1st We identify the interfaces to enable for multicast. Here we will be doing our vlan1,2, & 3 on a ASA5505. The configuration looks like this;
2nd we must enable multicast routing globaly
And lastly, we check our configurations with a few show commands;
By default we are enabled for IGMPv2 and you can select version if so desired. The ASA does not support SSM or IGMPv3.
You can validate the mcast table via the show cmd "show mroute".
As with unicast traffic & policies, you will need acl entries to allow multicast traffic to pass.
access-list out2in extended permit ip any host 220.127.116.11
Key gotchas to be aware with multicast routing;
multicast boundaries filters
the appropiate fwpolicies and direction
rpf checks ( reverse path forward checks )
src-network/host must be in your route table
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