IS-IS Support for Unidirectional Links

Document Type Replaced Internet-Draft (isis WG)
Authors Les Ginsberg  , Sina Mirtorabi  , Stefano Previdi  , Abhay Roy 
Last updated 2014-01-14 (latest revision 2013-07-13)
Replaced by draft-ietf-isis-udl
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-isis-udl
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This Internet-Draft is no longer active.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.)