VTP

• VTP or Virtual Trunking Protocol basically revises vlans on all the client switches once a change is made on server switch.

• It works over trunk links.• VTP makes the revision by 1 when a change in vlan is made.• The client switches loses all their vlans, but all the vlan on server are

replicated on clients (i.e switches in client mode).• To work properly VTP must have same VTP domain.• VTP is good if we have to configure number of switches with same

vlans.

VTP

VTP Modes:SERVER:This mode is set by default on switches.It can change Vlan information on Client switchesIt Sends & Receives VTP updates.It saves Vlan Database Configuration.CLIENT:It cannot change Vlan informationIt Sends & Receives VTP updates.It does not save Vlan configuration.Transparent: They forward VTP updatesIt does not listen to VTP AdvertisementsIt Saves Vlan Configuration.

VTP

• VTP PRUNING:• It is used to make sure that unnecessary broadcast traffic is not sent

over trunk links. The vlans will go but traffic will not.• It only works on VTP servers.

• Configuration of VTP:• Verify VTP:• Switch(config)# show vtp status • Check the configuration revision:• “0” Revision means never received a revision so its not dangerous.• Mode Server is Server• Domain name “ its null by default or blank”

VTP

• VTP Domain Configuration:• Switch(config)# vtp domain <domain-name> • Now show vtp status and we can see the domain.• Switch(config)# vtp password [To setup password for vtp domain]• Change VTP mode from server to client:• Switch(config)# vtp mode client • Change VTP version:• By default it is disabled.• Switch(config)# vtp version 2