VTP Configuration on Packet Tracer

  To configure VTP we will use two swithes and two PCs for each swithes given below:

        First of all we must configure the trunk between swithes. Because VTP information pass through only on trunk links on management VLAN (VLAN 1). To do this:

        SwitchA# enable
        SwitchA(config)# interface fa 0/24
        SwitchA(config-if)# switchport mode trunk
        %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to down
        %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/24, changed state to up
        SwitchA(config-if)# end

       Now the trunk is activated. For switchport mode trunk command it is not necessary to use the same command at the other side of the link, without this job it is automatically activated.

       After that we configure ServerA as a VTP Server and the Server B as a VTP Client. The default switch VTP mode is VTP Server, so we did not change anything on SwitchA. But in SwitchB we will change vtp mode. Then in both switches we will confiugreVTP domain, VTP password, vtp version and vtp prunning. The related configuration for both switches are below:

        SwitchB# enable
        SwitchB(config)# vtp mode client
        Setting device to VTP CLIENT mode.
        SwitchB(config)# vtp domain cisco
        Changing VTP domain name from NULL to cisco
        SwitchB(config)# vtp password abc123
        SwitchB(config)# vtp version 2
        SwitchB(config)# vtp prunning enable
        SwitchB(config)# end

       To verify use “show vtp status” and the screenshot will be like below:

       We will configure the same parameters for the switchA except VTP mode.

       SwitchA# enable 
       SwitchA(config)# vtp mode server
       Device mode already VTP SERVER.
       SwitchA(config)# vtp domain ciscoo
       Changing VTP domain name from NULL to ciscoo

       04:50:49 %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa0/24 because of VTP domain mismatch.

       SwitchA(config)# vtp domain ciscoo
       Changing VTP domain name from ciscoo to cisco
       SwitchA(config)# vtp password abc123
       SwitchA(config)# vtp version 2
       SwitchA(config)# vtp prunning enable
       SwitchA(config)# end

       Above, during VTP domain configuration an error occur because of the domain missmatch and after that when we corrected the configuration then the error dissappeared.

       To verify use “show vtp status” and the screenshot will be like below:

       To test our configuration lets create three additional VLANs on SwitchA and then check switchB if the same VLANs created under it too.To do this:

       SwitchA(config)# vlan 10
       SwitchA(config)# vlan 20
       SwitchA(config)# vlan 30
       SwitchA(config)# end

       When we use “show vlan brief” command on SwitchA we will see the created VLANs like below:

       Again, when we check VLANs with the same command we will see the same VLANs:

       After this configuration, whenever we create, delete or modify a VLAN on SwitchA, the same change will be done in SwitchB too. Think about how a usefull function is it during configuration a large network with many switches!!! I hope this article will be helpfull for you…