When i activate multicast in my FWSM failover pair i get problems with clients not getting an IP address from the DHCP server. The clients have to pass the FWSM to reach the DHCP server.
A trunk of the config on the FWSM blade is below
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multicast-routing
interface Vlan10
nameif int10
security-level 10
ip address 172.16.10.254 255.255.255.0 standby 172.16.10.253
igmp access-group AllowedIGMPVlan10
ospf cost 10
interface Vlan80
nameif int80
security-level 80
ip address 172.16.80.254 255.255.255.0 standby 172.16.80.253
pim rp-address 172.16.80.254 AllowedMcastIPTVGroup
dhcprelay server 172.16.3.37 int3
dhcprelay enable int10