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Assigning VLAN to VVX400 Phone via DHCP Scope Options

Occasional Visitor

Assigning VLAN to VVX400 Phone via DHCP Scope Options


Hi all


We have a need for these phones (testing with VVX400) to automatically select the correct VLAN when plugged into a switch.


Right now I am able to do it by advertising the voice VLAN through LLDP settings on the port. This seems to work OK such as it is, however some of our customers do not have switches where this kind of configuration is available.


I was following this guide:


In this guide, you create DHCP Scope options on your DHCP server (at 128, 144, 157, 191) with string value VLAN-A=11;


But I had no luck. Phone just gets IP from untagged (native) VLAN.


I was able to get into the settings and found that the "VLAN ID Opt" was 129 - so I tried the same but on DHCP code value 129. Still getting regular VLAN.


Can anyone advise on what I might be doing wrong? My suspicion is that the string value may not be correct for this phone. Other potentials include globally disabling LLDP on this switch (which I'm not even sure you can do).


Thanks and regards



Message 1 of 2
Polycom Employee & Community Manager

Re: Assigning VLAN to VVX400 Phone via DHCP Scope Options

Hello John,

welcome to the Polycom Community.

The community's VoIP FAQ post quoted by yourself does show how to use the phone logs and/or wireshark to troubleshoot this.


This should enable you to check what is wrong in your setup.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services


Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
Message 2 of 2