Jon Marshall Fri, 08/08/2008 - 04:53
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Do you mean the VTP revision number ?


Jon

Jon Marshall Fri, 08/08/2008 - 06:25
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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.


Jon



webstd.design Fri, 08/08/2008 - 07:06
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And how I can be sure, that VTP client willn't become VTP server?


What useful commands can I use?

Jon Marshall Fri, 08/08/2008 - 07:09
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It won't become the VTP server unless you make it the VTP server ie. you would need to make the change yourself


switch(config)# vtp mode server


"sh vtp status" will show you the status of the switch.


One other thing. When adding a new switch to your network always make sure the revision number is 0 and that you have set the switch to be a VTP client (or transparent).


To ensure the revision number is 0 on the switch change the vtp mode to transparent and then back to client mode.


Jon

webstd.design Fri, 08/08/2008 - 10:34
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As I understood, I cann't see revision number by

default with some command?

Jon Marshall Fri, 08/08/2008 - 11:23
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You can see the configuration revision number with the following commands -


IOS based switch = "sh vtp status"

CatOS based switch = "sh vtp domain"


Jon

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