I installed a new 720 sup blade. I then brought the Config back into the unit. I now show no vlans when I do a show vlan command.
This is the VTP domain server. Did I forget to back something up? Is it something that Cisco Works may have backed up in the past?
Please help.. Router is crippled without the vlans. thx
The easiest way I find to do this is to pick one of your VTP clients and set it to server. Then bring your real VTP server back on-line as a client. It will learn all the VLAN info from the temporary server, and then when it is done you can switch it back to server and the other one back to client..
The best way to back up Vlan information while moving between hardware (like in your situation) is changing the VTP mode from "Server" to "Transparent".
In "Transparent" mode, the Vlan information is displayed in the running-config and such information can be captured along with the regular configuration.
Once you move to the new hardware, you can change back to VTP "Server" and a new vlan.dat will be created.
The only caveat is the revision number will be set back to 0, something to be aware if you are running multiple switches in your environment. Though, if you are running multiple switches in your environment, the Vlan information can be obtained from those switches after a hardware swap - no need to backup the Vlan.dat at all.