IS-IS Extensions for Path MTU

Document Type Expired Internet-Draft (individual)
Authors Zhibo Hu , Yongqing Zhu  , Zhenbin Li  , Longfei Dai 
Last updated 2019-01-01 (latest revision 2018-06-30)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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.


Zhibo Hu (
Yongqing Zhu (
Zhenbin Li (
Longfei Dai (

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