VLAN Information

Unanswered Question
Jul 30th, 2007

Hi Experts,

If I'm using VTP , then i want to know from which switch my existing switch receive it's VLAN infromation.

I have this problem too.
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ankbhasi Tue, 07/31/2007 - 00:14

Hi Friend,

If you run "sh vtp status" in the last line you will see the ip address of the switch who had updated this VTP client switch.

Switch#sh vtp status

VTP Version : running VTP1 (VTP2 capable)

Configuration Revision : 0

Maximum VLANs supported locally : 1005

Number of existing VLANs : 22

VTP Operating Mode : Transparent

VTP Domain Name : NULL

VTP Pruning Mode : Disabled

VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0x07 0x0A 0xC2 0xEC 0x1D 0xEE 0xC8 0x1B

Configuration last modified by x.x.x.x at 0-0-00 00:00:00 <<<<<<------

HTH

Ankur

*Pls rate all helpfull post

alwahidi22 Tue, 07/31/2007 - 00:26

Thanx Friend ,

exactly what i want is the name of the switch who gives my existing switch it's VLAN not it's IP address.

BR ,

Ibrahim Alwahidi

Jon Marshall Tue, 07/31/2007 - 01:54

Hi

You can only get the name if you have an entry for the IP address in your DNS.

CDP would show you the name but you would have to be lucky enough to be on a switch that is connected to the root bridge.

Jon

alwahidi22 Tue, 07/31/2007 - 02:23

Hi Jon,

Thanx for your answer , assume that the existing switch connected directly to 2 switches and one of them is root bridge , so show cdp neighbors detail command will display the ID ( hostname ) for the connected switches and their's ip addresses not MAC address to trace the root bridge , so if the root bridge doesn't have an ip address????!!!

BR,

Ibrahim ALwahidi

Anand Narayana Tue, 07/31/2007 - 00:16

Hi Alwahidi,

YES u can find from which switch ur existing switch has got the vlan information, juz type " "show vtp status" in that last line showz the ip address from which it has got the vlan information. below is the output of my existing switch in my network

3750#sh vtp status

VTP Version : 2

Configuration Revision : 9

Maximum VLANs supported locally : 1005

Number of existing VLANs : 8

VTP Operating Mode : client

VTP Domain Name : NULL

VTP Pruning Mode : Enabled

VTP V2 Mode : Enabled

VTP Traps Generation : Disabled

MD5 digest : 0x13 0xE3 0x1E 0xB3 0x6B 0x2E 0x18 0xCB

Configuration last modified by 172.19.1.1 at 3-1-93 01:05:42

Local updater ID is 172.19.1.1 on interface Vl1 (lowest numbered VLAN interface

found)

i hope this helps. lemme know if anything else has to be clarified.

rajatsetia Tue, 07/31/2007 - 02:00

Hi Ibrahim,

you will not get the name of switch until unless you are using DNS

or If you are trying to figure out if this possible then I can suggest you one thing, if CDP is enabled :-

trace the mac-address of switch and use show cdp command set to check the out the hostname.

rgds

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