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New Member

Polycom getting DCHP address from wrong VLAN


I have been tearing my hair out on this issue for 2 days, any help would be appreciated.

We have a normal network and a Cisco SGE2010P switch - a 48 port PoE switch

There are two VLANs, 1(data) & 50(VoIP).  When Polycoms are connected to the switch with VLAN 50 hard coded in the config they grab a DHCP address from VLAN 1, the PVID for the switch port.

The ports have membership in VLAN 1 as the PVID and VLAN 50 as tagged traffic.  I know the VoIP DHCP server is working because if I change a port to have a PVID of 50 any device gets the address from the VoIP DHCP server.

I have tried the ports as 'general' and 'trunk' with no success.

Any help would be greatly appreciated, I don't have much hair left!


  • LAN Switching and Routing
Everyone's tags (1)

Re: Polycom getting DCHP address from wrong VLAN

Hello ,

have you tried :

interface x/y


switchport mode acc

switchport access vlan 50

[later edit]

Sorry it s a text-gui

The interface configuration should be with PVID 50.

Port vlan mode : access.


New Member

Re: Polycom getting DCHP address from wrong VLAN


Thank you for the response.

I had the PVID 1 one as there is a computer plugged into the phone.  The computer does need to be on VLAN 1.

The physical layout is:

switch <-> Phone <-> Computer

The phone does not alter the packets the the computer sends.

I would like the computer on VLAN 1, & the phone on VLAN 50.

None the less, I will try it in the morning...willing to try anything!


Re: Polycom getting DCHP address from wrong VLAN

switch config port :

Untagg vlan 1

tag vlan 50

DHCP server :  add option on dhcp server for vlan 1,  to set the voice vlan ( this is what is used for some nortel iphones - 191 )

Also read :

Assigning VLANs

By default, the voice VLAN is unspecified. This means that voice and data traffic are untagged and transported in the native VLAN.



New Member

Re: Polycom getting DCHP address from wrong VLAN


Thanks for the link.

We have been setting the VLAN manually via the menu config.

I don't think we have the answer, I will keep looking.