[c-nsp] Multicast Issue

[John Neiberger]

I've got an interesting issue that I think I'm tantalizingly close to
solving but I haven't had to deal with multicast stuff in years.

We have a PC on one subnet that is sourcing a multicast packet. I need
to get that packet to a device on another LAN that is not capable of
sending IGMP joins. Here's the topology:

PC *- 6513(IOS) *- 2950 *- Server

In this case, the PC is sending out a single multicast packet trying to
reach the server. The packet does not reach the server because it can't
join the group. The multicast group is 224.0.1.55. The "server" is in
Vlan1, so on the 6513 I have the following configured:

int Vlan1
 ...
 ip igmp static-group 224.0.1.55
!
! That makes Vlan1 show up in the mroute table, but I still need to
forward that packet out some particular interface, right? So...
!
mac-address-table static 0100.5e00.0137 vlan 1 interface
GigabitEthernet4/16
!
!  That statically forwards traffic destined for that multicast address
out the interface leading to the Catalyst 2950

On the 2950 I have the following:

mac-address-table static 0100.5e00.0137 vlan 1 interface
GigabitEthernet0/2 

That should forward the multicast traffic to the server hanging of off
g0/2. However, this isn't working. I've tinkered with a couple of
different configs but nothing seems to work. Debugging shows that the
multicast packet is making it to the 6513.

1y19w: IP: s=10.a.b.c (Vlan4) d=224.0.1.55 (Vlan1) len 92, mforward

The output of "show ip mroute 224.0.1.55" shows the following:

(*, 224.0.1.55), 00:00:01/00:02:58, RP 0.0.0.0, flags: DC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan1, Forward/Dense, 00:00:01/00:00:00

It looks to me like the 6513 should know where to forward the packets
but it isn't working. 

Any ideas?

Thanks!
John
--