Inter-VLAN routing is a process that allows for communication between different Virtual Local Area Networks (VLANs) within the same physical network. This process is necessary for networks that have multiple VLANs, as it allows for communication between them. Without inter-VLAN routing, the only way for devices on one VLAN to communicate with devices on another VLAN would be via a router.
Inter-VLAN routing is implemented using a Layer 3 device such as a router, which acts as a gateway between different VLANs. The router will have multiple physical interfaces, each of which is connected to a different VLAN. The router will then perform the routing function to determine the best path for communication between the different VLANs.
In order to configure inter-VLAN routing, the first step is to create the different VLANs. This is usually done with a switch that supports VLANs, such as a Cisco Catalyst switch. On the switch, you will need to create the different VLANs and assign each one an IP subnet. Once the VLANs have been created, they can be connected to the router.
The next step is to configure the router. This involves configuring the physical interfaces of the router to be associated with the different VLANs. The router will then need to be configured to perform inter-VLAN routing by enabling IP routing and configuring the IP routing protocols, such as RIP or OSPF.
Finally, the devices on the different VLANs will need to be configured to use the router as their default gateway. This will allow the devices to communicate with each other via the router.
Inter-VLAN routing can be used to create multiple secure networks within the same physical network. It is an important part of any network design and is essential for larger networks that require multiple VLANs.
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