Netgear M4100-12GF (GSM7212F) - ProSAFE Gigabit L2+ Managed Switch Guía De Administador

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VLAN Routing 
67
 ProSAFE M4100 Managed Switches
VLAN Routing Concepts
You can configure the ProSAFE M4100 Managed Switches with some ports supporting 
VLANs and some supporting routing. You can also configure it to allow traffic on a VLAN to 
be treated as if the VLAN were a router port. 
When a port is enabled for bridging (the 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 (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 is routed. An inbound multicast packet is 
forwarded to all ports in the VLAN, and also to 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 subnet. It could also be used when a 
VLAN spans multiple physical networks, or when more segmentation or security is required.
The next section shows you how to configure the ProSAFE M4100 Managed Switches 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 can be part of a VLAN that is itself a router 
port.
Create Two VLANs
This section provides an example of how to configure the M4100 Managed Switch 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.
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 that you would use to configure a M4100 Managed Switch to provide 
the VLAN routing support shown in the diagram.