Configuring VLANs and Trunking Topology

Addressing Table

Device	Interface	IP Address	Subnet Mask	Default Gateway
S1	VLAN 1	192.168.1.11	255.255.255.0	N/A
S2	VLAN 1	192.168.1.12	255.255.255.0	N/A
PC-A	NIC	192.168.10.3	255.255.255.0	192.168.10.1
PC-B	NIC	192.168.10.4	255.255.255.0	192.168.10.1
PC-C	NIC	192.168.20.3	255.255.255.0	192.168.20.1

Objectives

objectives

Part 1: Build the Network and Configure Basic Device Settings

Part 2: Create VLANs and Assign Switch Ports

Part 3: Maintain VLAN Port Assignments and the VLAN Database

Part 4: Configure an 802.1Q Trunk between the Switches

Part 5: Delete the VLAN Database

Background / Scenario

Modern switches use virtual local-area networks (VLANs) to improve network performance by separating large Layer 2 broadcast domains into smaller ones. VLANs can also be used as a security measure by controlling which hosts can communicate. In general, VLANs make it easier to design a network to support the goals of an organization.

VLAN trunks are used to span VLANs across multiple devices. Trunks allow the traffic from multiple VLANS to travel over a single link, while keeping the VLAN identification and segmentation intact.

In this lab, you will create VLANs on both switches in the topology, assign VLANs to switch access ports, verify that VLANs are working as expected, and then create a VLAN trunk between the two switches to allow hosts in the same VLAN to communicate through the trunk, regardless of which switch the host is actually attached to.

Note: The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs.

Note: Ensure that the switches have been erased and have no startup configurations. If you are unsure contact your instructor.

Required Resources

·         2 Switches (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable)

·         3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)

·         Console cables to configure the Cisco IOS devices via the console ports

·         Ethernet cables as shown in the topology

Part 1:     Build the Network and Configure Basic Device Settings

In Part 1, you will set up the network topology and configure basic settings on the PC hosts and switches.

Step 1:     Cable the network as shown in the topology.

Attach the devices as shown in the topology diagram, and cable as necessary.

Step 2:     Initialize and reload the switches as necessary.

Step 3:     Configure basic settings for each switch.

a.     Console into the switch and enter global configuration mode.

b.     Copy the following basic configuration and paste it to the running-configuration on the switch.

no ip domain-lookup

service password-encryption

enable secret class

banner motd #

Unauthorized access is strictly prohibited. #

line con 0

password cisco

login

logging synchronous

line vty 0 15

password cisco

logging synchronous

login

exit

a.     Configure the host name as shown in the topology.

b.     Configure the IP address listed in the Addressing Table for VLAN 1 on the switch.

c.     Administratively deactivate all unused ports on the switch.

d.     Copy the running configuration to the startup configuration.

Step 2:     Configure PC hosts.

Refer to the Addressing Table for PC host address information.

Step 3:     Test connectivity.

Verify that the PC hosts can ping one another.

Note: It may be necessary to disable the PCs firewall to ping between PCs.

Can PC-A ping PC-B?   yes

Can PC-A ping PC-C?   no  

Can PC-A ping S1?       no

Can PC-B ping PC-C?   no

Can PC-B ping S2?       no

Can PC-C ping S2?       no

Can S1 ping S2?           yes

If you answered no to any of the above questions, why were the pings unsuccessful?

The ones with no were pinging different subnets.

 

Part 2:     Create VLANs and Assign Switch Ports

In Part 2, you will create student, faculty, and management VLANs on both switches. You will then assign the VLANs to the appropriate interface. The show vlan command is used to verify your configuration settings.

Step 1:     Create VLANs on the switches.

a.     Create the VLANs on S1.

S1(config)# vlan 10

S1(config-vlan)# name Student

S1(config-vlan)# vlan 20

S1(config-vlan)# name Faculty

S1(config-vlan)# vlan 99

S1(config-vlan)# name Management

S1(config-vlan)# end

b.     Create the same VLANs on S2.

c.     Issue the show vlan command to view the list of VLANs on S1.

S1# show vlan

 

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4

                                                Fa0/5, Fa0/6, Fa0/7, Fa0/8

                                                Fa0/9, Fa0/10, Fa0/11, Fa0/12

                                                Fa0/13, Fa0/14, Fa0/15, Fa0/16

                                                Fa0/17, Fa0/18, Fa0/19, Fa0/20

                                                Fa0/21, Fa0/22, Fa0/23, Fa0/24

                                                Gi0/1, Gi0/2

10   Student                          active   

20   Faculty                          active   

99   Management                       active   

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

 

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1    enet  100001     1500  -      -      -        -    -        0      0  

10   enet  100010     1500  -      -      -        -    -        0      0  

20   enet  100020     1500  -      -      -        -    -        0      0  

99   enet  100099     1500  -      -      -        -    -        0      0  

         

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1002 fddi  101002     1500  -      -      -        -    -        0      0  

1003 tr    101003     1500  -      -      -        -    -        0      0  

1004 fdnet 101004     1500  -      -      -        ieee -        0      0  

1005 trnet 101005     1500  -      -      -        ibm  -        0      0  

 

Remote SPAN VLANs

------------------------------------------------------------------------------

 

 

Primary Secondary Type              Ports

------- --------- ----------------- ------------------------------------------

What is the default VLAN? 1

What ports are assigned to the default VLAN? all port.

Step 2:     Assign VLANs to the correct switch interfaces.

a.     Assign VLANs to the interfaces on S1.

1)    Assign PC-A to the Student VLAN.

S1(config)# interface f0/6

S1(config-if)# switchport mode access

S1(config-if)# switchport access vlan 10

2)    Move the switch IP address VLAN 99.

S1(config)# interface vlan 1

S1(config-if)# no ip address

S1(config-if)# interface vlan 99

S1(config-if)# ip address 192.168.1.11 255.255.255.0

S1(config-if)# end

b.     Issue the show vlan brief command and verify that the VLANs are assigned to the correct interfaces.

S1# show vlan brief

 

VLAN Name                             Status    Ports

---- -------------------------------- --------- -------------------------------

1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4

                                                Fa0/5, Fa0/7, Fa0/8, Fa0/9

                                                Fa0/10, Fa0/11, Fa0/12, Fa0/13

                                                Fa0/14, Fa0/15, Fa0/16, Fa0/17

                                                Fa0/18, Fa0/19, Fa0/20, Fa0/21

                                                Fa0/22, Fa0/23, Fa0/24, Gi0/1

                                                Gi0/2

10   Student                          active    Fa0/6

20   Faculty                          active   

99   Management                       active   

1002 fddi-default                     act/unsup

1003 token-ring-default               act/unsup

1004 fddinet-default                  act/unsup

1005 trnet-default                    act/unsup

c.     Issue the show ip interface brief command.

What is the status of VLAN 99? Why?

Active, administratively up, protocol down. Because no ports have been assigned.

d.     Use the Topology to assign VLANs to the appropriate ports on S2.

a.     Remove the IP address for VLAN 1 on S2.