Wireless Access

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  • 1.  Optimization for Bonjour/MDNS in Bridge mode

    Posted Apr 22, 2026 06:55 PM

    I was recently asked to migrate from Tunneled SSIDs to Bridged and combine the subnets for wired and wireless MacOS devices.  These devices must use Bonjour to connect to display panels on a separate VLAN.  After the change, many APs that have multiple MacOS devices are getting hammered with multicast and broadcast traffic.  Is there a recommended way to handle this multicast and broadcast traffic in bridge mode where the bridged VLAN carries potentially 3000 MacOS devices?  These are primarily on AP515s connected to Aruba 2930 and 6200 switches.  Controlling the traffic from the switches is also a possibility if desirable.  Currently in a MM MD network running 8.10.



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    -Bill
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  • 2.  RE: Optimization for Bonjour/MDNS in Bridge mode

    Posted Apr 24, 2026 07:11 AM

    I would turn on the following:

    DMO: https://arubanetworking.hpe.com/techdocs/aos/aos10/design/bc-mc/dyn-mc-optimisation/
    MTO: https://arubanetworking.hpe.com/techdocs/aos/aos10/design/bc-mc/mcast-tx-optimisation/

    Broadcast Filtering: Use this to control what kind of broadcast traffic you want to filter from being broadcast out from the APs. ALL would be preferred, but make sure none of your clients rely on broadcasts over the air.



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    Dustin Burns

    Lead Mobility Engineer @Worldcom Exchange, Inc.

    ACCX 1271| ACMX 509| ACSP | ACDA | MVP Guru 2022-2023
    If my post was useful accept solution and/or give kudos
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  • 3.  RE: Optimization for Bonjour/MDNS in Bridge mode

    Posted Apr 24, 2026 09:03 AM

    Don't enable DMO unless you actually have IP multicast on the network you are looking to optimize. DMO is only meant to optimize explicitly joined IP multicast groups. If enabled, it will allow multicast flooding to bypass other multicast controls.

    From the doc:

    "When DMO is enabled, multicast DNS (MDNS) and simple service discovery protocol (SSDP) frames are forwarded irrespective of the broadcast filtering option applied to the WLAN."

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    Original Message


  • 4.  RE: Optimization for Bonjour/MDNS in Bridge mode

    Posted Apr 27, 2026 12:21 PM

    Thanks for the suggestions. Since I'm still on version 8, not all of them were available to me.  I experimented as close as possible and was able to get a modest improvement but nothing close to what I needed.  I wound up converting back to tunnel mode until I can update to central and version 10.



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    -Bill
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  • 5.  RE: Optimization for Bonjour/MDNS in Bridge mode

    Posted May 05, 2026 01:06 AM

    Also, enable IGMP snooping on the switches' user VLANs to control the Multicast flooding



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    Harendra | ACEX165 | ACEP | CWDP | CWSP
    If you find my answer useful, consider giving kudos and/or mark it as the solution.
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    Original Message


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