Multicast traffic stops flowing after a while when using IGMP snooping

Hi all

I have the following configuration:

:

Where host 1 is a multicast traffic source and host 2 is a customer of multicast traffic. IGMP snooping is configured on both switches.
Host 2 boots and sends an IGMP report, in order to join the multicast host group 1. Given that SW2 does not know where the mrouter from the group, adds port Eth1/1 to the Group of snooping and removes the package, the IGMP packet. Once host 1 starts, it sends an IGMP query (which is flooded by the port channel), and multicast traffic starts to flow to host 2.
When I ran 'show ip Mattia snooping groups' I've seen the same result on both switches: on the two switches of the groups the Eth1/1 and the channel port, but after a while, the switch connected to the host 2 deleted the channel of the port of the group.
After consultation with the switch logs and sniff traffic on one of the channel port on SW1 interfaces, I came to the conclusion that happens since SW1 ceases to send queries generated by host 1 and responding to them locally (some proxy or something). I also noticed that IGMP reports generated by host 2 stop arriving on SW1 (since SW2 do not know that there a connected mrouter more across the channel of the port).

My questions are:

1. How does SW1 knows he should keep the channel port as part of the group, if it does not IGMP reports coming from SW2 more?

2. what happens if the host 2 is not interested in multicast traffic, but do not send and IGMP leave message (a behavior that is supported according to the Protocol, to my knowledge)? How SW1 knows he should cease to IGMP sent from host 1 query response?

Thanks in advance,

Omer.

Hello

The problem is because you have not mrouter port sw1. It is well documented by virtue

http://www.Cisco.com/c/en/us/support/docs/switches/Catalyst-6500-Series-...

There are 3 ways you can solve this problem.

1. enable Pim on Sw1.

Or

2. enable ip igmp snooping interrogator on Sw2

Or

3. create staitc mrouter port on sw2.

ip igmp snooping vlan 1 mrouter interface PoX

Tags: Cisco Network

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