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Automatic Voice VLAN Membership Change

Automatic Voice VLAN Membership Change

Automatic Voice VLAN Membership Change

Hi everyone. I'm somewhat new to switches in general, but very new to Avaya switches.

I have several Avaya ERS 5520 switches in my environment. We are using IP phones on these switches, with the computers directly connected through the back of the phones. All switches are running software.

When we unplug these phones, it removes the ports from the list of members of the voice VLAN. We plug them in, and it puts them back. While that is ok, it can be a little disturbing to my manager and doesn't want that to happen.

On 2 of these switches, we've had them suddenly remove almost all ports from the voice VLAN without warning.

Are these due to spanning tree removing them or is it a bug?



RE: Automatic Voice VLAN Membership Change

Two things to help us understand the question:

1. Please show us this "list of members of the Voice VLAN"

2. Please show us a sanitised switch config.

RE: Automatic Voice VLAN Membership Change

The voice vlan is dynamically created when a member joins (a bit like old protocol vlans). With normal operation the port is a data port until the switch recognizes a phone either via adac or lldp, then the port is added to the voice vlan as well. Once the phone is removed, so is the port from the voice vlan.

If you want a permanent vlan membership, you can remove the voice-vlan setting then create a new vlan with the same vid. Then add all ports to it, set the pvid to the data vlan and set the port to untagpvidonly.

RE: Automatic Voice VLAN Membership Change

Thanks. It isn't really causing problems, but anyone else looking and not knowing, it can be an issue.

In regards to removing the ports without warning, we've had another issue with the 6.2.4 software, where setting an IP address on a VLAN with a subnet mask of, assigning the VLAN to a fiber SFP, causes instability in the connection and slows it down. Changing the subnet mask to .248 resolves that, so I'm not worried about it, but it's all very strange.

I appreciate everyone's help with the previous issue.

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