1. Segment Routing Path MTU in BGP
Publication: IETF Individual Draft
Publication History: 2018-07
Publication URL: https://tools.ietf.org/html/draft-li-idr-sr-policy-path-mtu-00
Description:
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.
2. IS-IS Extensions for Path MTU
Publication: IETF Individual Draft
Publication History: 2018-06
Publication URL: https://tools.ietf.org/html/draft-hu-lsr-isis-path-mtu-00
Description:
Segment routing (SR) leverages the source routing mechanism. It allows for a flexible definition of end-to-end paths with IGP topologies by encoding paths as sequences of topological sub-paths which is called segments. These segments are advertised by the link- state routing protocols (IS-IS and OSPF). Unlike the MPLS, SR does not have the specific path construction signaling so that it cannot support the Path MTU. This draft provides the necessary IS-IS extensions about the Path MTU that need to be used on SR.