Multicast around a multi-context FWSM

Unanswered Question
Aug 19th, 2009
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FWSM multi-context doesn't do multicast. So I'm attempting to doit the same way as you'd configure non-ip protocols like decnet.

I have put a vlan interface into the vlan, but with an unnumbered ip address


interface vlan123

ip unnumbered loopback 0

and the normal IP route TO vlan123 is via the FWSM (In the same chassis).

Multicast is working fine from the core networks TO the vlan, I can see packets arriving at the hosts. But packets TO the group address FROM hosts on vlan123 get dropped at the router, with 'not RPF interface'.

Now I should eb able to override that with a static mroute... But I can't get a static mroute to behave as an INTERFACE route. It always wants a REMOTE IP address to uise as the neighbour.

Is there a better way? (I was thinking of using a VRF and tunnelling, but I'd like to keep the config as simple as possible).



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