3Com 10014298 manual Vlan Overview, Configuring VLANs, Configuring GARP/GVRP

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VLAN CONFIGURATION

	This chapter covers the following topics:
	■	VLAN Overview
	■	Configuring VLANs
	■	Configuring GARP/GVRP
	■
VLAN Overview	A virtual local area network (VLAN) creates logical groups of LAN devices into
	segments to implement virtual workgroups.

Using VLAN technology, you can logically divide the physical LAN into different broadcast domains. Every VLAN contains a group of workstations with the same demands. However, the workstations of a VLAN do not have to belong to the same physical LAN segment.

Within a VLAN, broadcast and unicast traffic is not forwarded to other VLANs. Therefore, VLAN configurations are very helpful in controlling network traffic, saving device investment, simplifying network management and improving security.

VLANs are divided into four categories:

■Port-based VLAN

■Protocol-based VLAN

■MAC-based VLAN

■Policy-based VLAN

Port-based VLANs define VLAN members according to switch ports. This is the simplest and most efficient way to create VLANs.

The Switch 7750 supports port-based and network layer-based VLANs. The network layer-based VLANs are divided by protocols such as IP, so they are called protocol-based VLANs. Because this method is based on protocols, it is not related to routes and has nothing to do with routing at the network layer.

Configuring VLANs The following sections describe how to configure VLANs:

■Common VLAN Configuration Tasks

■Configuring Port-Based VLANs

■Configuring Protocol-Based VLANs