A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IS-IS Extended Hierarchy
        Authors         : Tony Li
                          Les Ginsberg
                          Paul Wells
        Filename        : draft-ietf-lsr-isis-extended-hierarchy-02.txt
        Pages           : 19
        Date            : 2020-07-05

   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.

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