I have recently configured the switchports on a Cisco Catalyst 2950 for VoIP. I done the following:
switchport access vlan 1 switchport mode access switchport voice vlan 2 mls qos trust cos spanning-tree portfast spanning-tree bpduguard
The PCs are plugged into the phones and the phones are plugged into the switchports...
Is this sufficient QoS for a single site network (meaning that I am only running Voice and Data on a single LAN with no Wide Area Routing involved).
The phones have been given a priority of 6 (not sure if these should have been 5???). I have assumed that the 'mls qos trust cos' entry configures the switchport to treat the priority 6 (voice) traffic as more important than the 'best effort' (data) traffic.
Are my assumptions correct?
I have also configured the trunks between switches as follows:
switchport mode trunk mls qos trust cos
I have had a decent amount of experience with Cisco 2950s and 3550s but have not needed, until now, needed to configure the network for VoIP.