VTP Configuration with Packet Tracer

Packet Tracer VTP Configuration

In this lesson, we will focus on How to Configure VTP on Cisco switches with Packet Tracer. For VLAN Trunking Protocol, Cisco VTP Configuration, we will use the topology below with two switches and two PCs. Beside VTP Configuration, you can also check Cisco VLAN Configuration on Packet Tracer.

 

VTP Example Topology

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

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For all Packet Tracer Examples and Files, you can check Packet Tracer Labs Page.

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First of all we should 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# 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

 

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.

 

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VTP Client And VTP Server Configuration

In this step, we will configure Switch A as a VTP Server and the Switch B as a VTP Client. The default switch VTP mode is VTP Server, so we will not change anything on SwitchA. But in SwitchB we will change vtp mode. Then in both switches we will configure VTP domain, VTP password, vtp version and vtp prunning.

 

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

 

SwitchB> enable
SwitchB# configure terminal
SwitchB(config)# vtp mode client

 

Then, let’s change the default domain name from NULL to cisco.

SwitchB(config)# vtp domain cisco

After that, we will set vtp password as abc123, vtp version 2. And we will enable vtp prunning.
 

SwitchB(config)# vtp password abc123
SwitchB(config)# vtp version 2
SwitchB(config)# vtp prunning enable
SwitchB(config)# end

 

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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# 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 cisco
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

 

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.

 

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VTP Configuration Verification

To verify Cisco VTP Configuration, we will use “show vtp status” command on both switches.

 

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)

 

To test our configuration, lets create three additional VLANs on Switch A and then check Switch B 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 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 SwitchB

 

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.