Domain-wide Prefix Distribution with Two-Level IS-IS
T. Li, Tony Przygienda, Henk Smit · 2000
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 RFC 1195 [2].