3 switching, 1 vlan – PLANET WGS3-24240 User Manual

Page 111

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User’s Manual of WGS3-24000 / WGS3-24240

111

4.3 Switching

This page provides all system operation for configuring VLAN, Port-based VLAN, Spanning Tree, Port Aggregation, and

Multicast Support.

The Switch page contains links to the following topics:

VLAN

Protocol-based VLAN

Filters

GARP

IGMP Snooping

Port Channel

Multicast Forwarding Database

Spanning Tree

Class of Service

Port Security

4.3.1 VLAN

VLAN Description

A Virtual Local Area Network (VLAN) is a network topology configured according to a logical scheme rather than the physical

layout. VLAN can be used to combine any collection of LAN segments into an autonomous user group that appears as a single

LAN. VLAN also logically segment the network into different broadcast domains so that packets are forwarded only between

ports within the VLAN. Typically, a VLAN corresponds to a particular subnet, although not necessarily.

VLAN can enhance performance by conserving bandwidth, and improve security by limiting traffic to specific domains.

A VLAN is a collection of end nodes grouped by logic instead of physical location. End nodes that frequently communicate with

each other are assigned to the same VLAN, regardless of where they are physically on the network. Logically, a VLAN can be

equated to a broadcast domain, because broadcast packets are forwarded to only members of the VLAN on which the

broadcast was initiated.

1.

No matter what basis is used to uniquely identify end nodes and assign these nodes VLAN

membership, packets cannot cross VLAN without a network device performing a routing

function between the VLAN.

2.

The Switch supports IEEE 802.1Q VLAN. The port untagging function can be used to remove

the 802.1 tag from packet headers to maintain compatibility with devices that are tag-unaware.

3.

The Switch's default is to assign all ports to a single 802.1Q VLAN named DEFAULT_VLAN.

As new VLAN is created, the member ports assigned to the new VLAN will be removed from

the DEFAULT_ VLAN port member list. The DEFAULT_VLAN has a VID = 1.

IEEE 802.1Q VLANs

IEEE 802.1Q (tagged) VLAN are implemented on the Switch. 802.1Q VLAN require tagging, which enables them to span the

entire network (assuming all switches on the network are IEEE 802.1Q-compliant).

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