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Author Topic: Question about Avaya port configs for wireless APs  (Read 2209 times)

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Offline Brhodgins

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Question about Avaya port configs for wireless APs
« on: October 27, 2014, 02:52:46 PM »

Can anyone offer some insight as to why my new APs work on Cisco trunk ports, but not Avaya ones? I have two SSIDs, one on VLAN 10 for mobile devices and guests and one on the VLAN 5 for domain access. In the hub room, I have a Cisco 2960x with 3 APs connected to 3 trunk ports. All are working. In the server room I have a ERS4548GT-PWR with the same port config to 3 more wireless APs but cannot communicate with them at all. Only when I change them to an access port can I reach them.
They are Ubiquiti APs.
Am I missing something?


Offline tbigby

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Re: Question about Avaya port configs for wireless APs
« Reply #1 on: October 27, 2014, 08:15:52 PM »
Hi Brhodgins, I'm not familiar with the Ubiquity APs but my guess would be that they need a management VLAN to communicate with each other/a controller.

On the APs that I've seen, the management VLAN will be untagged - ie. there won't be a VLAN ID transmitted for that VLAN. For other VLANs, like your VLANs 5 and 10, the tag '5' or '10' will be included in the packet.

Cisco as far as I know leaves the Default VLAN as untagged on a Trunk port, so your APs will be communicating on whatever the Cisco Default VLAN is.

Avaya switches however tag all packets on a Trunk port, so your APs are not seeing any untagged VLAN for their management.

If you change the Avaya ports to 'untagPVIDOnly', and set the 'PVID' (Default VLAN) of the ports to the same VLAN as the Default VLAN on your Cisco switches, I'd expect the APs to then work.

Cheers, Tony
Tony Bigby