I have a customer with a mixed switch environment, they are currently using HP/3com A5120s for the core of their network with Cisco 3560s at the edge.
Currently they are using VLAN 1 for Management and Data ( I will change this out once the entire network is converged) and 200 for Voice.
The A5120s are set to Auto Voice VLAN 200 and the MAC address of the Mitel phones is entered in the OUI list.
The Cisco 3560s use the following commands:
switchport access vlan 1
switchport voice vlan 200
mls qos voip trust
auto qos voip trust
All switches are connected with trunk links (all VLANs allowed). Plugging the uplink from the Mitel 3300 into the A5120 phones works with PC port to VLAN1 but I get a DHCP timeout on the 3560's, although the proper VLAN 200 shows on the screen.
I also added option 43 to our Windows DHCP sever (VLAN1) with the string settings: id:ipphone.mitel.com;sw_tftp=192.168.1.2;call_srv=192.168.1.2;vlan=200;l2p=6;dscp=46;
Tonight I finally settled on moving the Mitel 3300 uplink to one of the 3560's untagged in VLAN 200. CDP found the phones and gave them the proper IP address using option 125.
Problem is the A5120s and a 3560 in the chain still have the DHCP timeout error... Any ideas?