switchport priority extend cos 0

From: CCIE (ccie@axizo.com)
Date: Mon Nov 26 2007 - 08:31:07 ART


Dear Experts

 

I found this command in several scenarios of the Cisco documentation? But I
can't understand the logic why I would need the last command?

Could anybody try to explain that to me?

 

Mls qos

Int f0/1

Switchport access vlan 4

Switchport voice vlan 40

Mls qos trust cos

Switchport priority extend cos 0 <== This command

 

 

Why I would use the last command to re-tag the CoS of the data, especially
it is an access port for the data VLAN (i.e. no tags will come to me with
the data frames)

 

 

Regards,

Amin



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