VTP Configuration Steps

Configuring VTP is very simple. However, please remember that VTP assumes that the switches are connected to each other by trunks. First, make sure that the switches are connected by trunk links. After that, there are two steps to configure.

  1. Configure VTP domain
  2. Configure VTP mode

Then, if necessary, configure VTP pruning to stop unnecessary flooding on the trunk.

Trunk configuration is explained in the following article.

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VLANの設定の流れまず、全体的な設定の流れを確認しましょう。デフォルトでは、スイッチにはVLAN1が存在します。すべてのポートはCatalystのモデルに応じて、特定のDTPモードになっています。Catalyst3560/3750では、Dynamic autoのモードです。そのため、Catalystスイッチが接続されない場合は、すべてのポートはアクセスポートとして動作します。アクセスポートとして動作する場合のVLANメンバーシップはVLAN1です。ここから必要に応じて、新しくVLANを作成したり、DTPモードを変更したりしてアクセスポート/トランクポートとして動...

Configure VTP domain

Please note the following points regarding the configuration of VTP domain names.

  • distinguish between uppercase and lowercase letters
  • Once configured, it can be changed, but cannot be deleted.
  • Not configured by default.

To configure the VTP domain name, use the following command.Configure VTP domain

Switch(config)# vtp domain <domain-name>

<domain-name> :VTP domain name

Note that the VTP domain name is advertised by CDP, and switches without a VTP domain will automatically reflect the VTP domain name advertised by CDP. You can also set the VTP password if necessary, using the following commandConfigure VTP password

Switch(config)# vtp password <password>

<password> : VTP password

If you have configured a VTP password, it must, of course, be a common password for all switches.

Configure VTP mode

To configure the VTP mode, use the following command.Configure VTP mode

Switch(config)# vtp mode { server | client | transparent }

Default VTP mode is server. Specify other modes as needed.

Configure VTP pruning

To enable VTP pruning, use the following command on any of the switches in the VTP domain in server mode.Enable VTP pruning

Switch(config)# vtp pruning

Verify VTP configuration

To verify VTP configuration, use the following command.

  • show vtp status
  • show vtp password

The show vtp status command allows you to see all the information such as VTP domain name, VTP mode, configuration revision number, pruning enable/disable, etc. The show vtp password command allows you to see the VTP password.

show vtp status

The following are the results displayed by the show vtp status command.

SW1#show vtp status
VTP Version                     : 2
Configuration Revision          : 7
Maximum VLANs supported locally : 16
Number of existing VLANs        : 8
VTP Operating Mode              : Server
VTP Domain Name                 : SWITCH
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x19 0xA4 0x01 0x0F 0x47 0xC9 0x5F 0xF6
Configuration last modified by 0.0.0.0 at 3-9-93 05:18:28
Local updater ID is 0.0.0.0 (no valid interface found)

From the above display result of the show vtp status command, you can see that this switch has configuration revision number 7, VTP mode is server mode, VTP domain name is SWITCH, and VTP pruning is disabled. In addition, the “MD5 digest” in the above display result represents the checksum of the VTP advertisement.

show vtp password

The following is an example of output from show vtp password.

SW1#show vtp password
VTP Password: abcde


From the above, you can see that the VTP password is set to “abcde”.

VLAN(Virtual LAN)