I have configured a voice vlan and I'm planning to use Cisco Ip phones. As I understand the catalyst switches have 2/4 transmit queues per egress port. The IP-phones mark the packet with COS 5 when the switchport are configured with:
switchport trunk encapsulation dot1q
switchport trunk native vlan 2
switchport mode trunk
switchport voice vlan 20
switchport priority extend cos 0
If I choose to use default scheduling then I don't have to do any qos settings on my catalyst 2950/3500XL/4506 switches. Correct?
I can't see why I need to Issue the mls qos trust cos. The IP phone will mark the packet with COS=5.
Cisco recommendation for QOS on 3500XL
Configure the ports connected to Cisco IP phones with a PC attached to the secondary port by issuing the extended trust configuration switchport priority extend cos <0-3> command so that these frames are queued in the low priority queue.
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