Voice & Data VLAN Configuration

Unanswered Question
Jan 13th, 2010

Greetings, We had a vendor install all our switches and I've found that the switch configurations for voice & data are a little different. They are configured either as (where vlan 10 = data, vlan 172 =voice):

interface FastEthernet0/2
switchport access vlan 10
switchport trunk encapsulation dot1q
switchport mode access
switchport voice vlan 172
mls qos trust dscp
spanning-tree portfast

OR....

interface GigabitEthernet0/6
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 172
mls qos trust dscp
spanning-tree portfast

I've also see the voice configured as:

switchport access vlan 172

And some ports (that are not connected to 'static' devices such as a router) configured with switchport mode trunk, and also had voice running on it.

I'm trying to get all configurations consistent across the board. Can anyone tell me if there is a best way to approach this? Is one configuration going to give better performance than another?

Thanks,

Chris

P.S. The switches are Catalyst 3650, running 12.2 (35)SE5 IOS.

I have this problem too.
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Reza Sharifi Wed, 01/13/2010 - 08:27

Hi Chris,

For your first solution, Cisco calls this a Multi-Vlan access port, and NOT a trunk port. But we all know if you have more then one vlan on the port then it is trunk.  I would go with your second option:

interface GigabitEthernet0/6
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 172
mls qos trust dscp
spanning-tree portfast

https://supportforums.cisco.com/thread/1003209?tstart=30

HTH

Reza

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