Wireless Access

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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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IGMP max-members-per-group

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  • 1.  IGMP max-members-per-group

    Posted Jan 30, 2012 02:56 PM
    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


  • 2.  RE: IGMP max-members-per-group

    EMPLOYEE
    Posted Jan 31, 2012 11:18 AM

    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....

     

     

     

     

     



  • 3.  RE: IGMP max-members-per-group

    Posted Feb 07, 2012 07:53 AM

    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>