VTP senario

Answered Question
Sep 6th, 2010

Hi All,

Here is a brief topology and a question.

                                  switch A ------------------> switch  B ------------------> switch C.

=========================================================

vtp mode              |      server                |         client                   |         server

=========================================================

revision number     |          1                  |            1                       |            1

=========================================================

If the connection between switch A and switch B is down , switch C would act as the server after a couple of days switch C goes down and switch A comes online. In this senario how would the switch communicate ??? would the vlan information send from server be accepted by the client or not?

I have this problem too.
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Correct Answer by Chetan Kumar Ress about 6 years 3 months ago

Hi,

Client Can update Server VTP domain when it is having higher revision number.

Please refer the Link : http://www.cisco.com/warp/public/473/vtp_flash/

In above link  you will get your answer.

The truth is that a client can update a server if it's revision number is higher. The difference between the client and server remains that a client cannot edit the vlan.dat database, nor can it change VTP data, such as domain name.

Remember that all data, apart from the revision number, must match between two switches for an update to the VLAN database to occur between them.

Regards

Chetan Kumar

http://chetanress.blogspot.com

Correct Answer by Jon Marshall about 6 years 3 months ago

podhillo wrote:

Hi All,

Here is a brief topology and a question.

                                  switch A ------------------> switch  B ------------------> switch C.

=========================================================

vtp mode              |      server                |         client                   |         server

=========================================================

revision number     |          1                  |            1                       |            1

=========================================================

If the connection between switch A and switch B is down , switch C would act as the server after a couple of days switch C goes down and switch A comes online. In this senario how would the switch communicate ??? would the vlan information send from server be accepted by the client or not?

Assuming the VTP domain/passwords are the same, yes the client would accept updates from either server. If A -> B went down then you could make any changes on C and these would be propogated to B. If 3 days later  C went down and A came up B would have a higher revision number and so would update A with the new vlan database. Note there is nothing to stop a client updating a VTP server if it has a higher revision number.

This may or may not be what you want.

Jon

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Correct Answer
Jon Marshall Mon, 09/06/2010 - 05:59

podhillo wrote:

Hi All,

Here is a brief topology and a question.

                                  switch A ------------------> switch  B ------------------> switch C.

=========================================================

vtp mode              |      server                |         client                   |         server

=========================================================

revision number     |          1                  |            1                       |            1

=========================================================

If the connection between switch A and switch B is down , switch C would act as the server after a couple of days switch C goes down and switch A comes online. In this senario how would the switch communicate ??? would the vlan information send from server be accepted by the client or not?

Assuming the VTP domain/passwords are the same, yes the client would accept updates from either server. If A -> B went down then you could make any changes on C and these would be propogated to B. If 3 days later  C went down and A came up B would have a higher revision number and so would update A with the new vlan database. Note there is nothing to stop a client updating a VTP server if it has a higher revision number.

This may or may not be what you want.

Jon

Correct Answer
Chetan Kumar Ress Mon, 09/06/2010 - 06:06

Hi,

Client Can update Server VTP domain when it is having higher revision number.

Please refer the Link : http://www.cisco.com/warp/public/473/vtp_flash/

In above link  you will get your answer.

The truth is that a client can update a server if it's revision number is higher. The difference between the client and server remains that a client cannot edit the vlan.dat database, nor can it change VTP data, such as domain name.

Remember that all data, apart from the revision number, must match between two switches for an update to the VLAN database to occur between them.

Regards

Chetan Kumar

http://chetanress.blogspot.com

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