Blocking Mroutes

By default, when an interface receives multicast traffic, even when the scope of that traffic exceeds link-local, the virtual router creates an mroute. You can use the ipv6 block-multicast-sources command to block all multicast traffic with a scope larger than link-local (for example, global) and prevent mroute creation under these conditions.

Note: Issuing this command does not affect reception of link-local multicast packets.

ipv6 block-multicast-sources

• Use to prevent mroute creation by blocking multicast traffic that has a scope larger than link-local (for example, global).
• Example

  host1(config)#ipv6 block-multicast-sources

• Use the no version to restore the default behavior of creating mroutes on receiving multicast packets.
• See ipv6 block-multicast-sources.

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