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Multicast accross Vlans on one switch

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  • 1.  Multicast accross Vlans on one switch

    Posted Jun 02, 2021 05:28 PM
      |   view attached
    HI,

    I contacted HP support who said they will get back to me but in the mean time suggested joining this group.

    I have a Aruba 2930 switch on this switch currently I have muticast traffic entering on port 23. I can recieve this traffic if I plug into another port that is in the same vlan 2101 (port 12).

    However i want to also be able to receive the multicast traffic on vlan 100 (ports 1 - 11) can any one have a look at my latest attempt below and make any suggestions

    Thank you

    Paul



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    Paul Lawrence
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    Attachment(s)

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    currentConfig.txt   2 KB 1 version


  • 2.  RE: Multicast accross Vlans on one switch

    Posted Jun 04, 2021 03:37 PM
    you can do it by configuring vlan mirroring.

    https://community.arubanetworks.com/community-home/digestviewer/viewthread?MID=25100

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    Ahmet Calis
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    Original Message


  • 3.  RE: Multicast accross Vlans on one switch

    EMPLOYEE
    Posted Jun 04, 2021 03:37 PM

    Hi Paul,

     

    There is no IGMP enabled for VLAN 2101, so I believe you are receiving a broadcast traffic (not pure broadcast, but multicast traffic is treated in the same manner) for this VLAN rather than multicast. IGMP is disabled by default for this switch model (operates at the VLAN context level) and the switch simply floods all IP multicast traffic it receives on VLAN 2101 through all ports on that VLAN.

     

    You have pim-dense mode. Why did you configure rendezvous point for PIM?  There are no shared trees in DM and shortest-path trees are built - multicast traffic is flooded and then pruned back where no receivers are present.

     

    Can you please give us more information about both the source and the receiver you are testing with (receiver in VLAN 100) – IP addresses, ports used, multicast IP address etc.? How did you test the multicast for VLAN 100 and what were the results?

     

    The following outputs will be helpful as well:

    show ip igmp vlan 100

    show ip igmp config

    show ip igmp groups

    show ip pim interface

    show ip mroute

    show ip mroute [multicast-ip-addr  source-ip-addr]

     

    Here a few sources of information for similar configurations:

    https://support.hpe.com/hpesc/public/docDisplay?docId=c03361122&docLocale=en_US

    https://community.arubanetworks.com/blogs/esupport1/2020/04/27/arubaos-switch-how-to-configure-pim-dense-mode-multicast-routing-on-two-switches

     

    16.10 Multicast Guide for the 2930 Switch:

    https://support.hpe.com/hpesc/public/docDisplay?docLocale=en_US&docId=a00091308en_us

     

    Regards

    Stanislav



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    Stanislav Naydenov
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    Original Message