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Optical Stick Switch Routing Configuration Method

Fiber and communications infrastructure knowledge brief Published 20 Jun 2025

Use this reference to prepare product questions for BAGYOU FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Router-on-a-Stick allows a single router interface to route traffic between multiple VLANs using subinterfaces and trunking on the switch. OverviewRouter-on-a-Stick (ROAS) is a method to enable inter-VLAN routing using a single physical router interface connected to a switch trunk port.

Each VLA

N is assigned a subinterface on the router, and the switch port connected to the router is configured as a trunk to carry all VLAN traffic. This approach is scalable and avoids dedicating multiple physical interfaces for each VLAN.

Step-by-

Step Configuration1.

Configure VLA

Ns on the SwitchCreate VLANs and assign names: BashCopySwitch(config)# vlan 10Switch(config-vlan)# name SalesSwitch(config)# vlan 20Switch(config-vlan)# name Marketing Repeat for all required VLANs (e.g., VLAN 30, VLAN 99 for management),. 2.

Configure Access Ports

Assign switch ports to VLANs for end devices: BashCopySwitch(config)# interface fa0/2Switch(config-if)# switchport mode accessSwitch(config-if)# switchport access vlan 10Switch(config)# interface fa0/3Switch(config-if)# switchport mode accessSwitch(config-if)# switchport access vlan 20 Ensure PCs in each VLAN have IP addresses in the corresponding subnet. 3.

Configure Trunk Ports

Set the switch port connecting to the router as a trunk: BashCopySwitch(config)# interface fa0/1Switch(config-if)# switchport mode trunkSwitch(config-if)# switchport trunk allowed vlan 10,20,30,99 If connecting multiple switches, configure trunk ports between switches similarly. 4.

Configure Router Subinterfaces

On the router, create a subinterface for each VLAN and assign IP addresses: BashCopyRouter(config)# interface g0/0. 10Router(config-subif)# encapsulation dot1Q 10Router(config-subif)# ip address 192. 168.

10. 1 255. 255.

255. 0Router(config)# interface g0/0. 20Router(config-subif)# encapsulation dot1Q 20Router(config-subif)# ip address 192.

168. 20. 1 255.

255. 255. 0 Repeat for all VLANs.

Each subinterface acts as the default gateway for its VLAN. 5.

Verify Connectivity

Check VLA

N and trunk status on the switch: BashCopySwitch# show vlan briefSwitch# show interfaces trunk Verify router subinterfaces and routing table: BashCopyRouter# show ip interface briefRouter# show ip route Test inter-VLAN connectivity by pinging devices across VLANs.

Best Practices

Use a management VLAN (e.g., VLAN 99) for switch administration. Ensure trunk encapsulation matches on both switch and router (usually 802. 1Q).

Document VLAN I

Ds, subinterface IPs, and port assignments for troubleshooting. For multiple switches, consider EtherChannel for trunk links to increase bandwidth. By following these steps, a single router interface can efficiently route traffic between multiple VLANs, providing a scalable and manageable inter-VLAN routing solution.

Optical Stick Switch Routing Configuration Method - BAGYOU FIBRE NETWORKS [PDF]

Optical Stick Switch Routing Configuration Method

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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