What is meant by Router-on-a-stick

Router-on-a-stick

·         Router-on-a-stick is nothing but a setup between Layer 2 switch and router connected using Ethernet link (VLAN trunk link).

·         If there are 3 VLANs configured in a switch, these 3 VLANs cannot communicate with each other using L2 switches as they are in 3 different subnets.  Layer 2 frames can only communicate inside VLAN. Only routers or layer 3 switches can route packets between VLANs.

·         A Layer2 switch with 3 VLANs is connected to the router using a single physical link. This design is sometimes called Router-on-a-stick.

·         Router-on-a-stick design is not used in L3 switches. Layer 3 switches act as a Layer 2 LAN switch as well as a Layer 3 router.

·         Layer 3 switches are also known as multilayer switches.

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