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24-port NWay Ethernet Switch User’s Guide

40 Switch Management Concepts

data streams over a single trunk port. Switches that use a

load-balancing scheme that sends the packets of a host-to-

host data stream over multiple trunk ports cannot have a

trunk connection with the DES-3225G switch.

VLAN

VLANs are a collection of users or ports grouped together

in a secure, autonomous broadcast and multicast domain .

Membership to a VLAN is not restricted by a physical

location and can be defined across multiple LAN switches.

Two types of VLANs are implemented: MAC-based VLANs

and port-based VLANs. MAC-based VLANs are limited to

the switch and the devices connected to it, while port-

based VLANs support IEEE 802.1Q tagging, which enables

them to span the entire network (assuming all switches on

the network are IEEE 802.1Q-compliant).

Both MAC-based and port-based VLANs allow a network to

be segmented in order to reduce the size of broadcast

domains. All packets entering a VLAN will only be

forwarded to the stations (MAC-based) or ports (port-based)

that are members of that VLAN, and this even includes

Multicast frames and unknown unicast frames.

Another benefit of VLANs is that you can change the

network topology without physically moving stations or

changing cable connections. Stations can be ‘moved’

simply by changing VLAN settings from one VLAN (the

sales VLAN, for example) to another VLAN (the marketing

VLAN). This allows VLANs to accommodate network moves,

changes and additions with the utmost flexibility.

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