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BrianFlag for United States of America asked on

Should we disable voice vlan authentication on our network switches?

On our network switches, we have some voice configurations for the ports that the phones are connected to.  One of the commands disables Voice VLAN Authentication. I don't know why we do it this way, it's just the config that our sales engineer gave us.

Before asking my question, let me first say that I do not want links posted, I just want people to answer who have a good understanding and can put it into word.  I've already done a bunch of searching on this subject online.  My question is, why would we disable voice vlan authentication?  If we have both a phone and PC on the same port, would we still want to disable voice vlan authentication?  Thanks!


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Craig Beck

8/22/2022 - Mon
Craig Beck

When you say "disable Voice VLAN authentication", can you please clarify what this means? Are you running 802.1x or are you simply using something like CDP/LLDP to determine that a phone is a phone to put it on the Voice VLAN?

What switches are you using?

We are using LLDP.  In the past, we used the command "voice vlan auth disable", but after a switch upgrade, the command is now "switchport voice vlan override-authentication".  I'm sure voice vlan auth has to do with 802.1x, which I would assume we would need a server handling authentication (radius server).  So given that we are using LLDP, I'm assuming this is the reason we want to disable voice vlan auth, is that correct?  I'm guessing using 802.1x for phones would be to keep someone from plugging in a rogue phone?
Craig Beck

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