Re: switchport priority extend cos 0

From: Uchil Perera (uchil.groupstudy@yahoo.com)
Date: Mon Nov 26 2007 - 11:01:35 ART

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Hi,
   
  Below is an excellent document about voice VLAN.
   
  http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_example09186a0080722cdb.shtml
   
  Regards
   
  Uchil Perera
  CCIE # 18536

CCIE <ccie@axizo.com> wrote:
  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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