Voice and data on Catalyst 2950C

[tony.h]

IOS:c2950-i6q4l2-mz.121-22.EA1.bin

Configuration:

interface FastEthernet0/2

description IP Phones&PCs

switchport mode access

switchport voice vlan 200

mls qos trust device cisco-phone

mls qos trust cos

no snmp trap link-status

auto qos voip cisco-phone

spanning-tree portfast

end

If I configure the phone to Vlan 200, the phone can pick up the DHCP address for phone.

The pc connected to phone can pick up DHCP address for data.

Could anyone please advise why and how?

Thanks,

Tony

[Aaron Harrison]

Tony

The switchport voice vlan 200 command instructs an IP phone that you plug into the port to work in VLAN 200 by a CDP exchange at startup... You shouldn't actually have to configure the VLAN on the phone yourself..

The PC attached to the phone will go into the normal vlan for the port which in this case will be 1 as it is left at default...

Basically the link between the phone and switch is a dot1q trunk.