IS-IS Extensions To Support The IPv6 Compressed Routing Header (CRH)
draft-bonica-lsr-crh-isis-extensions-02
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LSR Working Group P. Kaneriya
Internet-Draft R. Shetty
Intended status: Standards Track S. Hegde
Expires: September 24, 2020 R. Bonica
Juniper Networks
March 23, 2020
IS-IS Extensions To Support The IPv6 Compressed Routing Header (CRH)
draft-bonica-lsr-crh-isis-extensions-02
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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 24, 2020.
Copyright Notice
Copyright (c) 2020 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
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Kaneriya, et al. Expires September 24, 2020 [Page 1]
Internet-Draft ISIS-CRH March 2020
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.
Kaneriya, et al. Expires September 24, 2020 [Page 2]
Internet-Draft ISIS-CRH March 2020
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:
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