Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

How do remove Vlan1 in exsisting production network?

Hi,

In our production network,Vlan 1 is up on some of the switches.How to remove vlan1 without impact in production?

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: How do remove Vlan1 in exsisting production network?

kandanarumugam wrote:

Hi,

In our production network,Vlan 1 is up on some of the switches.How to remove vlan1 without impact in production?

You can't actually stop vlan 1 sending CDP/PaGP/VTP etc. across trunk links but what you can do is -

1) create a vlan eg. vlan 999 to put all ports that are unused into. There is no need to create a L3 SVI for vlan 999 because it is only for unused ports

2) change the native vlan from vlan 1 to another vlan. Again this vlan does not need a L3 SVI because the native vlan does not need to be routed

3) If you are using vlan 1 to manage your switches you need to create a new vlan for that and shutdown vlan 1 interface on each switch and add a L3 SVI for the new vlan. You will need to be at the console for this otherwise you could lose connectivity

If you have any user ports in vlan 1 then you will need to reallocate these into different vlans.

Once you have done all that vlan 1 will only be used for Cisco L2 managements protocols - CDP/PaGP/VTP etc.

Jon

2 REPLIES
Hall of Fame Super Blue

Re: How do remove Vlan1 in exsisting production network?

kandanarumugam wrote:

Hi,

In our production network,Vlan 1 is up on some of the switches.How to remove vlan1 without impact in production?

You can't actually stop vlan 1 sending CDP/PaGP/VTP etc. across trunk links but what you can do is -

1) create a vlan eg. vlan 999 to put all ports that are unused into. There is no need to create a L3 SVI for vlan 999 because it is only for unused ports

2) change the native vlan from vlan 1 to another vlan. Again this vlan does not need a L3 SVI because the native vlan does not need to be routed

3) If you are using vlan 1 to manage your switches you need to create a new vlan for that and shutdown vlan 1 interface on each switch and add a L3 SVI for the new vlan. You will need to be at the console for this otherwise you could lose connectivity

If you have any user ports in vlan 1 then you will need to reallocate these into different vlans.

Once you have done all that vlan 1 will only be used for Cisco L2 managements protocols - CDP/PaGP/VTP etc.

Jon

New Member

Re: How do remove Vlan1 in exsisting production network?

Hi Jon,

I agree your points,But my switches are placed in remote location.I don't have option to connect through console and many of the production servers connected to that switch.Is it possible to remove the vlan1 without down time?

Thanks,

Kandan

6381
Views
0
Helpful
2
Replies