Interface Config for ONLY voice vlan?

mac1234 · ‎09-07-2018

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 · ‎09-07-2018

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 · ‎09-07-2018

@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

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 · ‎09-07-2018

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

HTH

Leo Laohoo · ‎09-07-2018

@mac1234 wrote:

no switchport access vlan <DATA VLAN>

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