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  • 1.  Assistance with multicasting

    Posted Jul 19, 2024 07:39 AM

    I am working on a 3CX VOIP install for a school district. The server is hosted on  Hyper-V. New phones are supposed to be identified via pnp via 224.0.1.75. However, this is not working via two 2930 Aruba switches. I have attempted to manually configure the switches with IP igmp and static groups, but the 3CX server does not see the new phones come online. I could use a config example of how to get two switches configured with multicasting with the 3CX server connected to one of the switches.

    The server indicates it is listening on 224.0.1.75: ens192
            link  33:33:00:00:00:01
            link  01:00:5e:00:00:01
            link  33:33:ff:9a:fe:a6
            link  01:00:5e:00:01:4b
            inet  224.0.1.75
            inet  224.0.0.1
            inet6 ff02::1:ff9a:fea6
            inet6 ff02::1
            inet6 ff01::1



  • 2.  RE: Assistance with multicasting

    Posted Jul 19, 2024 08:45 PM

    are you using VLAN trunking to the IP Phone? if so perhaps you can use DHCP option 132 to assign the VLAN for them and then igmp could kick in.



    ------------------------------
    If my post was useful accept solution and/or give kudos.
    Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
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  • 3.  RE: Assistance with multicasting

    Posted Aug 02, 2024 02:43 PM

    I apologize for the very long delay in getting back to you. We found a workaround and got the new phone system up and running, but I am circling back to find a resolution to the issue. Option 132 is unnecessary, as the phones find the VoIP VLAN fine and receive the correct IP. However, in the current setup (Aruba 2930 switches and Hyper-V) the phones do not connect to the multicast address of the 3CX server, as they should for pnp/registration. The VM is setup on Hyper-V with external networking, so multicasting should be available, and the server indicates it is listening for multicast. Haven't discovered the fix yet.

    Thanks for your original reply.


    Original Message


  • 4.  RE: Assistance with multicasting

    Posted Aug 06, 2024 03:25 AM

    Are the phones and the 3CX server in the same VLAN? In that case, multicast should just work, unless you intentionally broke it (with ACLs or so).

    If phones and server are in different VLANs, you should setup multicast routing in order to get the traffic across a VLAN/subnet boundary.



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------

    Original Message


  • 5.  RE: Assistance with multicasting

    Posted Aug 07, 2024 03:17 AM

    If you don´t configure anything multicast traffic will just be flooded on the VLAN like broadcast traffic. If you configure igmp snooping on the vlan you also need to configure an igmp querierer on the vlan (that is typically done on the core router). Typically you enable igmp snooping on the access switches and igmp and a igmp querier on the core router.

    https://www.arubanetworks.com/techdocs/AOS-CX/10.14/HTML/multicast_6200-6300-6400-8xxx-9300-10000/Content/Chp_igmp/igmp_cmds/ip-igm-ena-dis6.htm

    https://www.arubanetworks.com/techdocs/AOS-CX/10.14/HTML/multicast_6200-6300-6400-8xxx-9300-10000/Content/Chp_igmp/igmp_cmds/ip-igm-que.htm


    Original Message


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