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GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches
Configuring VLAN Routing
VLANs divide broadcast domains in a LAN environment. Whenever hosts in one VLAN need
to communicate with hosts in another VLAN, the traffic must be routed between them. This is
known as inter-VLAN routing. On NETGEAR GS728TS, GS728TPS, GS752TS, and
GS752TPS switches, it is accomplished by creating Layer 3 interfaces (Switch virtual
interfaces (SVI)).
When a port is enabled for bridging (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 is routed. An inbound multicast packet is
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 subnet. It could also be used when a
VLAN spans multiple physical networks, or when additional segmentation or security is
required. 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.
Creating VLAN Routing Interfaces
1. Use the IP Configuration screen to enable routing on the switch (see IP Configuration on
page 161).
2. Determine the IP addresses you want to assign to the VLAN interface on the switch. For the
switch to be able to route between the VLANs, the VLAN interfaces must be configured with
an IP address. When the switch receives a packet destined for another subnet/VLAN, the
switch looks at the routing table to determine where to forward the packet. The packet is
then passed to the VLAN interface of the destination. It is then sent to the port where the
end device is attached.
3. If the VLAN has not been created, use the VLAN Routing Wizard screen to create and
configure the VLAN interfaces (see
VLAN Routing Wizard on page 165)
a. Specify the VLAN ID to configure for routing.
b. Enter the IP address and associated subnet mask in the available fields.
c. Select the ports or LAGs to include as VLAN members.
d. Apply the configuration changes to the switch.
4. If the VLAN has already been configured by using the VLAN pages under the Switching
tab, you can use the VLAN Routing Configuration page to enable routing on the VLAN and
assign an IP address and subnet mask (see
VLAN Routing Configuration on page 167).
5. Repeat this process for all VLANs identified to be configured as the routing interfaces.
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