Router-on-a-stick uses a single router interface connected to a switch trunk. You create subinterfaces on the router, one per VLAN. Each subinterface has an IP address in that VLAN's subnet. Traffic from VLAN goes to subinterface , gets routed, and exits via subinterface for VLAN . All traffic passes through one physical link, which can become a bottleneck.
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$ curl repovive.com/roadmaps/network-design/switching-and-vlans/router-on-a-stick
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