"This document describes an optional mechanism within Intermediate System to Intermediate Systems (IS-ISs) used today by many ISPs for IGP routing within their clouds. This document describes how to run@ within a single IS-IS domain@ a set of independent IP topologies that we call Multi-Topologies (MTs). This MT extension can be used for a variety of purposes@ such as an in-band management network ""on top"" of the original IGP topology@ maintaining separate IGP routing domains for isolated multicast or IPv6 islands within the backbone@ or forcing a subset of an address space to follow a different topology."
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