Packet Tracer – Troubleshoot VTP and DTP (Instructor Version)
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Topology
Addressing Table
Objectives
- Part 1: Troubleshoot DTP
- Part 2: Troubleshoot VTP
Background / Scenario
In this activity, the switches S2 and S3 are not implementing VTP information. You will verify that DTP and VTP configurations are correctly implemented. When all the issues are resolved, the PCs in the same VLAN will be able to communicate with each other.
Part 1: Troubleshoot DTP
In Part 1, you will troubleshoot the trunk links among the switches. You will verify that permanent trunk links are used between the switches.
a. Enter show interfaces trunk at the privileged EXEC prompt on all the switches to determine the status of the trunk links. How many trunk links are configured currently?
There are no working trunk links between the switches.
b. Enter show interfaces g0/1 switchport at the privileged EXEC prompt on S1. Do the same for g0/2 interface on S1.
What is the operational mode on the GigabitEthernet interfaces on S1?
Static access
c. Repeat the commands for g0/1 on S2 and g0/2 on S3.
Correct the trunk links. Record the commands you used to correct the trunking issue.
S1(config)# interface range g0/1 - 2 S1(config-if-range)# switchport mode trunk S2(config)# interface g0/1 S2(config-if)# switchport mode trunk S3(config)# interface g0/2 S3(config-if)# switchport mode trunk
d. Verify the trunk links using the show commands.
Part 2: Troubleshoot VTP
S1 will be configured as the VTP server. S2 and S3 will be configured as VTP clients, and will be receiving VTP updates from S1. The VTP domain should be CCNA and the VTP password should be cisco. Currently all the desired VLANs are already configured on S1.
Step 1: Verify VLAN information
Use the show vlan brief command on all the switches. Do all the switches have the same number of VLANs? How many does each switch have?
No. S1 has 10 VLANs. The other two switches have only 7 VLANs each.
Step 2: Verify VTP configurations.
Use the show vtp status and show vtp password commands on all the switches to verify the VTP status.
Record the VTP status information in the table below.
Step 3: Correct the VTP configurations.
Ensure that switch S1 is operating as the VTP server. S2 and S3 should be VTP clients, and receiving VTP updates from S1. The VTP domain should be CCNA and the VTP password should be cisco. The desired VLANs are already configured on switch S1
Record the commands used to correct the VTP configurations.
S1(config)# vtp mode server S1(config)# vtp domain CCNA S1(config)# vtp password cisco S2(config)# vtp mode client S2(config)# vtp domain CCNA S2(config)# vtp password cisco S3(config)# vtp mode client S3(config)# vtp password cisco
Step 4: Verify port assignment.
The switchports connecting to the PCs need to be configured in the correct VLANs so the PCs can communicate with each other.
Use the show vlan brief command on S2 and S3 to determine if VLANs have been assigned to the switchports. Which VLAN is associated with these switchports?
1
Using the table above, correct the VLAN assignments on S2 and S3. Record the VLAN assignment configurations below.
S2(config)# interface f0/1 S2(config-if)# switchport access vlan 10 S2(config-if)# interface f0/9 S2(config-if)# switchport access vlan 20 S2(config-if)# interface f0/17 S2(config-if)# switchport access vlan 30 S3(config)# interface f0/8 S3(config-if)# switchport access vlan 10 S3(config-if)# interface f0/16 S3(config-if)# switchport access vlan 20 S3(config-if)# interface f0/24 S2(config-if)# switchport access vlan 30
Step 5: Verify end to end connectivity.
a. From PC0 ping PC5.
b. From PC1 ping PC4.
c. From PC2 ping PC3.
Script
Switch S1
enable config t vtp mode server vtp domain CCNA vtp password cisco interface range g0/1 - 2 switchport mode trunk end
Switch S2
enable config t vtp mode client vtp domain CCNA vtp password cisco interface g0/1 switchport mode trunk interface f0/1 switchport access vlan 10 interface f0/9 switchport access vlan 20 interface f0/17 switchport access vlan 30 end
Switch S3
enable config t vtp mode client vtp domain CCNA vtp password cisco interface g0/2 switchport mode trunk interface f0/8 switchport access vlan 10 interface f0/16 switchport access vlan 20 interface f0/24 switchport access vlan 30 end
