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Ethernet Switching/Policy Setup - Motorola Netopia 3397GP Administrator's Handbook

Netopia 2200, 3300 and 7000 series routers


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- LAN-side VLAN with IP interface-to-VLAN binding
- Inter-VLAN routing groups to extend VLAN segmentation up through the IP routing layer.
❑ Bridged VLANs - these VLANs are used to bridge traffic from LAN to WAN
❑ Prioritization per VLAN and per port

Ethernet Switching/Policy Setup

Before you configure any VLANs, the unconfigured Gateway is set up as a router composed of a LAN
switch, a WAN switch, and a router in the middle, with LAN and WAN IP interfaces connected to their
respective switches. These bindings between Ethernet switch ports, IP LAN interface, IP WAN interface
and WAN physical ports are automatically created.
When you configure any VLANs, the default bindings are no longer valid, and the system requires
explicit binding between IP interfaces and layer 2 interfaces. Each VLAN can be thought of as a layer 2
switch, and enabling each port or interface in a VLAN is analogous to plugging it in to the layer 2
Thereafter, in order for devices to communicate on layer 2, they must be associated in the same VLAN.
For devices to communicate at layer 3, the devices must be either on the same VLAN, or on VLANs that
have an Inter-VLAN routing group enabled in common.
When configuring VLANs you must define how traffic needs to be forwarded:
❑ If traffic needs to be bridged between LAN and WAN you can create a single VLAN that encompasses
the WAN port and LAN ports.
❑ If traffic needs to be routed then you must define four elements:
• LAN-side VLANs
• WAN-side VLANs
• Associate IP Interfaces to VLANs
• Inter-VLAN Routing Groups: configuration of routing between VLANs is done by association of a
VLAN to a Routing Group. Traffic will be routed between VLANs within a routing group. The LAN IP
Ethernet Interface can be bound to multiple LAN VLANs, but forwarding can be limited between an
Ethernet LAN port and a WAN VLAN if you properly configure Inter-VLAN groups.
Inter-VLAN groups are also used to block routing between WAN interfaces. If each WAN IP interface
is bound to its own VLAN and if you configure a different Inter-VLAN group for each WAN VLAN then
no routing between WAN IP interfaces is possible.
❑ Example: to route between a VCC and all the LAN ports, which effectively is similar to the default
configuration without any VLANs:
Create a VLAN named "VccWan" consisting of vcc1, ip-vcc1, routing-group 1
Create a VLAN named "Lan" consisting of eth0.1, eth0.2, eth0.3, eth0.4, ssid1, ssid2, ssid3, ssid4
(etc.), ip-eth-a, routing-group 1

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