Please can someone help. I am configuring Cisco 3560's to support Nortel phones. I have configured ports to be switchport mode dynamic desirable and have configured both a voice and access vlan as per below:
interface range FastEthernet0/1 - 23
switchport access vlan 102
switchport mode dynamic desirable
switchport voice vlan 202
mls qos trust cos
As CDP is not enabled I understand the need for the port to trunk, but will QoS be enabled? According to the Cisco website, the switch will ignore cos values if received from a non Cisco Ip phone on a voice vlan.
Make sure you configure the Nortel phones to use vlan 202. They don't understand a 'voice vlan' in the same sense that a cisco phone does, but they will use a trunked port and send voice traffic tagged with a particular vlan number. Really, you don't need the voice vlan statement here, just a trunked port that's allowing your internal voice network vlan traffic over it. I also would suggest that you force the switchport mode to trunk, rather than desirable (assuming your Nortel phones are being configured for trunked mode. Default for Nortel phones is non-trunked, I believe)
The qos statement that you have should trust all COS values coming over the port, regardless of whether its a Cisco phone or not.
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