Multicast PIM Dense Problem

[chrisayres]

Hi,

I know Pim Dense should be the easiest thing to do but I am having a problem.

My network is like this  3925 ring connected by G703 E1 and GigE ints

2911 spurs connected to the ring also G703

ip multicast-routing enabled on every router

ip pim dense-mode on every interface

that is all the multicast config there is

routing is multi-area OSPF  (ring = area 0)

I have a multicast source at the end of one of the spurs sending various groups.

I can see the multicast traffic get along the spur (4 routers) Ok

but the 3900 in the ring has no mroutes for the groups.

The 3900 interface that connects to the spur is seeing alot of incoming packets that stop when the source stops sending

ip mroute on the last spur router before the ring is

(10.250.140.217, 226.0.0.1), 00:23:53/00:02:37, flags: T
  Incoming interface: Serial0/1/0:0, RPF nbr 10.250.141.209
  Outgoing interface list:
    Serial0/2/1:0, Forward/Dense, 00:02:08/stopped
    Serial0/2/0:0, Forward/Dense, 00:19:14/stopped

but all other router before this one on the spur have

(10.250.140.217, 226.0.0.1), 00:23:53/00:02:37, flags: T

  Incoming interface: Serial0/1/0:0, RPF nbr 10.250.141.209

  Outgoing interface list:

    Serial0/2/1:0, Forward/Dense, 00:02:08/00:00:00

    Serial0/2/0:0, Forward/Dense, 00:19:14/00:00:00.

any ideas why the 3900 is not seeing the multicast traffic

and what does the stopped mean

                    Serial0/2/0:0, Forward/Dense, 00:19:14/stopped

regards

Chris Ayres

[Peter Paluch]

Chris,

A couple of questions.

1. Would it be possible to display the configuration of the last spur router before the ring, or at least post the multicast-related configuration including the configuration of the interfaces? By the way, are you using any ISDN/T/E line here?
2. What IGMP version is being used by your multicast receivers? Are there any IGMP states created on the last spur router? See the show ip igmp groups output
3. Would it be possible to post a schematic picture of the topology of your network? What I find curious is that several your routers, according to your own post, indicate the same RPF neighbor 10.250.141.209 towards the sender. That would mean that several routers are interconnected by some sort of multiaccess cloud, as they can all reach the 10.250.141.209 directly. What is the nature of this interconnection - is it a NBMA type network?

Best regards,

Peter