[spring] RFC 9545 on Path Segment Identifier in MPLS-Based Segment Routing Networks
rfc-editor@rfc-editor.org Thu, 22 February 2024 22:06 UTC
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Subject: [spring] RFC 9545 on Path Segment Identifier in MPLS-Based Segment Routing Networks
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A new Request for Comments is now available in online RFC libraries.
RFC 9545
Title: Path Segment Identifier in MPLS-Based
Segment Routing Networks
Author: W. Cheng, Ed.,
H. Li,
C. Li, Ed.,
R. Gandhi,
R. Zigler
Status: Standards Track
Stream: IETF
Date: February 2024
Mailbox: chengweiqiang@chinamobile.com,
lihan@chinamobile.com,
c.l@huawei.com,
rgandhi@cisco.com,
royi.zigler@broadcom.com
Pages: 11
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-spring-mpls-path-segment-22.txt
URL: https://www.rfc-editor.org/info/rfc9545
DOI: 10.17487/RFC9545
A Segment Routing (SR) path is identified by an SR segment list. A
subset of segments from the segment list cannot be leveraged to
distinguish one SR path from another as they may be partially
congruent. SR path identification is a prerequisite for various use
cases such as performance measurement and end-to-end 1+1 path
protection.
In an SR over MPLS (SR-MPLS) data plane, an egress node cannot
determine on which SR path a packet traversed the network from the
label stack because the segment identifiers are removed from the
label stack as the packet transits the network.
This document defines a Path Segment Identifier (PSID) to identify an
SR path on the egress node of the path.
This document is a product of the Source Packet Routing in Networking Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
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