IS-IS Extensions To Support The IPv6 Compressed Routing Header (CRH)
draft-bonica-lsr-crh-isis-extensions-03
LSR Working Group P. Kaneriya
Internet-Draft R. Shetty
Intended status: Standards Track S. Hegde
Expires: March 3, 2021 R. Bonica
Juniper Networks
August 30, 2020
IS-IS Extensions To Support The IPv6 Compressed Routing Header (CRH)
draft-bonica-lsr-crh-isis-extensions-03
Abstract
Source nodes can use the IPv6 Compressed Routing Header (CRH) to
steer packets through a specified path. This document defines IS-IS
extensions that support the CRH.
Status of This Memo
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This Internet-Draft will expire on March 3, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. Advertising The CRH Capability . . . . . . . . . . . . . . . 2
4. Advertising Prefix Segment Identifiers . . . . . . . . . . . 3
5. Advertising Adjacency Segment Identifiers . . . . . . . . . . 4
6. Advertising Adjacency Segment Identifiers Into LANs . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7.1. The CRH Sub-TLV . . . . . . . . . . . . . . . . . . . . . 7
7.2. Prefix SID Sub-TLV . . . . . . . . . . . . . . . . . . . 8
7.3. Adjacency SID Sub-TLV . . . . . . . . . . . . . . . . . . 8
8. Security Considerations . . . . . . . . . . . . . . . . . . . 9
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
10.1. Normative References . . . . . . . . . . . . . . . . . . 9
10.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Source nodes can use the IPv6 Compressed Routing Header (CRH)
[I-D.bonica-6man-comp-rtg-hdr] to steer packets through a specified
path. This document defines IS-IS extensions that support the CRH.
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Advertising The CRH Capability
The Router CAPABILITY TLV [RFC7981] MAY contain exactly one CRH sub-
TLV. The CRH sub-TLV indicates that the advertising node can process
the CRH.
The CRH sub-TLV MAY contain sub-sub-TLVs. No sub-sub-TLVs are
currently defined.
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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 | Length | Max CRH Len | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: CRH Sub-TLV
Figure 1 depicts the CRH sub-TLV. The CRH sub-TLV contains the
following fields:
o Type: 8 bits. CRH (value TBD by IANA. Suggested value is 30.)
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