IGP Extensions for Advertising Node IndexIndependentBoston, MAUSAhchen.ietf@gmail.comIndependent2386 Panoramic CircleApopka, FL32703USA+1-508-333-2270d3e3e3@gmail.comChina TelecomBeiqijia Town, Changping DistrictBeijing102209Chinawangaj3@chinatelecom.cnVerizon Inc.13101 Columbia PikeSilver SpringMD 20904USA 301 502-1347gyan.s.mishra@verizon.comChina Mobileliuyisong@chinamobile.comCasa SystemsUSAyfan@casa-systems.comFujitsuUSAliulei.kddi@gmail.comAlef EdgeUSAxufeng.liu.ietf@gmail.comThis document describes OSPF and IS-IS extensions for
distributing the node index
configured on a node.
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
when, and only when, they appear in all capitals, as shown here.When the nodes in a network
are numbered or indexed
from 1 to the number of the nodes,
an efficient stateless multicast along the shortest paths to the egresses
of a P2MP tree can be achieved using the node indices of the egresses.This document proposes OSPF and IS-IS extensions for distributing the
node index configured on a node
to support the best effort stateless multicast.
When a controller such as PCE as a controller
has the node indexes,
it can send the P2MP tree encoded in the node indexes to
the ingress of the tree.Link State Advertisement.Open Shortest Path First.Link State Protocol data unit.Intermediate System to Intermediate System.This section describes extensions to OSPF
for distributing the node index configured on a node.
The node index of a node MUST be unique in a network.
This is like the identifier (ID) of the node. defines the
Router Information (RI) Link state Advertisement (LSA).
The RI LSA is used to advertise Optional Router Information
using Router Information LSA TLVs.
A new Router Information LSA TLV, called Node Index TLV,
is defined to carry the Node Index configured on the node originating
the RI LSA.
The Node Index TLV has the following format:
TBD1.2.The node index configured on a node.This TLV is optional. It is applicable to both OSPFv2 and OSPFv3.
For advertising a node index, the area-scoped RI LSA including
a Node Index TLV is used.This section describes an extension to IS-IS
for distributing the Node Index configured on a node. defines the IS-IS Router
CAPABILITY TLV to advertise Router Information.
The TLV includes multiple sub-TLVs.
A new Node Index sub-TLV to be included in the TLV,
is defined to carry the Node Index configured on the node originating
the TLV in its LSP.
This sub-TLV has the following format:
TBD2.2.The Node Index configured on a node.This sub-TLV is optional.
For advertising a node index, the area-scoped LSP including
a Node Index sub-TLV in an IS-IS Router CAPABILITY TLV is used.TBD.Under "OSPF Router Information (RI) TLVs registry" as defined
in , IANA is
requested to assign a new type as follows:
+==============+===================+=====================+
| Value | Description | reference |
+==============+===================+=====================+
| TBD1 | Node Index | This document |
+--------------+-------------------+---------------------+
Under "Sub-TLVs for TLV 242 (IS-IS
Router CAPABILITY TLV) registry" as defined
in , IANA is
requested to assign a new sub-TLV as follows:
+==============+===================+=====================+
| Value | Description | reference |
+==============+===================+=====================+
| TBD2 | Node Index | This document |
+--------------+-------------------+---------------------+
The authors would like to thank people
for their comments on this work.