What is the idea behind specifying the voice VLAN under the interface

Hi,
What is the idea behind specifying the voice VLAN under the interface? (Is it needed for both 802.1P and 802.1Q?)
Regards
M

The voice vlan command is what tells the IP phone what VLAN it should use...
The idea is that setting the native vlan on the port controls what VLAN the attached PC goes into, and the voice vlan tells the phone which VLAN it should go into.
It doesn't have any direct relation to QoS, as the port could be configured to ignore or take action on QoS markings with or without the voice vlan command.
Aaron

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