Interface Config for ONLY voice vlan?

[mac1234]

We have most of our ports configured for both data and voice using the Cisco method of using switchport voice vlan.  Example of our config:

interface GigabitEthernet1/0/1
 switchport access vlan 10
 switchport mode access
 switchport voice vlan 20
 no mdix auto
 spanning-tree portfast
 spanning-tree guard root
end

However, I want to change this config to simply allow the voice vlan 20 on this port. What would be the proper config?

Would I  simply remove the switchport voice vlan 20 and set the access vlan to 20?  Or would I set this some other way?  Does "siwtchport voice vlan" do anything else behind the scenes (add headers, set QoS, etc)other than simply create an auxilary vlan for voice?

[Reza Sharifi]

If you just want to use the port for a phone (vlan 20), you can remove the data port

no switchport access vlan 10 

HTH

[mac1234]

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@Reza Sharifi wrote:

If you just want to use the port for a phone (vlan 20), you can remove the data port

no switchport access vlan 10 

HTH

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Ok. Easy enough. 

However, does "switchport voice vlan" do anything else other than create a separate VLAN for voice traffic?  Would simply using:

interface GigabitEthernet1/0/1
 switchport access vlan 20
 switchport mode access
 no mdix auto
 spanning-tree portfast
 spanning-tree guard root
end

and then manually assign the vlan id 20 on the phone accomplish the same thing as using switchport voice vlan?

[Reza Sharifi]

Well, the phone needs to be in voice vlan, because that vlan needs special options added like option 150 for TFTP.

HTH 

[Leo Laohoo]

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@mac1234 wrote:

no switchport access vlan <DATA VLAN>

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This means the data VLAN gets assigned to VLAN 1.  Is VLAN 1 enabled in the network?