Lab 3.5.3: Troubleshooting VLAN Configurations

Topology Diagram

Addressing Table

                                              Device

                                            (Hostname)

                                             Interface

                                            IP Address


                                            Subnet Mask

                                          Default Gateway

                                                S1

                                              VLAN 56

                                           192.168.56.11

                                           255.255.255.0

                                                N/A

                                                S2

                                              VLAN 56

                                           192.168.56.12

                                           255.255.255.0

                                                N/A

                                                S3

                                              VLAN 56

                                           192.168.56.13

                                           255.255.255.0

                                                N/A

                                                PC1

                                                NIC

                                           192.168.10.21

                                           255.255.255.0

                                           192.168.10.1

                                                PC2

                                                NIC

                                           192.168.20.22

                                           255.255.255.0

                                           192.168.20.1

                                                PC3

                                                NIC

                                           192.168.30.23

                                           255.255.255.0

                                           192.168.30.1

                                                PC4

                                                NIC

                                           192.168.10.24

                                           255.255.255.0

                                           192.168.10.1

                                                PC5

                                                NIC

                                           192.168.20.25

                                           255.255.255.0

                                           192.168.20.1

                                                PC6

                                                NIC

                                           192.168.30.26

                                           255.255.255.0

                                           192.168.30.1

Initial Port Assignments (Switches 2 and 3)

Ports

                                                         Assignment

                                                                                                    Network

Fa0/1 – 0/5

             802.1q Trunks (Native VLAN 56)

                                                      192.168.56.0 /24

Fa0/6 – 0/10

             VLAN 30 – Guest (Default)

                                                      192.168.30.0 /24

Fa0/11 – 0/17

             VLAN 10 – Faculty/Staff

                                                      192.168.10.0 /24

Fa0/18 – 0/24

             VLAN 20 – Students

                                                      192.168.20.0 /24

Learning Objective

Practice basic VLAN troubleshooting skills.

Scenario

In this lab, you will practice troubleshooting a misconfigured VLAN environment. Load or have your
instructor load the configurations below into your lab gear. Your objective is to locate and
correct any and all errors in the configurations and establish end-to-end connectivity. Your final
configuration should match the topology diagram and addressing table. All passwords are set to
cisco, except the enable secret password, which is set to class.

Task 1: Prepare the Network

Step 1: Cable a network that is similar to the one in the topology diagram.

Step 2: Clear any existing configurations on the switches, and initialize all ports in the shutdown
state.

Step 3: Import the configurations below.

Switch 1

hostname S1

no ip domain-lookup

enable secret class

!

!

interface range FastEthernet0/1-5

 switchport mode trunk

!

interface range FastEthernet0/6-24

 shutdown

!

interface Vlan1

 no ip address

 no ip route-cache

!

interface Vlan56

 ip address 192.168.56.11 255.255.255.0

 no ip route-cache

!

line con 0

 logging synchronous

line vty 0 4

 no login

line vty 5 15

 password cisco

 login

!

end


Switch 2

hostname S2

no ip domain-lookup

enable secret class

!

vlan 10,20,30,56

!

interface range FastEthernet0/1-5

 switchport trunk native vlan 56

 switchport mode access

!

interface range FastEthernet0/6-10

 switchport access vlan 30

 switchport mode access

!

interface range FastEthernet0/11-17

 switchport access vlan 10

 switchport mode access

!

interface range FastEthernet0/18-24

 switchport access vlan 20

 switchport mode access

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

 ip address 192.168.56.12 255.255.255.0

 no ip route-cache

 shutdown

!

line con 0

 password cisco

 login

line vty 0 4

 password cisco

 login

line vty 5 15

 password cisco

 login

!

end



Switch 3

hostname S3

no ip domain-lookup

enable secret class

!

vlan 10,20,30

!

interface range FastEthernet0/1-5

 switchport trunk native vlan 56

 switchport mode trunk

!

interface range FastEthernet0/6-10

 switchport mode access

!

interface range FastEthernet0/11-17

 switchport mode access

!

interface range FastEthernet0/18-24

 switchport mode access

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface Vlan1

 no ip address

 no ip route-cache

 shutdown

!

interface Vlan56

 no ip route-cache

!

line con 0

 password cisco

 login

line vty 0 4

 password cisco

 login

line vty 5 15

 password cisco

 login

!

end

Task 2: Troubleshoot and Repair the VLAN Configuration

Task 3: Document the Switch Configurations

On each switch, capture the running configuration to a text file and save for future reference:

Task 4: Clean Up

Erase the configurations and reload the switches. Disconnect and store the cabling. For PC hosts
that are normally connected to other networks (such as the school LAN or to the Internet),
reconnect the appropriate cabling and restore the TCP/IP settings.