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VLAN Overview

36 Enterasys Xpedition User Reference Manual

Policy-based VLANs

Policy-based VLANs are the most general definition of VLANs. Each incoming

(untagged) frame is looked up in a policy database, which determines the VLAN to which

the frame belongs. For example, you could set up a policy which creates a special VLAN

for all E-mail traffic between the management officers of a company, so that this traffic

will not be seen anywhere else.

XP VLAN Support

The XP supports:

• Port-based VLANs

• Protocol-based VLANs

• Subnet-based VLANs

When using the XP as an L2 bridge/switch, use the port-based and protocol-based VLAN

types. When using the XP as a combined switch and router, use the subnet-based VLANs

in addition to port-based and protocol-based VLANs. It is not necessary to remember the

types of VLANs in order to configure the XP, as seen in the section on configuring the XP.

VLANs and the XP

VLANs are an integral part of the XP family of switching routers. The XP switching

routers can function as layer-2 (L2) switches as well as fully-functional layer-3 (L3)

routers. Hence they can be viewed as a switch and a router in one box. To provide

maximum performance and functionality, the L2 and L3 aspects of the XP switching

routers are tightly coupled.

The XP can be used purely as an L2 switch. Frames arriving at any port are bridged and

not routed. In this case, setting up VLANs and associating ports with VLANs is all that is

required. You can set up the XP switching router to use port-based VLANs, protocol-

based VLANs, or a mixture of the two types.

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Cabletron Systems SSIM-R8-02 Spécifications Page 56