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RFC 9377
Title: IS-IS Flood Reflection
Author: T. Przygienda, Ed.,
C. Bowers,
Y. Lee,
A. Sharma,
R. White
Status: Experimental
Stream: IETF
Date: April 2023
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 19
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-lsr-isis-flood-reflection-12.txt
URL: https://www.rfc-editor.org/info/rfc9377
DOI: 10.17487/RFC9377
This document describes a backward-compatible, optional IS-IS
extension that allows the creation of IS-IS flood reflection
topologies. Flood reflection permits topologies in which IS-IS Level
1 (L1) areas provide transit-forwarding for IS-IS Level 2 (L2) areas
using all available L1 nodes internally. It accomplishes this by
creating L2 flood reflection adjacencies within each L1 area. Those
adjacencies are used to flood L2 Link State Protocol Data Units
(LSPs) and are used in the L2 Shortest Path First (SPF) computation.
However, they are not ordinarily utilized for forwarding within the
flood reflection cluster. This arrangement gives the L2 topology
significantly better scaling properties than prevalently used flat
designs. As an additional benefit, only those routers directly
participating in flood reflection are required to support the
feature. This allows for incremental deployment of scalable L1
transit areas in an existing, previously flat network design, without
the necessity of upgrading all routers in the network.
This document is a product of the Link State Routing Working Group of the IETF.
EXPERIMENTAL: This memo defines an Experimental Protocol for the
Internet community. It does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
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