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
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
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#
