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9.3

Polycom IP Phones pull DHCP from wrong VLAN

Asked by Akostech in Dynamic Host Configuration Protocol (DHCP), Voice Over IP

Tags: Polycom, 501 IP

I have a Cisco 3560 Switch that has each port configured for a data VLAN (VLAN 10) and a voice VLAN (VLAN 2).  DHCP on the Data VLAN comes from a Windows 2003 server.  DHCP for the Voice VLAN comes from a Cisco PIX firewall.

Data subnet 172.17.100.x
Voice subnet 192.168.0.x

Here is a sample config from one of the ports on my Cisco 3560 switch
interface FastEthernet0/5
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport mode access
 switchport voice vlan 2
 mls qos trust cos
 spanning-tree portfast

The problem is that phones when booted up pull DHCP from the data vlan.  to get them to pull from the Voice VLAN i have to hard code the switchport access to VLAN 2  on the port they are connected to.  Once they bootup and pull the correct IP, I change the switchport access back to VLAN 10.  The desktop pcs are connected to the same data cable through the phone.  If I turn the Windows DHCP server off, the phones boot up and pull the correct VLAN 2 IP address just fine.

Am I missing something in my Windows DHCP scope options?
 
 
[+][-]11/18/08 10:14 PM, ID: 22991907Accepted Solution

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About this solution

Zones: Dynamic Host Configuration Protocol (DHCP), Voice Over IP
Tags: Polycom, 501 IP
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Solution Provided By: th3w01f
Participating Experts: 1
Solution Grade: A
 
 
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