Multicast multi-topology in IS-IS uses a topology dedicated to route calculation for multicast services to guide multicast traffic forwarding.
Multicast multi-topology is IS-IS is applicable in the following situations: The multicast and unicast topologies need to use different routing policies to prevent them from affecting each other.
A TE tunnel exists in the unicast topology. The multicast service and TE tunnel service cannot be deployed together; therefore, multicast multi-topology is required to isolate the multicast service and TE tunnel service.
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