Changing Default Native VLAN

[rameshbalachandran]

Hi,

     We are using CISCO 3750-G Switch as Core Switch. VLAN1 is being our Native VLAN since the implementation.

This switch is connected with 10 numbers of CISCO 2960 Switches by trunking ports. IP addresses assigned for L2 Switches from VLAN1 only.

Now I want to change the Default Native VLAN from 1 to some other.

My query is is there any pre-requesties to change Native VLAN or Can I change to Native VLAN ID simply?

Looking forward support.

Regards,

Ramesh Balachandran

[Karthick Murugan · Accepted solution]

HI Ramesh,

Native VLAN will come into picture if you use trunks in your switches. Procedure to change the native VLAN.

1) conf ter

    interface

    switchport trunk native vlan

CAUTION: If you are chaning the native VLAN only one end the spanning-tree for the orginal native vlan and the changed native vlan will go into inconsistency state and will be blocked.

In the below example on the local end(Native VLAN chosen is 2 and the remote end is 1)

3750#sh spanning-tree int gi1/8

Vlan                Role Sts Cost      Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

VLAN0001            Desg BKN*4         128.8    P2p *PVID_Inc

VLAN0002            Desg BKN*4         128.8    P2p *PVID_Inc

Thanks & Regards,
Karthick Murugan
CCIE#39285

[rameshbalachandran]

Thanks a lot.

It seems i have to change Default VLAN through console on each switches.