L1/L2 Optimal IS-IS Routing

Document Type Expired Internet-Draft (isis WG)
Authors Tony Przygienda  , Ajay Patel 
Last updated 1999-02-19
Stream Internet Engineering Task Force (IETF)
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This Internet-Draft is no longer active.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 draft describes an optional extension within IS-IS [Cal90a, Cal90b, ISO90] for leaking level 2 IP prefixes into level 1. IS-IS is an interior gateway routing protocol developed originally by OSI and used with IP extensions as IGP. This draft describes how to allow for optimal routing in L1/L2 per destination prefix and to support BGP [RL95] MEDs derived from level 1 and level 2 IGP metric when using ISIS.


Tony Przygienda (prz@redback.com)
Ajay Patel (ajayp@dnrc.bell-labs.com)

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