rfc9857v3.txt   rfc9857.txt 
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Internet Engineering Task Force (IETF) S. Previdi Internet Engineering Task Force (IETF) S. Previdi
Request for Comments: 9857 Individual Request for Comments: 9857 Individual
Category: Standards Track K. Talaulikar, Ed. Category: Standards Track K. Talaulikar, Ed.
ISSN: 2070-1721 Cisco Systems ISSN: 2070-1721 Cisco Systems
J. Dong J. Dong
Huawei Technologies Huawei Technologies
H. Gredler H. Gredler
RtBrick Inc. RtBrick Inc.
J. Tantsura J. Tantsura
Nvidia Nvidia
September 2025 October 2025
Advertisement of Segment Routing Policies Using BGP - Link State Advertisement of Segment Routing Policies Using BGP - Link State
Abstract Abstract
This document describes a mechanism used to collect Segment Routing This document describes a mechanism used to collect Segment Routing
(SR) Policy information that is locally available in a node and (SR) Policy information that is locally available in a node and
advertise it into BGP - Link State (BGP-LS) updates. Such advertise it into BGP - Link State (BGP-LS) updates. Such
information can be used by external components for path computation, information can be used by external components for path computation,
reoptimization, service placement, network visualization, etc. reoptimization, service placement, network visualization, etc.
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