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MVP
Posts: 4,301
Registered: ‎07-20-2011

IGMP max-members-per-group

We are having some issues with IGMP. For some reason we hadn't had IGMP snooping on, but now we do, which is a good thing.
Now however we are maxing out our members per group (set to 300) We have a case open (1274977) Specifically this is on the mDNS group 224.0.0.251.
We were told not to increase this limit.
What is the effect of hitting this limit? Does the switch flood after this point? or only send to those currently in the table? How are clients added/removed?
We keep getting this error :
<pim 204203>  <ERRS> |pim|  Could not add IP multicast group member 10.45.20.105
<pim 204299>  <ERRS> |pim|  Could not add member 00:03:4c:10:62:d6 to IP multicast group (10.45.20.105, 224.0.0.251), limit of 300 per group reached
Thanks
Vic
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Guru Elite
Posts: 21,269
Registered: ‎03-29-2007

Re: IGMP max-members-per-group

[ Edited ]

Apparently you can increase this but only in ArubaOS 6.1 and above:

 

(Aruba) (config) #ip igmp
(Aruba) (config-igmp) #max-members-per-group <new-maximum>

 

I personally do not know the ramifications of increasing it past this number....

 

 

 

 

 



Colin Joseph
Aruba Customer Engineering

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Aruba Employee
Posts: 64
Registered: ‎04-07-2007

Re: IGMP max-members-per-group

TAC got back to me on this.

 

Once the limit of 300 is reached new clients will not be allowed to join that multicst group. 

Increasing that size is not recommended as it will increase the flooding of traffic (no report on what it would do to the controller)

Not sure how clients are removed though you can clear them by issuing a clear ip igmp group maddr <mcast_address>

 


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