I am facing a well known issue is that when a LAN firewall points to the HSRP standby IP to reach the MCAST source and RP addresses, the IGMP Join Messages from the LAN users are not reaching the gateway routers configured with sparse mode on the LAN interfaces. *,G entries are also not forming when the F/W points to the HSRP IP address of the G/W routers. The reason is well known as the PIM neighbor messages are never sourced from a HSRP standby IP. SO when I point the frewall to the real ip of any of the routers *,G & S,G are all forming fine and the MCAST tree is building up.
Is there any workaround to this if i have to use both the gateway routers for MCAST traffic from a resiliency perspective..