised are specified (default case).";
leaf no-advertise {
type empty;
description
"The prefix will not be advertised.
This can 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. The designated
value of all 1's (0xffffffff) represents
infinity.";
reference
"RFC 4861: Neighbor Discovery for IP version 6
(IPv6) - AdvValidLifetime.";
}
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.";
reference
"RFC 4861: Neighbor Discovery for IP version 6
(IPv6) - AdvOnLinkFlag.";
}
leaf preferred-lifetime {
type uint32;
units "seconds";
must ". <= ../valid-lifetime" {
description
"This value MUST NOT be greater than
valid-lifetime.";
}
default "604800";
description
"The value to be placed in the Preferred Lifetime
in the Prefix Information option. The designated
value of all 1's (0xffffffff) represents
infinity.";
reference
"RFC 4861: Neighbor Discovery for IP version 6
(IPv6) - AdvPreferredLifetime.";
}
leaf autonomous-flag {
type boolean;
default "true";
description
"The value to be placed in the Autonomous Flag
field in the Prefix Information option.";
reference
"RFC 4861: Neighbor Discovery for IP version 6
(IPv6) - AdvAutonomousFlag.";
}
}
}
}
}
}
}
}
<CODE ENDS>This document registers the following namespace URIs in the
"IETF XML Registry" :
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.
This document registers the following YANG modules in the "YANG
Module Names" registry :
Name: ietf-routing
Namespace: urn:ietf:params:xml:ns:yang:ietf-routing
Prefix: rt
Reference: RFC 8022
Name: ietf-ipv4-unicast-routing
Namespace: urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing
Prefix: v4ur
Reference: RFC 8022
Name: ietf-ipv6-unicast-routing
Namespace: urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing
Prefix: v6ur
Reference: RFC 8022
This document registers the following YANG submodule in the "YANG
Module Names" registry :
Name: ietf-ipv6-router-advertisements
Module: ietf-ipv6-unicast-routing
Reference: RFC 8022
Configuration and state data conforming to the core routing
data model (defined in this document) are designed to be
accessed via a management protocol with a secure transport layer,
such as NETCONF . The NETCONF access
control model provides the means to
restrict access for particular NETCONF users to a preconfigured
subset of all available NETCONF protocol operations and
content.A number of configuration data nodes defined in the YANG
modules belonging to the core routing data model 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" in
NETCONF, can have negative effects on the network if the
protocol operations are not properly protected.The vulnerable "config true" parameters and subtrees are the
following:
This
list specifies the control-plane protocols configured on a
device.This list
specifies the RIBs configured for the device.
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.This appendix presents the complete configuration and
state data trees of the core routing data model.
See for an explanation of the
symbols used. The data type of every leaf node is shown near the right
end of the corresponding line.
+--rw routing
+--rw router-id? yang:dotted-quad
+--rw control-plane-protocols
| +--rw control-plane-protocol* [type name]
| +--rw type identityref
| +--rw name string
| +--rw description? string
| +--rw static-routes
| +--rw v6ur:ipv6
| | +--rw v6ur:route* [destination-prefix]
| | +--rw v6ur:destination-prefix inet:ipv6-prefix
| | +--rw v6ur:description? string
| | +--rw v6ur:next-hop
| | +--rw (v6ur:next-hop-options)
| | +--:(v6ur:simple-next-hop)
| | | +--rw v6ur:outgoing-interface?
| | | +--rw v6ur:next-hop-address?
| | +--:(v6ur:special-next-hop)
| | | +--rw v6ur:special-next-hop? enumeration
| | +--:(v6ur:next-hop-list)
| | +--rw v6ur:next-hop-list
| | +--rw v6ur:next-hop* [index]
| | +--rw v6ur:index string
| | +--rw v6ur:outgoing-interface?
| | +--rw v6ur:next-hop-address?
| +--rw v4ur:ipv4
| +--rw v4ur:route* [destination-prefix]
| +--rw v4ur:destination-prefix inet:ipv4-prefix
| +--rw v4ur:description? string
| +--rw v4ur:next-hop
| +--rw (v4ur:next-hop-options)
| +--:(v4ur:simple-next-hop)
| | +--rw v4ur:outgoing-interface?
| | +--rw v4ur:next-hop-address?
| +--:(v4ur:special-next-hop)
| | +--rw v4ur:special-next-hop? enumeration
| +--:(v4ur:next-hop-list)
| +--rw v4ur:next-hop-list
| +--rw v4ur:next-hop* [index]
| +--rw v4ur:index string
| +--rw v4ur:outgoing-interface?
| +--rw v4ur:next-hop-address?
+--rw ribs
+--rw rib* [name]
+--rw name string
+--rw address-family? identityref
+--rw description? string
+--ro routing-state
| +--ro router-id? yang:dotted-quad
| +--ro interfaces
| | +--ro interface* if:interface-state-ref
| +--ro control-plane-protocols
| | +--ro control-plane-protocol* [type name]
| | +--ro type identityref
| | +--ro name string
| +--ro ribs
| +--ro rib* [name]
| +--ro name string
| +--ro address-family identityref
| +--ro default-rib? boolean {multiple-ribs}?
| +--ro routes
| | +--ro route*
| | +--ro route-preference? route-preference
| | +--ro next-hop
| | | +--ro (next-hop-options)
| | | +--:(simple-next-hop)
| | | | +--ro outgoing-interface?
| | | | +--ro v6ur:next-hop-address?
| | | | +--ro v4ur:next-hop-address?
| | | +--:(special-next-hop)
| | | | +--ro special-next-hop? enumeration
| | | +--:(next-hop-list)
| | | +--ro next-hop-list
| | | +--ro next-hop*
| | | +--ro outgoing-interface?
| | | +--ro v6ur:address?
| | | +--ro v4ur:address?
| | +--ro source-protocol identityref
| | +--ro active? empty
| | +--ro last-updated? yang:date-and-time
| | +--ro v6ur:destination-prefix? inet:ipv6-prefix
| | +--ro v4ur:destination-prefix? inet:ipv4-prefix
| +---x active-route
| +---w input
| | +---w v6ur:destination-address? inet:ipv6-address
| | +---w v4ur:destination-address? inet:ipv4-address
| +--ro output
| +--ro route
| +--ro next-hop
| | +--ro (next-hop-options)
| | +--:(simple-next-hop)
| | | +--ro outgoing-interface?
| | | +--ro v6ur:next-hop-address?
| | | +--ro v4ur:next-hop-address?
| | +--:(special-next-hop)
| | | +--ro special-next-hop? enumeration
| | +--:(next-hop-list)
| | +--ro next-hop-list
| | +--ro next-hop*
| | +--ro outgoing-interface?
| | +--ro v6ur:next-hop-address?
| | +--ro v4ur:next-hop-address?
| +--ro source-protocol identityref
| +--ro active? empty
| +--ro last-updated? yang:date-and-time
| +--ro v6ur:destination-prefix? inet:ipv6-prefix
| +--ro v4ur:destination-prefix? inet:ipv4-prefix
Some parts and options of the core routing model, such as
user-defined RIBs, are intended only for advanced routers. This
appendix gives basic non-normative guidelines for implementing a
bare minimum of available functions. Such an implementation may
be used for hosts or very simple routers.A minimum implementation does not support the feature
"multiple&nbhy;ribs". This means that a single system-controlled RIB
is available for each supported address family -- IPv4, IPv6, or
both. These RIBs are also the default RIBs. No user-controlled
RIBs are allowed.In addition to the mandatory instance of the "direct"
pseudo-protocol, a minimum implementation should support
configuring instance(s) of the "static" pseudo-protocol.For hosts that are never intended to act as routers, the
ability to turn on sending IPv6 router advertisements () should be removed.Platforms with severely constrained resources may use
deviations for restricting the data model, e.g., limiting the
number of "static" control-plane protocol instances.This appendix demonstrates how the core routing data model
can be extended to support a new control-plane protocol. The YANG
module "example-rip" shown below is intended as an illustration
rather than a real definition of a data model for the Routing
Information Protocol (RIP). For the sake of brevity, this module does not
obey all the guidelines specified in . See also .
module example-rip {
yang-version "1.1";
namespace "http://example.com/rip";
prefix "rip";
import ietf-interfaces {
prefix "if";
}
import ietf-routing {
prefix "rt";
}
identity rip {
base rt:routing-protocol;
description
"Identity for the Routing Information Protocol (RIP).";
}
typedef rip-metric {
type uint8 {
range "0..16";
}
}
grouping route-content {
description
"This grouping defines RIP-specific route attributes.";
leaf metric {
type rip-metric;
}
leaf tag {
type uint16;
default "0";
description
"This leaf may be used to carry additional info, e.g.,
autonomous system (AS) number.";
}
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
when "derived-from-or-self(rt:source-protocol, 'rip:rip')" {
description
"This augment is only valid for a route whose source
protocol is RIP.";
}
description
"RIP-specific route attributes.";
uses route-content;
}
augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
+ "rt:output/rt:route" {
description
"RIP-specific route attributes in the output of 'active-route'
RPC.";
uses route-content;
}
augment "/rt:routing/rt:control-plane-protocols/"
+ "rt:control-plane-protocol" {
when "derived-from-or-self(rt:type,'rip:rip')" {
description
"This augment is only valid for a routing protocol instance
of type 'rip'.";
}
container rip {
presence "RIP configuration";
description
"RIP instance configuration.";
container interfaces {
description
"Per-interface RIP configuration.";
list interface {
key "name";
description
"RIP is enabled on interfaces that have an entry in this
list, unless 'enabled' is set to 'false' for that
entry.";
leaf name {
type if:interface-ref;
}
leaf enabled {
type boolean;
default "true";
}
leaf metric {
type rip-metric;
default "1";
}
}
}
leaf update-interval {
type uint8 {
range "10..60";
}
units "seconds";
default "30";
description
"Time interval between periodic updates.";
}
}
}
}
This section contains an example of an instance data tree in the
JSON encoding ,
containing both configuration and state data. The data conforms
to a data model that is defined by the following YANG library
specification :
{
"ietf-yang-library:modules-state": {
"module-set-id": "c2e1f54169aa7f36e1a6e8d0865d441d3600f9c4",
"module": [
{
"name": "ietf-routing",
"revision": "2016-11-04",
"feature": [
"multiple-ribs",
"router-id"
],
"namespace": "urn:ietf:params:xml:ns:yang:ietf-routing",
"conformance-type": "implement"
},
{
"name": "ietf-ipv4-unicast-routing",
"revision": "2016-11-04",
"namespace":
"urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing",
"conformance-type": "implement"
},
{
"name": "ietf-ipv6-unicast-routing",
"revision": "2016-11-04",
"namespace":
"urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing",
"conformance-type": "implement"
},
{
"name": "ietf-interfaces",
"revision": "2014-05-08",
"namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces",
"conformance-type": "implement"
},
{
"name": "ietf-inet-types",
"namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types",
"revision": "2013-07-15",
"conformance-type": "import"
},
{
"name": "ietf-yang-types",
"namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types",
"revision": "2013-07-15",
"conformance-type": "import"
},
{
"name": "iana-if-type",
"namespace": "urn:ietf:params:xml:ns:yang:iana-if-type",
"revision": "",
"conformance-type": "implement"
},
{
"name": "ietf-ip",
"revision": "2014-06-16",
"namespace": "urn:ietf:params:xml:ns:yang:ietf-ip",
"conformance-type": "implement"
}
]
}
}
A simple network setup as shown in is assumed: 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
|
The instance data tree could then be as follows:
{
"ietf-interfaces:interfaces": {
"interface": [
{
"name": "eth0",
"type": "iana-if-type:ethernetCsmacd",
"description": "Uplink to ISP.",
"ietf-ip:ipv4": {
"address": [
{
"ip": "192.0.2.1",
"prefix-length": 24
}
],
"forwarding": true
},
"ietf-ip:ipv6": {
"address": [
{
"ip": "2001:0db8:0:1::1",
"prefix-length": 64
}
],
"forwarding": true,
"autoconf": {
"create-global-addresses": false
}
}
},
{
"name": "eth1",
"type": "iana-if-type:ethernetCsmacd",
"description": "Interface to the internal network.",
"ietf-ip:ipv4": {
"address": [
{
"ip": "198.51.100.1",
"prefix-length": 24
}
],
"forwarding": true
},
"ietf-ip:ipv6": {
"address": [
{
"ip": "2001:0db8:0:2::1",
"prefix-length": 64
}
],
"forwarding": true,
"autoconf": {
"create-global-addresses": false
},
"ietf-ipv6-unicast-routing:ipv6-router-advertisements": {
"send-advertisements": true
}
}
}
]
},
"ietf-interfaces:interfaces-state": {
"interface": [
{
"name": "eth0",
"type": "iana-if-type:ethernetCsmacd",
"phys-address": "00:0C:42:E5:B1:E9",
"oper-status": "up",
"statistics": {
"discontinuity-time": "2015-10-24T17:11:27+02:00"
},
"ietf-ip:ipv4": {
"forwarding": true,
"mtu": 1500,
"address": [
{
"ip": "192.0.2.1",
"prefix-length": 24
}
]
},
"ietf-ip:ipv6": {
"forwarding": true,
"mtu": 1500,
"address": [
{
"ip": "2001:0db8:0:1::1",
"prefix-length": 64
}
],
"ietf-ipv6-unicast-routing:ipv6-router-advertisements": {
"send-advertisements": false
}
}
},
{
"name": "eth1",
"type": "iana-if-type:ethernetCsmacd",
"phys-address": "00:0C:42:E5:B1:EA",
"oper-status": "up",
"statistics": {
"discontinuity-time": "2015-10-24T17:11:29+02:00"
},
"ietf-ip:ipv4": {
"forwarding": true,
"mtu": 1500,
"address": [
{
"ip": "198.51.100.1",
"prefix-length": 24
}
]
},
"ietf-ip:ipv6": {
"forwarding": true,
"mtu": 1500,
"address": [
{
"ip": "2001:0db8:0:2::1",
"prefix-length": 64
}
],
"ietf-ipv6-unicast-routing:ipv6-router-advertisements": {
"send-advertisements": true,
"prefix-list": {
"prefix": [
{
"prefix-spec": "2001:db8:0:2::/64"
}
]
}
}
}
}
]
},
"ietf-routing:routing": {
"router-id": "192.0.2.1",
"control-plane-protocols": {
"control-plane-protocol": [
{
"type": "ietf-routing:static",
"name": "st0",
"description":
"Static routing is used for the internal network.",
"static-routes": {
"ietf-ipv4-unicast-routing:ipv4": {
"route": [
{
"destination-prefix": "0.0.0.0/0",
"next-hop": {
"next-hop-address": "192.0.2.2"
}
}
]
},
"ietf-ipv6-unicast-routing:ipv6": {
"route": [
{
"destination-prefix": "::/0",
"next-hop": {
"next-hop-address": "2001:db8:0:1::2"
}
}
]
}
}
}
]
}
},
"ietf-routing:routing-state": {
"interfaces": {
"interface": [
"eth0",
"eth1"
]
},
"control-plane-protocols": {
"control-plane-protocol": [
{
"type": "ietf-routing:static",
"name": "st0"
}
]
},
"ribs": {
"rib": [
{
"name": "ipv4-master",
"address-family":
"ietf-ipv4-unicast-routing:ipv4-unicast",
"default-rib": true,
"routes": {
"route": [
{
"ietf-ipv4-unicast-routing:destination-prefix":
"192.0.2.1/24",
"next-hop": {
"outgoing-interface": "eth0"
},
"route-preference": 0,
"source-protocol": "ietf-routing:direct",
"last-updated": "2015-10-24T17:11:27+02:00"
},
{
"ietf-ipv4-unicast-routing:destination-prefix":
"198.51.100.0/24",
"next-hop": {
"outgoing-interface": "eth1"
},
"source-protocol": "ietf-routing:direct",
"route-preference": 0,
"last-updated": "2015-10-24T17:11:27+02:00"
},
{
"ietf-ipv4-unicast-routing:destination-prefix":
"0.0.0.0/0",
"source-protocol": "ietf-routing:static",
"route-preference": 5,
"next-hop": {
"ietf-ipv4-unicast-routing:next-hop-address":
"192.0.2.2"
},
"last-updated": "2015-10-24T18:02:45+02:00"
}
]
}
},
{
"name": "ipv6-master",
"address-family":
"ietf-ipv6-unicast-routing:ipv6-unicast",
"default-rib": true,
"routes": {
"route": [
{
"ietf-ipv6-unicast-routing:destination-prefix":
"2001:db8:0:1::/64",
"next-hop": {
"outgoing-interface": "eth0"
},
"source-protocol": "ietf-routing:direct",
"route-preference": 0,
"last-updated": "2015-10-24T17:11:27+02:00"
},
{
"ietf-ipv6-unicast-routing:destination-prefix":
"2001:db8:0:2::/64",
"next-hop": {
"outgoing-interface": "eth1"
},
"source-protocol": "ietf-routing:direct",
"route-preference": 0,
"last-updated": "2015-10-24T17:11:27+02:00"
},
{
"ietf-ipv6-unicast-routing:destination-prefix":
"::/0",
"next-hop": {
"ietf-ipv6-unicast-routing:next-hop-address":
"2001:db8:0:1::2"
},
"source-protocol": "ietf-routing:static",
"route-preference": 5,
"last-updated": "2015-10-24T18:02:45+02:00"
}
]
}
}
]
}
}
}
The authors wish to thank Nitin Bahadur, Martin Bjorklund,
Dean Bogdanovic, Jeff Haas, Joel Halpern, Wes Hardaker,
Sriganesh Kini, David Lamparter, Andrew McGregor, Jan Medved,
Xiang Li, Stephane Litkowski, Thomas Morin, Tom Petch,
Yingzhen Qu, Bruno Rijsman, Juergen Schoenwaelder, Phil Shafer,
Dave Thaler, Yi Yang, Derek Man&nbhy;Kit Yeung, and Jeffrey Zhang for
their helpful comments and suggestions.