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Multicast over different subnets

I have a need to do multicast over different subnets and across several LAN routers. I can see all interfaces and vlans associated to the group that are connected directly to the local router,but can't get the remote routers to join. I think I should be using ip mroute but not sure.We are doing this on 3750 switches running eigrp.

Any ideas welcome

Thanks Chris

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Re: Multicast over different subnets

Router(config)# interface virtual-interface

Defines a virtual interface for multicast fast switching. Routers joining the same session must have their virtual interfaces on different subnets. Otherwise packets are not switched to the IP network.

Router(config-if)# ip address address subnet-mask

Assigns the IP address and subnet mask for the virtual interface.

Router(config-if)# ip pim { sparse mode | dense-mode | sparse-dense-mode }

Specifies Protocol Independent Multicast (PIM). Whatever mode you choose should match all the interfaces in all the routers of your network.

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