Multicast IGMP join (Report) packets are not passing through Cisco 3650

[Bkay100]

Hello,

I am facing a strange issue with multicast traffic through Cisco 3650 switches. The switches are configured as L2 switches - no ip routing & ip multicast-routing. Also I don't want to use the ip igmp snooping, so it's also disabled using the command no igmp snooping at global level. I don't bother about the traffic load due to broadcasting/flooding the MC packets, because it's a test environment which intended to work in that way.

The switch has multiple vlans configured. Mulicast receivers are placed in multiple vlans and use igmp join/leave messages to join the multicast streams. The cisco 3650 switch receives the join (report) messages through a trunk interface, however they are not forwarded/broadcasted to corresponding ports (vlans). It simply drops the packets. 

A similar setup with Cisco 3750 with same configuration works perfectly fine. The only difference is 3750 runs IOS sw while 3650 runs IOS XE. 

Can someone help me with a clue to identify the issue with 3560 why it drops the igmp join request? 

Any help would be greatly appreciated.

Thank you.

[balaji.bandi]

Can you post configuration to look - what is working and what is not working, do you see any Logs .

also woth looking command difference :

http://www.patrickdenis.biz/blog/multicast-configuration-ios-ios-xe-and-nx-os/

[paul driver]

Hello

If you are using multiple vlans ( ie intervlan routing) you would probably need to enable ip multicast routing and PIM but if you dont want to use this and you have multiple receivers on multiple vlans I would strongly suggest to enable igmp snooping to negate unwarrented flooding of MC and igmp snooping querier for the sending of the igmp memebrship queries.