Okay, it used by VTP to keep track of the vlan database. So you have one of your switches as a VTP server and the rest are VTP clients. Assuming the VTP revision number is 0.
You add a new vlan on the VTP server switch and save the config. When you do this the VTP revision number is then incremented by 1 on the VTP server switch.
This VTP server switch then sends out a VTP update message to the other switches and these switches then check their revision number against the one in the VTP update message. The revision number in the update is 1 and the clients VTP revision number is 0 so they know they have received a message with a more up to date vlan database. So they update their own vlan database info based on the VTP message.
Each time a vlan is created/deleted/modfied on the VTP server the revision number is incremented on the VTP server.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
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