BIER-TE Egress Protection
draft-chen-bier-te-egress-protect-00
Network Working Group H. Chen
Internet-Draft M. McBride
Intended status: Standards Track Futurewei
Expires: August 25, 2021 A. Wang
China Telecom
G. Mishra
Verizon Inc.
Y. Liu
China Mobile
Y. Fan
Casa Systems
L. Liu
Fujitsu
X. Liu
Volta Networks
February 21, 2021
BIER-TE Egress Protection
draft-chen-bier-te-egress-protect-00
Abstract
This document describes a mechanism for fast protection against the
failure of an egress node of an explicit point to multipoint (P2MP)
multicast path/tree in a "Bit Index Explicit Replication" (BIER)
Traffic Engineering (TE) domain. It does not have any per-flow state
in the core of the domain. For a multicast packet to the egress
node, when the egress node fails, its upstream hop as a PLR sends the
packet to the egress' backup node once the PLR detects the failure.
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
Task Force (IETF). Note that other groups may also distribute
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Chen, et al. Expires August 25, 2021 [Page 1]
Internet-Draft BIER-TE Egress Protect February 2021
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This Internet-Draft will expire on August 25, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Overview of BIER-TE Egress Protection . . . . . . . . . . . . 4
3. Protocol Extensions . . . . . . . . . . . . . . . . . . . . . 5
3.1. Extensions to OSPF . . . . . . . . . . . . . . . . . . . 5
3.2. Extensions to IS-IS . . . . . . . . . . . . . . . . . . . 6
4. BIER-TE Extensions . . . . . . . . . . . . . . . . . . . . . 7
4.1. Extensions to BIER-TE BIFT for Egress Protection . . . . 7
4.2. Updated Forwarding Procedure . . . . . . . . . . . . . . 7
5. Example Application of BIER-TE Egress Protection . . . . . . 9
5.1. Example BIER-TE Topology . . . . . . . . . . . . . . . . 9
5.2. BIER-TE BIFT on a BFR . . . . . . . . . . . . . . . . . . 10
5.3. Extended BIER-TE BIFT on a BFR . . . . . . . . . . . . . 11
5.4. Forwarding using Extended BIER-TE BIFT . . . . . . . . . 12
6. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
9.1. Normative References . . . . . . . . . . . . . . . . . . 14
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