Hi,
I am attempting to troubleshoot a multicast problem and I'm at a dead end. I have a host that needs to join a particular group, but when the host joins, no data ever flows. On the router (6506 w/Sup 720), I see a *,G entry, but no S,G. I've also put a sniffer on the line between my router and the upstream router and I see PIM messages being exchanged, but I don't see any PIM register messages at the time I first join the group. I've included my config items below, as well as a number of show commands:
interface Vlan2668
ip address 142.201.179.14 255.255.255.252
ip pim sparse-mode
load-interval 30
ip pim rp-address 142.201.52.45 36
Standard IP access list 36
10 permit 233.102.209.0, wildcard bits 0.0.0.255 (33383 matches)
Group: 233.102.209.129, RP: 142.201.52.45, v2, uptime 00:32:09, expires never
Group: 233.102.209.130, RP: 142.201.52.45, v2, uptime 00:00:13, expires never
Group: 233.102.209.131, RP: 142.201.52.45, v2, uptime 05:48:26, expires never
Group: 233.102.209.131, RP: 142.201.52.45, v2, uptime 05:48:28, expires never
ip route 142.201.52.45 255.255.255.255 142.201.179.13
ip mroute 142.201.219.0 255.255.255.0 142.201.179.13
sh ip mroute 233.102.209.129
(*, 233.102.209.129), 00:33:36/00:02:17, RP 142.201.52.45, flags: SJC
Incoming interface: Vlan2668, RPF nbr 142.201.179.13, Partial-SC
Outgoing interface list:
Vlan2, Forward/Sparse-Dense, 00:33:36/00:02:17, H
sh ip mroute 233.102.209.129 count
IP Multicast Statistics
200 routes using 128282 bytes of memory
104 groups, 0.92 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 233.102.209.129, Source count: 0, Packets forwarded: 0, Packets received: 0
sh ip pim neighbor vlan2668
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
142.201.179.13 Vlan2668 2w0d/00:01:34 v2 1 / S P G
sh ip pim interface vlan2668
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
142.201.179.14 Vlan2668 v2/S 1 30 1 142.201.179.14
sh ip igmp membership 233.102.209.129
Flags: A - aggregate, T - tracked
L - Local, S - static, V - virtual, R - Reported through v3
I - v3lite, U - Urd, M - SSM (S,G) channel
1,2,3 - The version of IGMP, the group is in
Channel/Group-Flags:
/ - Filtering entry (Exclude mode (S,G), Include mode (G))
Reporter:
<mac-or-ip-address> - last reporter if group is not explicitly tracked
<n>/<m> - <n> reporter in include mode, <m> reporter in exclude
Channel/Group Reporter Uptime Exp. Flags Interface
*,233.102.209.129 10.8.0.19 00:36:45 02:39 3A Vl2
Thanks for your help on this. As a side note -- I have a lot of other multicast sources, receivers off of this switch, and all of them seem to work fine. It's only these particular groups. Also, if I add the ip igmp join-group command to the Vlan2668 interface, the data flows. So something is wrong with the join process somewhere, but I'm not able to recognise it yet.
Brandon
