Multicast stops flowing after 4 mins

[branfarm1]

Hello,

I'm having an issue with multicast that I can't seem to solve.   I have a provider that is sending me a number of multicast groups in dense mode.  Their interface is configured dense mode.  I have their router connected to an access port on my 6509E, with the IP info configured on an SVI. My interface is also configured in dense mode.  When I first bring up the interface,   data flows fine for exactly 4 mins, but then stops.  I can only get the data to flow again if I either add an igmp join-group statement on the interface, or if I do a shut/no shut on the interface.

I've also tried adding the igmp static-group statement, instead of the join-group, but that doesn't work either.

I have other data providers that are sending me other groups, and all of those seem to work fine -- it's just this one connection giving me fits.

Can anyone offer any suggestions on where to look next?

Thanks,

Brandon

[Giuseppe Larosa]

Hello Brandon,

what is the output of

show ip mroute G

on your device after 4 minutes?

it looks like that your device is not aware of any interested receiver on the group G

verify if your device is sending a PIM prune to the upstream device for group G

adding an igmp join-group makes your network device a receiver for group G.

shut/no shut restarts also the PIM neighborship I guess

Hope to help

Giuseppe