IS-IS Support for Unidirectional Links

Document Type Expired Internet-Draft (isis WG)
Authors Les Ginsberg  , Sina Mirtorabi  , Stefano Previdi  , Abhay Roy 
Last updated 2014-12-30 (latest revision 2014-06-28)
Replaces draft-ginsberg-isis-udl
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines support for the operation of IS-IS over Unidirectional Links without the use of tunnels or encapsulation of IS-IS Protocol Data Units. Adjacency establishment when the return path from the router at the receive end of a unidirectional link to the router at the transmit end of the unidirectional link is via another unidirectional link is supported. The extensions defined here are backwards compatible - only the routers directly connected to a unidirectional link need to be upgraded.


Les Ginsberg (
Sina Mirtorabi (
Stefano Previdi (
Abhay Roy (

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