IS-IS Route Preference for Extended IP and IPv6 Reachability

Document Type Replaced Internet-Draft (individual)
Authors Les Ginsberg  , Stephane Litkowski  , Stefano Previdi 
Last updated 2015-01-03 (latest revision 2014-07-02)
Replaced by RFC 7775
Stream (None)
Intended RFC status (None)
Expired & archived
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Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-isis-route-preference
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Existing specifications as regards route preference are not explicit when applied to IP/IPv6 Extended Reachability TLVs. There are also inconsistencies in the definition of how the up/down bit applies to route preference when the prefix advertisement appears in Level 2 LSPs. This document addresses these issues.


Les Ginsberg (
Stephane Litkowski (
Stefano Previdi (

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