6 Routing Commands

VLAN Routing

You can configure the FortiSwitch-100 software with some ports supporting VLANs and some supporting routing. You can also configure the software to allow traffic on a VLAN to be treated as if the VLAN were a router port.

When a port is enabled for bridgin g (default) rather than routing, all normal bridge processing is performed for an inbound packet, which is then associated with a VLAN. Its MAC Destination Address (MAC DA) and VLAN ID are used to search the MAC address table. If routing is enabled for the VLAN and the MAC DA of an inbound unicast packet is that of the internal bridge-router interface, the packet will be routed. An inbound multicast packet will be forwarded to all ports in the VLAN, plus the internal bridge -router interface if it was received on a routed VLAN.

Since a port can be configured to belong to more than one VLAN, VLAN routing might be enabled for all of the VLANs on the port, or for a subset. VLAN Routing can be used to allow more than one physical port to reside on the same subne t. It could also be used when a VLAN spans multiple physical networks, or when additional segmentation or security is required. This section shows how to configure the FortiSwitch-100 software to support VLAN routing and how to use RIP and OSPF. A port can be either a VLAN port or a router port, but not both. However, a VLAN port may be part of a VLAN that is itself a router port.

VLAN Routing Configuration

This section provides an example of how to configure the FortiSwitch-100 software to support VLAN routing. The configuration of the VLAN router port is similar to that of a physical port. The main difference is that, after the VLAN has been created, you must use the show ip vlan command to determine the VLAN’s interface ID so that you can use it in the router configuration commands.

CLI Examples

The diagram in this section shows a Layer 3 switch configured for port routing. It connects two VLANs, with two ports participating in one VLAN, and one port in the other. The script shows the commands you would use to configure the FortiSwitch-100 software to provide the VLAN routing support shown in the diagram.

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Fortinet MR1 manual Vlan Routing Configuration, CLI Examples