This is a static archive of our old Q&A Site. Please post any new questions and answers at ask.wireshark.org.

Why VTP version is different in cisco configuration and wireshark capture in scenario on GNS3??

0

ESW16 VTP configuration: alt text

ESW4 VTP configuration: alt text

WireShark capture on the link between switches:

alt text

asked 20 Sep '15, 06:40

MehranBazgir's gravatar image

MehranBazgir
21559
accept rate: 0%


One Answer:

3

You are using version 1. The "VTP Version" statement in that show command only says what the switch is capable of, meanwhile you can see in the "V2 Mode" statement that it is disabled. Since it is only capable of versions 1 or 2, and version 2 is disabled, you are using version 1.

answered 20 Sep '15, 09:18

Quadratic's gravatar image

Quadratic
1.9k6928
accept rate: 13%

Thanks, but enabling the VTP version 2 had no effect on the capture result.

(21 Sep '15, 05:29) MehranBazgir

Thank you Quadratic. I modified my configuration and set the VTP version to 2, but the result of capturing was the same as the previous.

ESW16 new VTP configuration:

alt text

ESW4 new VTP configuration:

alt text

WireShark capture on the link between switches:

alt text

(21 Sep '15, 05:29) MehranBazgir
1

Do the summary advertisements show version 1? I suspect not. :)

I'm being coy, but there's no difference between a join message in one version or the other. If you're running version 2, you should see it in the summary advertisements though. So, the message is a version 1 message basically. I just double-checked my memory with a real switch and confirmed this - the summaries should be V2, joins are advertised V1.

(21 Sep '15, 21:20) Quadratic

Thank you very much, I got it. :)

(22 Sep '15, 01:24) MehranBazgir