Voice VLAN configuration question

From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Mon Jun 12 2006 - 12:10:51 ART


I have a voice vlan question. I have seen that there are two possible
configurations to question that says to trust the cisco phone connected
to the switchport and configure any pc/device connected to the phone to
have it's cos rewritten to 2. I would prefer the configuration for
fa0/4. However, when would we want to use the configuration on port
fa0/3? Do they not accomplish the same thing? Just trying to get a
handle on the differences here.

interface FastEthernet0/2
 switchport access vlan 10
 switchport mode dynamic desirable
 switchport voice vlan 15
 switchport priority extend cos 2
 mls qos trust device cisco-phone
 spanning-tree portfast
!
!
interface FastEthernet0/4
 switchport access vlan 10
 switchport mode dynamic desirable
 switchport voice vlan 15
 mls qos cos 2
 mls qos cos override
 mls qos trust device cisco-phone
 spanning-tree portfast

Dave Schulz

Email: dschulz@dpsciences.com <mailto:dschulz@dpsciences.com >



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