Hierarchical IS-IS

Document Type Replaced Internet-Draft (individual)
Authors Tony Li  , Les Ginsberg  , Paul Wells 
Last updated 2019-06-05
Replaces draft-li-hierarchical-isis
Replaced by draft-ietf-lsr-isis-extended-hierarchy
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Intended RFC status (None)
Expired & archived
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The IS-IS routing protocol was originally defined with a two level hierarchical structure. This was adequate for the networks at the time. As we continue to expand the scale of our networks, it is apparent that additional hierarchy would be a welcome degree of flexibility in network design. This document defines IS-IS Levels 3 through 8.


Tony Li (tony.li@tony.li)
Les Ginsberg (ginsberg@cisco.com)
Paul Wells (pauwells@cisco.com)

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