How to reset VLAN Trunking Protocol (VTP) Revision Number on Cisco Switches

VLAN Trunk Protocol (VTP) reduces administration in a switched network and this will reduces the need to configure the same VLAN everywhere. When you configure a new VLAN on one VTP server, configuration revision number will increase by one and the VLAN is distributed through all switches in the domain. VTP revision number is a very crucial in Cisco’s VTP (VLAN Trunking Protocol). VTP Configuration revision number must be cleared to zero on new Switch before deploying in any Network for safety. However, there is no specific command to do this. Below I will explain few procedures to reset VTP Configuration revision number on Cisco Switches. VTP is a Cisco-proprietary protocol that is available on most of the Cisco Catalyst series products.

Steps to Reset the VTP Configuration Revision Number:

You can easily reset the VTP configuration revision number by either of the two procedures provided below.

1. Reset the Configuration Revision Number using Domain Name:

To reset VTP configuration revision number by changing the domain name string to another and revert the domain name configuration back. Complete these steps in order to reset the VTP configuration revision number with the change of the domain name:

a). Issue show vtp status command on Cisco Switch in order to check the VTP configuration revision number.

Cisco-Switch>enable
Cisco-Switch#show vtp status
VTP Version : 2

Configuration Revision : 6

Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : ciscoconsole.com
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x06 0xBA 0x4C 0xA5 0x98 0xCA 0x97 0x44
Configuration last modified by 0.0.0.0 at 3-1-93 01:28:36
b). Go to the global configuration mode and change the VTP domain name on Cisco Switch.

Cisco-Switch#configure terminal
Cisco-Switch(config)#vtp domain test.com

c). Again change the VTP domain name back to old domain name.

Cisco-Switch(config)#vtp domain ciscoconsole.com

d). Now check the VTP configuration revision number again with show vtp status command. It will be reset and changed to zero.

Cisco-Switch#show vtp status
VTP Version : 2

Configuration Revision : 0

Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : ciscoconsole.com
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x06 0xBA 0x4C 0xA5 0x98 0xCA 0x97 0x44
Configuration last modified by 0.0.0.0 at 3-1-93 01:28:36

2. Reset the Configuration Revision Number using VTP Mode:

Second is the fastest way to clear VTP configuration revision number, change the switch VTP mode to “Transparent Mode”, and then switch back.

Complete these steps in order to reset the configuration revision number with the change of the VTP mode:

a). Issue show vtp status command on Cisco Switch in order to check the VTP  configuration revision number.

Cisco-Switch>enable
Cisco-Switch#show vtp status
VTP Version : 2

Configuration Revision : 6

Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : ciscoconsole.com
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x06 0xBA 0x4C 0xA5 0x98 0xCA 0x97 0x44
Configuration last modified by 0.0.0.0 at 3-1-93 01:28:36

b). Go to the global configuration mode and change the VTP mode to ‘Transparent’ on Cisco Switch.

Cisco-Switch#configure terminal
Cisco-Switch(config)#vtp mode transparent

c). Again change the VTP mode from ‘Transparent’ to ‘Server’.

Cisco-Switch(config)#vtp mode server

d). Now check the VTP configuration revision number again with show vtp status command. It will be reset and changed to zero.

Cisco-Switch#show vtp status
VTP Version : 2

Configuration Revision : 0

Maximum VLANs supported locally : 255
Number of existing VLANs : 7
VTP Operating Mode : Server
VTP Domain Name : ciscoconsole.com
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x06 0xBA 0x4C 0xA5 0x98 0xCA 0x97 0x44
Configuration last modified by 0.0.0.0 at 3-1-93 01:28:36

 

Filed Under: VLAN/VTP

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  1. Prem says:

    I understand to reset VTP configuration revision number to zero on Cisco Switch. Thanks!

  2. Sai says:

    Very nice see this post! easy to reset VTP configuration revision number on Cisco Switch, Thanks for sharing.

  3. lilirouter says:

    Very nice see this post! easy to reset VTP configuration revision number on Cisco Switch, . Now I know more about Cisco Switch

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