Segment Routing Path MTU in BGP

Document Type Replaced Internet-Draft (idr WG)
Authors Cheng Li  , Yongqing Zhu  , Ahmed El Sawaf  , Zhenbin Li 
Last updated 2020-04-27 (latest revision 2019-11-03)
Replaced by draft-ietf-idr-sr-policy-path-mtu
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-idr-sr-policy-path-mtu
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Segment Routing is a source routing paradigm that explicitly indicates the forwarding path for packets at the ingress node. An SR policy is a set of candidate SR paths consisting of one or more segment lists with necessary path attributes. However, the path maximum transmission unit (MTU) information for SR path is not available in the SR policy since the SR does not require signaling. This document defines extensions to BGP to distribute path MTU information within SR policies.


Cheng Li (
Yongqing Zhu (
Ahmed El Sawaf (
Zhenbin Li (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)