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The router creates multiple virtual router interfaces that is associated with each VLAN on the trunk, and then it treats all frames tagged with that VLAN ID as if they came in and out of that subinterface. ![]() You will use a router to be able to route between the VLANs for your servers and client data instead of using a layer 3 switch. It simply means routing within your network between VLANs. ROAS is usually used in small to medium sized organizations that wants to implement inter-VLAN routing. It uses a router VLAN trunking configuration to give the router a logical interface connected to each VLAN. Router-on-a-stick (ROAS) is a feature that allows us to route packets to subnets associated with VLANs connected to a router 802.1Q trunk. And on the right side of the figure, each router has a VLAN trunk to connect and route for both VLANs. ![]() Two of the switches act as Layer 3 switches, combining the functions of a router and a switch, routing between all 12 subnets/VLANs. The figure shows a central site campus LAN on the left with 10 VLANs. The example network below shows what the second and third option looks like.
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