Switch Trunk and Access Ports for Router-on-a-Stick

Bundle lab · $29.99

Configure the Layer-2 switch side of a router-on-a-stick design. A single IOS router already provides inter-VLAN routing on Ethernet0/0.10 (10.0.10.1/24) and Ethernet0/0.20 (10.0.20.1/24). Bring up VLAN transport by creating VLANs on the switch, assigning host access ports, and converting the router-facing link into an 802.1Q trunk that carries VLANs 10 and 20. Validate with show commands on the switch and with cross-VLAN pings from the hosts.

Learning objectives

• Create VLANs on a Layer-2 switch and assign access ports appropriately
• Configure an 802.1Q trunk toward a router for router-on-a-stick inter-VLAN routing
• Verify VLAN membership and trunk state with IOS show commands
• Validate end-to-end inter-VLAN reachability from Linux hosts

Troubleshooting focus

• Diagnose and resolve the introduced fault: Trunk allow-lists, native VLAN alignment, and host VLAN assignment.
• Verify every link's interface status and IP addressing (`show ip interface brief`) and correct any interface that is down or misaddressed.
• Confirm each device's running configuration matches the lab objective, and bring any interface, route, or service that is not in its expected state back to health.
• Trace end-to-end reachability with ping/traceroute and isolate the first hop where forwarding fails.