IGMP and link-local multicast

[Trent211111]

We currently have 1 VLAN that BIAMP and Crestron equipment live on and both sending Multicast traffic. All Multicast traffic that is in the 239.0.0.0 – 239.255.255.255 is traversing as expected however there are BIAMP and some Crestron endpoints that are sending group reports for Multicast IP addresses in the 224.0.0.0/24 range and this is one of the log message that appears:  

"May  9 18:21:18.265: IGMPSN: v3 Report has group record with invalid group address 224.0.0.251, skip it"

It appears IGMP Snooping is blocking this traffic. Would this analysis be correct and if so what corrective action should be taken? The C9300's do not seem to be capable of statically assigning Multicast addresses in this range. 

Per BIAMP Documentation Multicast link local Address's 224.0.0.230-233 and 224.0.0.251 must be used.

[Flavio Miranda]

Hi

Why dont you temporarilly disable igmp ?

 conf t

 no  ip igmp snooping

[Trent211111]

I have thought about doing that but the network is currently in production so would like to test and get recommended things to test in order first before a maint. window. But here are my concerns with that..

1)I worry that the endpoints won't be able to dynamically find/leave the stream/group they want.

2) I worry the links will get Saturated.

[Flavio Miranda]

For troubleshooting purpose in a maitenance window i think  worth  it