Compressed Routing Header (CRH) Helper Option
draft-bonica-6man-crh-helper-opt-00
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6man WG X. Li
Internet-Draft C. Bao
Intended status: Standards Track CERNET Center/Tsinghua University
Expires: May 3, 2020 E. Ruan
Fungible Inc.
R. Bonica
Juniper Networks
October 31, 2019
Compressed Routing Header (CRH) Helper Option
draft-bonica-6man-crh-helper-opt-00
Abstract
This document defines the IPv6 CRH Helper option. When an SRm6
ingress node originates a packet, it can use the IPv6 CRH Helper
option to provide SID Forwarding Information Base (SFIB) information
to downstream nodes that do not maintain a complete SFIB.
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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This Internet-Draft will expire on May 3, 2020.
Copyright Notice
Copyright (c) 2019 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 and restrictions with respect
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Li, et al. Expires May 3, 2020 [Page 1]
Internet-Draft CRH Helper Option October 2019
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Option Format . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Option Processing . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
SRm6 [I-D.bonica-spring-srv6-plus] leverages two new IPv6 [RFC8200]
Routing types. Generically, they are called the Compressed Routing
Header (CRH) [I-D.bonica-6man-comp-rtg-hdr]. More specifically, the
16-bit version of the CRH is called the CRH-16, while the 32-bit
version of the CRH is called the CRH-32.
Both CRH versions contain the following fields:
o Next Header - Identifies the header immediately following the CRH.
o Hdr Ext Len - Length of the CRH.
o Routing Type - Identifies the Routing header variant (i.e., CRH-16
or CRH-32).
o Segments Left - The number of segments still to be traversed
before reaching the SRm6 path egress node.
o Segment Identifier (SID) List - Represents the SRm6 path as an
ordered list of Segment Identifiers (SID). SIDs are listed in
reverse order, with SID[0] representing the final segment, SID[1]
representing the penultimate segment, and so forth. SIDs are
listed in reverse order so that Segments Left can be used as an
index to the SID List. The SID indexed by Segments Left is called
the current SID.
As per [RFC8200], when an IPv6 node receives a packet, it examines
the packet's destination address. If the destination address
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Internet-Draft CRH Helper Option October 2019
represents an interface belonging to the node, the node processes the
next header. If the node encounters and recognizes the CRH, it
processes the CRH as follows:
o If Segments Left equal 0, skip over the CRH and process the next
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