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Duplicate Packets for PA/Intercom system over CX network

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  • 1.  Duplicate Packets for PA/Intercom system over CX network

    Posted Dec 08, 2021 11:59 AM
    We replaced all switches for an ISD a few months ago and their old PA/Bell system worked perfectly fine. Now they have installed a new system by "Front Row", and when an announcement or bell rings, it crackles/generally isn't super clear.  Their support has told us that what they do is add a header (or something to the header) that allows the system to work, and its all based on unicast.  We did a packet capture, and it is showing two packets for every packet being sent on that network, which according to them must be coming from something on the network. I cannot fathom what would be doing this, anyone have any ideas?  The core is a 6300m SFP+ and all access are 6200, stacked where there are more than one switch.

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    Alex Wright
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  • 2.  RE: Duplicate Packets for PA/Intercom system over CX network

    Posted Dec 09, 2021 03:58 AM
    Could we get the wireshark snippet of the duplicates? Curious of the Source Mac. 

    How about the Front Row system? How is it connected to the network?

    A hub is what is coming to mind .. any chance something in the network acts like a hub device

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    Robin Puliparambil
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