Voice VLAN

25 03 2012

1. Voice VLAN is not a trunk.
2. Voice VLAN is supported on an access port not a trunk port.
3. Even IP phones and workstations share the same physical ports, they are treated differently. IP phones’packets are tagged, but PC’s packets are untagged. This key role is played by CDP.
4. Voice VLAN is not on a trunk port, it is called as multi VLAN access port.
Group Study: Good Explanation of the Voice VLAN
5. DHCP could distribute IP address correctly after IP phones exchange CDP with the switch. DHCP on data VLAN and DHCP on Voice VLAN are different.

Cisco QOS
QoS Frequently Asked Questions
Configuring QOS


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