Title: Domain-wide Prefix Distribution with Two-Level IS-IS
Author(s): T. Li, T. Przygienda, H. Smit.
Status: INFORMATIONAL
Date: Oct 2000
Length: 32465
This document describes extensions to the Intermediate System to Intermediate System (IS-IS) protocol to support optimal routing within a two-level domain. The IS-IS protocol is specified in ISO 10589, with extensions for supporting IPv4 (Internet Protocol) specified in RFC1195 [2].
This document extends the semantics presented in RFC1195 so that a routing domain running with both level 1 and level 2 Intermediate Systems (IS) [routers] can distribute IP prefixes between level 1 and level 2 and vice versa. This distribution requires certain restrictions to insure that persistent forwarding loops do not form. The goal of this domain-wide prefix distribution is to increase the granularity of the routing information within the domain.
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