Simplest way to prioritize VoIP / VLAN
Posted on 2008-11-03
Our company spans over a three floor building. Each floor have the following equipment:
2610PWR-48 for phones
2900-48 for computers.
A total of 6 switches
The 2900's are interconnected via 10Gbps fibre link between the floors. And the 2610's connects to the 2900's in each floor via 2Gbps trunk (2 ports used). To bring the traffic to the Phone Central (connected to the 2610) in the upper floor, a separate VLAN is established (ID2) for VoIP. As an example, VoIP traffic from first floor goes like this:
Phone - 2610 - (2Gbps link) - 2900 1st floor - (10Gbps link) - 2900 3rd floor - (2Gbps) - 2610 - Phone Central.
My question is simple: To have each switch prioritize VoIP traffic, is it enough to go to Configuration tab - Quality of Service - VLAN Priority and set the 802.1p setting for VLAN ID 2 to "7 - Highest Priority"?
Can someone explain if the DSCP setting must be used?
My entry on this page looks like this:
VLAN Name (Vlan ID) DSCP Policy 802.1p Priority
Telephony(2) Disabled 7 - High Priority
And must this setting be made on each switch?
Any comments appreciated.