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  • 1.  1930 IGMP Snooping enabled but still multicast flooding

    Posted 02-27-2023 12:00 PM
    Hello,

    Anyone familiar with multicast and IGMP snooping on the 1930?
    I have a "Aruba 1930 Instant on 24G 4SFP+" with software version 2.7.0. IGMP Snooping is enabled but the switch is still flooding multicast.
    Any suggestion what to do or test?

    Setup:
    1. On switch port 1 I have connected a server which is transmitting multicast feeds on address 239.1.1.n where n is 1 - 9 . The server also runs a igmp querier.
    2. On switch port 2 I have connected a client listening / Join on 239.1.1.1
    3. On switch port 3 I have connected a laptop running wireshark
    The switch configuration is default. The only changes I made (section switching/igmp snooping) is to enable the global igmp snooping function and also enable igmp on the VLAN.

    Result:
    The result is that on port 3 (laptop+wireshark) I receive all multicast feeds that are transmitted by the server into port 1. i.e. 239.1.1.1 - 9.
    This is not what should happen, the switch should not forward any of the multicast’s to port 3 since the laptop has not joined any of the multicast groups.

    Details:
    On webgui page “IGMP Snooping Multicast Router Interface Configuration” it says "Dynamic: 1”. I guess this is correct. The switch understands that on port 1 we have incoming multicast traffic.
    On page “Multicast Forwarding Database” I see one row saying that “239.1.1.1” is forwarded to port 2. This is also correct because the client has joined this group address.
    So the status information in the UI looks OK but the reality as seen on port 3 with laptop+wireshark shows that the switch is flooding multicast traffic to all ports.

    Kind Regards
    Johan


  • 2.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Employee
    Posted 02-28-2023 04:39 PM

    Hi Johan,

    I have my team looking into this for you. I appreciate your patience. 



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    Aruba Instant On Communications
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  • 3.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Employee
    Posted 03-20-2023 10:29 PM

    Hey Johan,

    My apologies for the delay, but I was advised that you should contact our customer support team. https://www.arubainstanton.com/contact-support/ 



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    Aruba Instant On Communications
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  • 4.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Posted 19 days ago

    Was wondering @JT6 , @JM52 what ever came of this, was there a bugfix ?



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    A.N.
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  • 5.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Posted 19 days ago

    Was wondering @JT52  @JT6 was this fixed ?



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    A.N.
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  • 6.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Posted 19 days ago
    Hi,

    No it was not fixed.

    /JT6






  • 7.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Posted 10 days ago

    Try switching to IGMP v3 and see if that helps



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    Richard Simpkins
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  • 8.  RE: 1930 IGMP Snooping enabled but still multicast flooding

    Posted 10 days ago

    Im having this exact problem on a customer site with IPTV. despite having a querier set and all the switches having snooping turned on. Im still getting mulkticast flooding. Is there any update regarding this????



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    Richard Simpkins
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