Hi All,
I had saw some post about 3550 voice vlan in this forum. Many people said that the voice vlan just can be configured in trunk mode as follow:
int f0/1
mls qos trust cos
switchport trunk encap dot1q
switchport mode trunk
switchport trunk native vlan 1
switchport voice vlan 100
But in the manual of 3550, the manual said the voice vlan just can be configured in " access port " and the port that configured with voice vlan can use dot1x authentication. And dot1x authentication just can be configured in the ports that explicitly config " switchport mode access" command. And I had saw some training material ( but not cisco's, like IPexpert and some others), I had saw some samples that they config voice vlan as follow:
int f0/1
switchport mode access
mls qos trust cos
switchport voice vlan 100
so that make me confused. many people said second sample ( that use "switchport mode access") is wrong because when you use " switchport mode access" , the port can not accept the 802.1q tag, so the port can not recoginze the traffic is data or voice. That's also reasonable. So, I am really very confuse. Hope the experience can give me a hand. Thank you!
Waimen
