IP Multicast in a Site-to-Site VPN
Following is the basic multicast configuration for VPN-HE-2.
ip multicast-routing ! interface Tunnel0
description Primary Tunnel to Branch2 ip pim sparse-mode ! interface Tunnel1
description Secondary Tunnel to Branch1 ip pim sparse-mode ! interface FastEthernet0/0
description to Corporate Network ip pim sparse-mode ! ip pim rp-address 10.6.2.1
Loopback 1 address of both RPs.
Ensure that the IP subnets for the GRE tunnels are advertised in the IGP routing protocol. If not, RPF failures will occur.
In summary, when using IP multicast with MoH or IP/TV in the WAN follow these recommendations. Use PIM-SM (recommended) Anycast RP (recommended) – Fast convergence, redundancy, load balancing
Cisco AVVID Network Infrastructure IP Multicast Design