Chapter 8. Multitopology Routing in Intermediate System to Intermediate System (M-ISIS)

This chapter describes Multitopology Routing in IS-IS (M-ISIS), which extends the capabilities of the IS-IS routing protocol. These extensions have enabled M-ISIS to evolve into a general-purpose tool for providing multiple-topology support for technologies such as in-band management, multicast, and IPv6. As we did in Chapter 7 with MBGP, we focus on how M-ISIS can be used to create two separate virtual topologies, one for unicast and another for multicast.

In interdomain unicast routing, recursive routing is used to select the best path to a destination. When a BGP-learned route is selected as the best path to a destination, an IGP such as OSPF or IS-IS determines ...

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