I know that if we insert a switch with high VTP revision number in the network it may wipe out the existing vtp information.In this case how can we bring back all the information and the network to stable without much delay.
Be very careful when adding the new switch so the info doesn't get over written and write down your vlan info just in case. Before plugging it in, default the vtp revision on new switch or if it is not a core switch maybe set vtp mode to transparent.
Maybe even make a few small non-network effecting changes to the vtp server so it's revision number is increased higher than that of the new switch your adding.
Remember, even a switch in vtp client mode can wipe out vtp info in the network if it's revision number is highest.
I don't know of a way to recover VTP info, other then manually configuring vlan info across the network again. Unless, you have some switch with the info still you can make into a vtp server and maybe get the info repropagted before it gets zapped itself.
Keep in mind, some switches keep a seperate vlan database so restoring a old running config from backup may not recover the vlan info.
Use a vtp password if possible on your network and "always" default the any switch that needs to be configured and reinstalled on the network and verify the vtp revision number sits at 0 before installing . We haven't tried it but it may be possible to back up the vlan.dat file for the servers .
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