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I believe only way to configure VTP domain is by CLI., Anyway i heard when we configure trunk from a switch A(which is in VTP domain (say cisco)) to another switch B which dont belong to any VTP domain., the second switch automatically assigned to switch A (VTP domain)., is that so ? i cant find anywhere this.,

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2 Answers 2

This is correct!

When Cisco implemented VTP, they left a "null" value for exactly this reason. If a VTP client or server with a null domain receives a VTP message with the domain populated, it will assume the domain of the received message and add applicable VLANs to its database.

You can find more information here:

Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide - Configuring VTP

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Its true. The 2nd switch will be assigned the domain from 1st switch.

A quick test to prove it.

Quick output: running-configs do not have the vtp configurations.

!
Switch#show run
Building configuration...
.
.
.
hostname Switch
!
!
!
!
spanning-tree mode pvst
!
interface FastEthernet0/1
!
.
.
.
!
interface Vlan1
 no ip address
 shutdown
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
end


Switch#show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Server
***VTP Domain Name                 : HK***
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0xC2 0x79 0x35 0xAE 0x48 0x96 0xB9 0xE0 
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)
Switch#
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