A new Request for Comments is now available in online RFC libraries.
RFC 9491
Title: Integration of the Network Service
Header (NSH) and Segment Routing for
Service Function Chaining (SFC)
Author: J. Guichard, Ed.,
J. Tantsura, Ed.
Status: Standards Track
Stream: IETF
Date: November 2023
Mailbox: james.n.guich...@futurewei.com,
jefftant.i...@gmail.com
Pages: 17
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-spring-nsh-sr-15.txt
URL: https://www.rfc-editor.org/info/rfc9491
DOI: 10.17487/RFC9491
This document describes the integration of the Network Service Header
(NSH) and Segment Routing (SR), as well as encapsulation details, to
efficiently support Service Function Chaining (SFC) while maintaining
separation of the service and transport planes as originally intended
by the SFC architecture.
Combining these technologies allows SR to be used for steering
packets between Service Function Forwarders (SFFs) along a given
Service Function Path (SFP), whereas the NSH is responsible for
maintaining the integrity of the service plane, the SFC instance
context, and any associated metadata.
This integration demonstrates that the NSH and SR can work
cooperatively and provide a network operator with the flexibility to
use whichever transport technology makes sense in specific areas of
their network infrastructure while still maintaining an end-to-end
service plane using the NSH.
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
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