VTP Configuration Example

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Packet Tracer VTP Configuration

In this article, we will focus on how to configure VTP, with Packet Tracer. For VTP Configuration, we will use the topology below with two switches and two PCs.

 

VTP Example Topology

You can DOWNLOAD the Packet Tracer example with .pkt format HERE.

SwitchA> enable

SwitchA# configure terminal

SwitchA(config)# interface fa 0/24

SwitchA(config-if)#switchport trunk encapsulation dot1q

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

Firstly, let’s start with switch B and set switch B as vtp client mode.

SwitchB# configure terminal

SwitchB(config)# vtp mode client

SwitchB(config)# vtp domain cisco

SwitchB(config)# vtp password abc123

SwitchB(config)# vtp version 2

SwitchB(config)# vtp prunning enable

SwitchB(config)# end

Now, it is time to configure switch A. We will configure the same parameters for the Switch A except VTP Mode. Switch A will be in VTP Server Mode by default. But to show you, we will use “vtp server mode” command..

SwitchA(config)# vtp mode 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 cisco

SwitchA(config)# vtp password abc123

SwitchA(config)# vtp version 2

SwitchA(config)# vtp prunning enable

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

SwithA# 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 : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x12 0x34 0xBB 0x77 0x23 0xa4 0xA6 0x86
Configuration last modified by 0.0.0.0 at 4-6-23 07:15:24
Local updater ID is 0.0.0.0 (no valid interface found)

SwithB# show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 5
VTP Operating Mode : Client
VTP Domain Name : cisco
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x12 0x34 0xBB 0x77 0x23 0xa4 0xA6 0x86
Configuration last modified by 0.0.0.0 at 4-6-23 07:15:24
Local updater ID is 0.0.0.0 (no valid interface found)

SwitchA(config)# vlan 20

SwitchA(config)# vlan 30

SwitchA(config)# end

 

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

 

Show vlan brief on SwitchAAgain, when we check VLANs with the same command on Switch B, we will see the same VLANs on SwitchB:

 

Show vlan brief on SwitchBAfter this configuration, whenever we create, delete or modify a VLAN on Switch A, the same change will be done in Switch B too. Think about how a usefull function is it, especially during configuration of a large network with many switches!!!

Lastly, let ‘s use “show vtp status” command once more to check the status of vtp. Here, we will see that the total vlan number is 8 with additional 3 vlans.

 

Show vtp status on SwitchA

 

I hope this article will be helpfull for you…

 

You can DOWNLOAD the Packet Tracer example with .pkt format HERE.

You can download “Packet Tracer” in Tools section.

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