The above situation is an example of when you would need a router on a stick. However, in a standard configuration, without a config subif IP address, this is the only way that the two VLANs can forward their packets to one another. As you can probably tell, this will mean that the two networks are technically separate. If any two machines or devices need to communicate, you need to place a router between them. Thus, even though they have the same wires passing throughout the network, they will not send Ethernet frames to each other. In such cases, all the devices with a common switch will not send Ethernet frames to one another. A virtual local-area network lets several other similar networks connect to a physical LAN on one IP address. Therefore, a router on a stick also connects the virtual networks through one IP address, allowing you to configure a subif IP address to communicate. They share an Ethernet network interface port of one IP address between two or more virtual networks. You can probably guess why – their purpose is to facilitate traffic within virtual local area networks or what you might know as VLANs. Routers on a stick are also known as one-armed routers.
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