Inbound Multicast Configuration
Because the hosts that need to receive the multicast traffic are separated from the multicast
router by your Security Appliance, you need to configure the Security Appliance to forward
IGMP reports from the hosts protected by the firewall to the multicast router. You also need
to forward multicast transmissions from the multicast router. The following configuration
steps enable this multicast configuration:
Step 1 Use the multicast routing command to enable multicast processing on a
specific interface and place the interface in multicast promiscuous
mode. This also places the command line in multicast subcommand
mode, designated by the (config-multicast)# prompt.
Step 2 Use the igmp forward command to enable IGMP forwarding on the
interfaces connected to hosts that will receive multicast transmissions.
This also enables the interface to forward all IGMP Host Report and
Leave messages.
Step 3 (Optional) If your network contains clients that cannot respond to
IGMP messages but still require the reception of multicast traffic, you
use the igmp join-group command to statically join the Security
Appliance to the specific multicast group.