Internet DRAFT - draft-chen-lsr-adv-ni
draft-chen-lsr-adv-ni
Network Working Group H. Chen
Internet-Draft D. Eastlake
Intended status: Standards Track Futurewei
Expires: 13 July 2024 A. Wang
China Telecom
G. Mishra
Verizon Inc.
Y. Liu
China Mobile
Y. Fan
Casa Systems
L. Liu
Fujitsu
X. Liu
Alef Edge
10 January 2024
IGP Extensions for Advertising Node Index
draft-chen-lsr-adv-ni-03
Abstract
This document describes OSPF and IS-IS extensions for distributing
the node index configured on a node.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119] [RFC8174]
when, and only when, they appear in all capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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Internet-Drafts are draft documents valid for a maximum of six months
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Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Extensions to OSPF . . . . . . . . . . . . . . . . . . . . . 3
3. Extension to IS-IS . . . . . . . . . . . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
5.1. OSPF RI TLVs Registry . . . . . . . . . . . . . . . . . . 4
5.2. IS-IS Sub-TLVs for TLV 242 Registry . . . . . . . . . . . 4
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
7.1. Normative References . . . . . . . . . . . . . . . . . . 5
7.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
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.
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1.1. Terminology
LSA: Link State Advertisement.
OSPF: Open Shortest Path First.
LSP: Link State Protocol data unit.
IS-IS: Intermediate System to Intermediate System.
2. Extensions to OSPF
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.
[RFC7770] 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:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (TBD1) | Length (2) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Node Index |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Node Index TLV
Type: TBD1.
Length: 2.
Node Index: 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.
3. Extension to IS-IS
This section describes an extension to IS-IS for distributing the
Node Index configured on a node.
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[RFC7981] 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:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type (TBD2) | Length (2) | Node Index |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Node Index sub-TLV
Type: TBD2.
Length: 2.
Node Index: 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.
4. Security Considerations
TBD.
5. IANA Considerations
5.1. OSPF RI TLVs Registry
Under "OSPF Router Information (RI) TLVs registry" as defined in
[RFC7770], IANA is requested to assign a new type as follows:
+==============+===================+=====================+
| Value | Description | reference |
+==============+===================+=====================+
| TBD1 | Node Index | This document |
+--------------+-------------------+---------------------+
5.2. IS-IS Sub-TLVs for TLV 242 Registry
Under "Sub-TLVs for TLV 242 (IS-IS Router CAPABILITY TLV) registry"
as defined in [RFC7981], IANA is requested to assign a new sub-TLV as
follows:
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+==============+===================+=====================+
| Value | Description | reference |
+==============+===================+=====================+
| TBD2 | Node Index | This document |
+--------------+-------------------+---------------------+
6. Acknowledgements
The authors would like to thank people for their comments on this
work.
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", RFC 5226,
DOI 10.17487/RFC5226, May 2008,
<https://www.rfc-editor.org/info/rfc5226>.
[RFC7770] Lindem, A., Ed., Shen, N., Vasseur, JP., Aggarwal, R., and
S. Shaffer, "Extensions to OSPF for Advertising Optional
Router Capabilities", RFC 7770, DOI 10.17487/RFC7770,
February 2016, <https://www.rfc-editor.org/info/rfc7770>.
[RFC7981] Ginsberg, L., Previdi, S., and M. Chen, "IS-IS Extensions
for Advertising Router Information", RFC 7981,
DOI 10.17487/RFC7981, October 2016,
<https://www.rfc-editor.org/info/rfc7981>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
7.2. Informative References
[RFC5250] Berger, L., Bryskin, I., Zinin, A., and R. Coltun, "The
OSPF Opaque LSA Option", RFC 5250, DOI 10.17487/RFC5250,
July 2008, <https://www.rfc-editor.org/info/rfc5250>.
Authors' Addresses
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Huaimo Chen
Futurewei
Boston, MA,
United States of America
Email: Huaimo.chen@futurewei.com
Donald E. Eastlake 3rd
Futurewei
2386 Panoramic Circle
Apopka, FL, 32703
United States of America
Phone: +1-508-333-2270
Email: d3e3e3@gmail.com
Aijun Wang
China Telecom
Beiqijia Town, Changping District
Beijing
102209
China
Email: wangaj3@chinatelecom.cn
Gyan S. Mishra
Verizon Inc.
13101 Columbia Pike
Silver Spring, MD 20904
United States of America
Phone: 301 502-1347
Email: gyan.s.mishra@verizon.com
Yisong Liu
China Mobile
Email: liuyisong@chinamobile.com
Yanhe Fan
Casa Systems
United States of America
Email: yfan@casa-systems.com
Lei Liu
Fujitsu
United States of America
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Email: liulei.kddi@gmail.com
Xufeng Liu
Alef Edge
United States of America
Email: xufeng.liu.ietf@gmail.com
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