native vlans and ip phones

Unanswered Question
Jul 12th, 2007
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I have Avaya IP phones connected to Cisco 3750 switches and the PCs are connected to the switch via the access port of the phones.

I need to configure a native vlan on the access switch in order to allow the PCs to work :

switchport trunk native vlan 2

switchport trunk allowed vlan 2,3

switchport mode trunk

switchport voice vlan 3

The questions I have are:

1. Can more than 1 native vlan be configured on a switch ?

2. Is native vlan port based or switch based ?

Any help appreciated.



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mahmoodmkl Thu, 07/12/2007 - 01:49
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I think u dnot need to configure native vlan on the switch.if u have seprate vlans from voice and data then u can just define them on the switchport.

u cannot configure more than one native vlan i think.

the native vlan is port based not switch based.

u can configure the port as below.

switchport mode access

switchport acces vlan vlanid

switchport voice vlan vlanid



Martin Parry Thu, 07/12/2007 - 03:07
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I am not over familiar with how Avaya phones work, but I am not sure that the "switchport voice vlan " command will work.

This command works with Cisco phones because the switch uses cdp to recognise that a phone is attached and then knows that the voice vlan is required for that device. I don't think that the Avaya phones will support cdp, and thus this command may not work.

With regards to the native vlans, they are entirely port based, and you could have all ports on the switch with a different native vlan if required.



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