CCIE Practical Studies, Volume II (CCIE Self-Study)

CCIE Practical Studies, Volume II

By Karl Solie and Leah Lynch

Multicast Boundary

As a more stringent control, if multicast traffic is not desired to cross an imaginary line in a router, you can set up a multicast boundary. You can restrict this to certain multicast groups through a standard IP access list.

The ip multicast boundary (acl#) interface command enables you to create multicast boundaries. Multicast boundaries are bidirectional in nature. You can also add a parameter of filter-autorp to the command to filter multicast range announcements within the auto-RP messages. Auto-RP is discussed next.

Router(config-if)# ip multicast boundary 1
Router(config)# access-list 1 deny 239.0.0.0 0.255.255.255
Router(config)# access-list 1 permit 224.0.0.0 15.255.255.255

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