draft-ietf-lsr-isis-extended-hierarchy-03.txt   draft-ietf-lsr-isis-extended-hierarchy-04.txt 
Internet Engineering Task Force T. Li Internet Engineering Task Force T. Li
Internet-Draft Arista Networks Internet-Draft Arista Networks
Intended status: Standards Track L. Ginsberg Intended status: Standards Track L. Ginsberg
Expires: July 7, 2021 P. Wells Expires: January 1, 2022 P. Wells
Cisco Systems Cisco Systems
January 3, 2021 June 30, 2021
IS-IS Extended Hierarchy IS-IS Extended Hierarchy
draft-ietf-lsr-isis-extended-hierarchy-03 draft-ietf-lsr-isis-extended-hierarchy-04
Abstract Abstract
The IS-IS routing protocol was originally defined with a two level The IS-IS routing protocol was originally defined with a two level
hierarchical structure. This was adequate for the networks at the hierarchical structure. This was adequate for the networks at the
time. As we continue to expand the scale of our networks, it is time. As we continue to expand the scale of our networks, it is
apparent that additional hierarchy would be a welcome degree of apparent that additional hierarchy would be a welcome degree of
flexibility in network design. flexibility in network design.
This document defines IS-IS Levels 3 through 8. This document defines IS-IS Levels 3 through 8.
skipping to change at page 1, line 38 skipping to change at page 1, line 38
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 7, 2021. This Internet-Draft will expire on January 1, 2022.
Copyright Notice Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
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publication of this document. Please review these documents publication of this document. Please review these documents
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