Trunk Port Configuration Lab

In this lab, VLANs were configured on two Cisco 2960 switches, access ports were assigned to the appropriate VLANs, and a trunk link was established between the switches to allow inter-switch VLAN communication. Multiple PCs were connected across both switches, VLAN assignments were verified, and connectivity tests confirmed that devices within the same VLAN can communicate across switches, while devices in different VLANs remain isolated.

Network Setup Overview

Core device: Cisco 2960 Switch
Note: Switch-to-switch connection uses a crossover cable.

Configuration Steps

1. Create VLANs on Both Switches

Switch(config)# vlan 10
Switch(config-vlan)# name SALES

Switch(config)# vlan 20
Switch(config-vlan)# name ENGINEERING

2. Assign Access Ports to VLANs

Switch(config)# interface fa0/1
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 10

Switch(config)# interface fa0/2
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 10

Switch(config)# interface range fa0/3 - 4
Switch(config-if-range)# switchport mode access
Switch(config-if-range)# switchport access vlan 20

3. Disable Unused Ports

Switch(config)# interface range fa0/5 - 24
Switch(config-if-range)# description Inactive ports
Switch(config-if-range)# shutdown

Switch(config)# interface range g0/1 - 2
Switch(config-if-range)# shutdown

Verification

1. Display VLAN Assignment

Switch# show vlan brief

Sample Output:

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/5-Fa0/24, Gig0/1, Gig0/2
10   SALES                            active    Fa0/1, Fa0/2
20   ENGINEERING                      active    Fa0/3, Fa0/4
1002 fddi-default                     active
1003 token-ring-default               active
1004 fddinet-default                  active
1005 trnet-default                    active

Trunk Configuration Between Switches

The two switches are connected using GigabitEthernet0/1 interfaces. Trunking allows VLAN 10 and VLAN 20 to pass traffic between the switches.

Configuration on Both Switches

Switch(config)# interface gig0/1
Switch(config-if)# switchport mode trunk
Switch(config-if)# switchport trunk native vlan 199
Switch(config-if)# switchport trunk allowed vlan 10,20
Switch(config-if)# no shut

Connectivity Testing

Test 1: PC1 to PC4 (VLAN 10)

Expected: Success
Reason: Both devices are in VLAN 10, on different switches, connected through a trunk.

Test 2: PC2 to PC7 (VLAN 20)

Expected: Success
Reason: Same VLAN across switches, trunk allows communication.

Test 3: PC2 to PC4 (VLAN 20 to VLAN 10)

Expected: Failure
Reason: Inter-VLAN communication requires a Layer 3 device.

Ping Test Summary

Conclusion

• VLANs are correctly configured and properly segment the network.

• Trunking between switches is functioning and allows multi-VLAN traffic.

• Access ports are assigned correctly.

• Unused ports were shut down for security.

• Connectivity tests confirm both VLAN separation and trunk functionality.