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Tuesday, February 23, 2010

How to remove Vlan1 in exsisting production network?

We have a Vlan 1 is up on some of the switches in our production network. How do you 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.

Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

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