OSPFv3 Extensions for BIER
draft-ietf-bier-ospfv3-extensions-03
Network Work group P. Psenak, Ed.
Internet-Draft N. Nainar, Ed.
Intended status: Standards Track Cisco Systems, Inc.
Expires: May 24, 2021 IJ. Wijnands
Individual Contributor
November 20, 2020
OSPFv3 Extensions for BIER
draft-ietf-bier-ospfv3-extensions-03
Abstract
Bit Index Explicit Replication (BIER) is an architecture that
provides multicast forwarding through a "BIER domain" without
requiring intermediate routers to maintain multicast related per-flow
state. Neither does BIER require an explicit tree-building protocol
for its operation. A multicast data packet enters a BIER domain at a
"Bit-Forwarding Ingress Router" (BFIR), and leaves the BIER domain at
one or more "Bit-Forwarding Egress Routers" (BFERs). The BFIR router
adds a BIER header to the packet. Such header contains a bit-string
in which each bit represents exactly one BFER to forward the packet
to. The set of BFERs to which the multicast packet needs to be
forwarded is expressed by the according set of bits set in BIER
packet header.
This document describes the OSPFv3 [RFC8362] protocol extensions
required for BIER with MPLS encapsulation [RFC8296]. Support for
other encapsulation types is outside the scope of this document. The
use of multiple encapsulation types is outside the scope of this
document.
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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 24, 2021.
Psenak, et al. Expires May 24, 2021 [Page 1]
Internet-Draft OSPFv3 Extensions for BIER November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Flooding of the BIER Information in OSPFv3 . . . . . . . . . 3
2.1. BIER Sub-TLV . . . . . . . . . . . . . . . . . . . . . . 3
2.2. BIER MPLS Encapsulation Sub-TLV . . . . . . . . . . . . . 5
2.3. Flooding scope of BIER Information . . . . . . . . . . . 6
3. Security Considerations . . . . . . . . . . . . . . . . . . . 7
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
6. Normative References . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Bit Index Explicit Replication (BIER) is an architecture that
provides optimal multicast forwarding through a "BIER domain" without
requiring intermediate routers to maintain any multicast related per-
flow state. Neither does BIER explicitly require a tree-building
protocol for its operation. A multicast data packet enters a BIER
domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the
BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs).
The BFIR router adds a BIER header to the packet. The BIER header
contains a bit-string in which each bit represents exactly one BFER
to forward the packet to. The set of BFERs to which the multicast
packet needs to be forwarded is expressed by setting the bits that
correspond to those routers in the BIER header.
BIER architecture requires routers participating in BIER to exchange
BIER related information within a given domain. BIER architecture
permits link-state routing protocols to perform distribution of such
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