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Multicast MoH over GRE Cannot locate GCE with IGMP for internal calls

Hi,
i have an issue where Music on Hold streamed from a Cisco Call Manager does not play for internal calls but works for external calls from the voice gateway
The Call Manager (7.0.1.21018-4) is located in a Data Centre and the phones at a branch office.

The voice gateway (2841) at the branch with an E1 has a sub interface in the same voice vlan as the phones and has a gre tunnel to the core switch at the DC (6509E).

The core Switch is configured as the RP, pim-sparse mode enabled for the tunnel interface and the vlan interface that the MoH Source is in.

At The Branch, the voice gateway (2841) has pim-sparse configured on the voice vlan sub interface and tunnel interface.
the LAN consists of a 3750-24 switch (Std Image) and a 3560G(stdImage) as the core with other switches as spokes.

All switches have dynamically discovered the igmp mrouter interface correctly, but when the phones try to join the group, the following messages are logged on the 3750 where the Voice gateway handling multicast routing is connected

attached is an igmp debug on the 3750
I could not find much on the "cannot locate GCE error"
i can't see any pim joins on the core switch.

.Apr 15 18:56:55.907 aestd: IGMPSN: group: Group Query 239.200.63.131 received on Vlan 71, port Gi1/0/11
.Apr 15 18:56:55.907 aestd: IGMPSN: MCAST IP address 239.200.63.131, MAC address 0100.5e49.4084
.Apr 15 18:56:55.907 aestd: IGMPSN: Can not Locate gce 0100.5e49.4084, on Vlan 71
.Apr 15 18:56:55.907 aestd: IGMPSN: group: Distributed platform handles the GSQ 239.200.63.131 received on Vlan 71, port Gi1/0/11
.Apr 15 18:56:55.907 aestd: IGMPSN: group: Report sending fail for GSQ 239.200.63.131 received on Vlan 71, port Gi1/0/11 - Flood
.Apr 15 18:56:55.907 aestd: (l2mcsn_flood_l2mc_pak) IGMPSN flood pak to vlan 71
.Apr 15 18:56:55.907 aestd: IGMPSN: router: Received IGMP pak on Vlan 71, port Gi1/0/11
.Apr 15 18:56:55.907 aestd: IGMPSN: router: Is a router port on Vlan 71, port Gi1/0/11
.Apr 15 18:56:56.905 aestd: IGMPSN: Received IGMP Query for group 239.200.63.131 received on Vlan 71, port Gi1/0/11
.Apr 15 18:56:56.905 aestd: IGMPSN: group: Group Query 239.200.63.131 received on Vlan 71, port Gi1/0/11
.Apr 15 18:56:56.905 aestd: IGMPSN: MCAST IP address 239.200.63.131, MAC address 0100.5e49.4084
.Apr 15 18:56:56.905 aestd: IGMPSN: Can not Locate gce 0100.5e49.4084, on Vlan 71
.Apr 15 18:56:56.905 aestd: IGMPSN: group: Distributed platform handles the GSQ 239.200.63.131 received on Vlan 71, port Gi1/0/11
.Apr 15 18:56:56.905 aestd: IGMPSN: group: Report sending fail for GSQ 239.200.63.131 received on Vlan 71, port Gi1/0/11 - Flood
.Apr 15 18:56:56.905 aestd: (l2mcsn_flood_l2mc_pak) IGMPSN flood pak to vlan 71
.Apr 15 18:56:56.905 aestd: IGMPSN: router: Received IGMP pak on Vlan 71, port Gi1/0/11
.Apr 15 18:56:56.905 aestd: IGMPSN: router: Is a router port on Vlan 71, port Gi1/0/11
 
SW1#sh ip igmp snoo mrou
Vlan    ports
----    -----
  71    Gi1/0/11(dynamic)
 
 
 
SW1#sh ip igmp snooping vlan 71
Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping                : Enabled
IGMPv3 snooping (minimal)    : Enabled
Report suppression           : Enabled
TCN solicit query            : Disabled
TCN flood query count        : 2
Robustness variable          : 2
Last member query count      : 2
Last member query interval   : 1000
 
Vlan 71:
--------
IGMP snooping                       : Enabled
IGMPv2 immediate leave              : Disabled
Multicast router learning mode      : pim-dvmrp
CGMP interoperability mode          : IGMP_ONLY
Robustness variable                 : 2
Last member query count             : 2
Last member query interval          : 1000
 
 
interface GigabitEthernet0/0.71
 encapsulation dot1Q 71
 ip address 10.10.71.1 255.255.255.0
 ip flow ingress
 ip pim sparse-mode
 ip igmp proxy-service
 ip cgmp
 snmp trap link-status
 h323-gateway voip bind srcaddr 10.10.71.1
end

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alistairsam
Asked:
alistairsam
1 Solution
 
cstosgaleCommented:
Firstly, I would disable IGMP snooping to determine if this is causing the issue or not.

Next, can you post a show ip mroute from the remote site router? I'm pretty sure the error you are seeing above is because the router is not responding to the IGMP query.
0
 
alistairsamAuthor Commented:
hi
i fixed this issue by changing the multicast group address to a lower address. i came across a forum where it was mentioned that there is an issue with arp resolution with higher multicast addresses.
once i changed the address, it worked straight away.
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