Multicast inter-vlan traffic intermittently not forwarded to receiver host
I've configured our network for multicast routing but on one of our building network ( L3 with 3750 and access layer with 2950 switches), the multicast traffic is intermittently not forwarded between 2 vlans.
The senders are located in a vlan 192, the receiver is located on a vlan 249. Both vlans are routed on the same 3750.
The IGMP group registration seems to work fine. The multicast mroute table looks good but sometimes, the receiver does not see the multicast traffic arriving on the port. It's intermittent. Sometimes, it receive the multicast traffic sometimes not. ( the traffic concern video camera over IP)
Could you please help me to solve the issue ?
Network config is the following
Distribution layer - two 3750 with 2 vlans 192 and 249 (in HSRP)
What happens is that clients in vlan 67 routed at 3750-C67 can well see cameras located on vlan 192 of the building M249.
But clients in vlan 249 get troubles to see the cameras in the vlan 192 routed on the same C3750-M249. Sometimes it works, sometimes disconnected/reconnected a lot.
Note that a client in vlan67 can see cameras located in vlan 192 (of C67 building) routed at C3750-C67
I already configured the C6509 as mapping agent for the multicast groups 220.127.116.11/24.
I don't understand why it works fine on building where vlan 67 and 193 and Not on the other.
Are you sure I need to configure the first 3750 as a mapping agent since I already have mapping agent configured on the COre switch ?
Configuration on the core switch:
ip pim send-rp-discovery Loopback1 scope 10
C6509# sh ip pim rp mapping 18.104.22.168 PIM Group-to-RP Mappings This system is an RP-mapping agent (Loopback1)
Group(s) 22.214.171.124/24 RP 172.16.1.244 (?), v2v1 Info source: 172.16.1.244 (?), elected via Auto-RP --> This is well the L3 3750 switch of the M249 Uptime: 3d19h, expires: 00:02:44 RP 172.16.1.243 (?), v2v1 Info source: 172.16.1.243 (?), via Auto-RP Uptime: 1w1d, expires: 00:02:52
DISTRI1_M249#sh ip pim rp Group: 126.96.36.199, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 188.8.131.52, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 184.108.40.206, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 220.127.116.11, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 18.104.22.168, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 22.214.171.124, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 126.96.36.199, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 188.8.131.52, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24 Group: 184.108.40.206, RP: 172.16.1.244, v2, v1, next RP-reachable in 00:00:24
Multicast inter-vlan traffic intermittently not forwarded to rec
Please refer to this document it seems that you experiencing some expire timer issue:
d. S,G expiry timer
Finally, Cisco has made a modification to the operation of the S, G expiry timer in IOS. There is now a CLI knob to allow the state for a S, G to stay alive for hours without any traffic being sent. This fix was in response to a customer request in a PIM-SM environment to maintain the state and not fall back to *, G forwarding. The command is "ip pim sparse sg-expiry-timer" and is documented in the command reference:
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