Each
time a VTP server modi?¬?es its VLAN information, the VTP server increments the
con?¬?guration revision number by one. The server then sends a VTP advertisement with the
new con?¬?guration revision number. If the con?¬?guration revision number being advertised
is higher than the number stored on the other switches in the VTP domain, the switches
overwrite their VLAN con?¬?gurations with the new information being advertised.
The con?¬?guration revision number in VTP transparent mode is always zero.
A device that receives VTP advertisements must check various parameters before
incorporating the received VLAN information. First, the management domain name and
password in the advertisement must match those con?¬?gured in the local switch. Next, if the
con?¬?guration revision number indicates that the message was created after the
con?¬?guration currently in use, the switch incorporates the advertised VLAN information.
To reset the con?¬?guration revision number on some Cisco Catalyst switches, you can
change the VTP domain to another name and then change it back. You can also change the
VTP mode to transparent and then change it back to client or server.
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