RFC 9262

Tree Engineering for Bit Index Explicit Replication (BIER-TE), October 2022

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Status:
PROPOSED STANDARD
Authors:
T. Eckert, Ed.
M. Menth
G. Cauchie
Stream:
IETF
Source:
bier (rtg)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC9262

Discuss this RFC: Send questions or comments to bier@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF  |  View History of RFC 9262


Abstract

This memo describes per-packet stateless strict and loose path steered replication and forwarding for "Bit Index Explicit Replication" (BIER) packets (RFC 8279); it is called "Tree Engineering for Bit Index Explicit Replication" (BIER-TE) and is intended to be used as the path steering mechanism for Traffic Engineering with BIER.

BIER-TE introduces a new semantic for "bit positions" (BPs). These BPs indicate adjacencies of the network topology, as opposed to (non-TE) BIER in which BPs indicate "Bit-Forwarding Egress Routers" (BFERs). A BIER-TE "packets BitString" therefore indicates the edges of the (loop-free) tree across which the packets are forwarded by BIER-TE. BIER-TE can leverage BIER forwarding engines with little changes. Co-existence of BIER and BIER-TE forwarding in the same domain is possible -- for example, by using separate BIER "subdomains" (SDs). Except for the optional routed adjacencies, BIER-TE does not require a BIER routing underlay and can therefore operate without depending on a routing protocol such as the "Interior Gateway Protocol" (IGP).


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.




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