Bedienungsanleitung Netgear GS308T (Seite 335 von 362) (Englisch)

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S350 Series 8-Port Gigabit Ethernet Smart Managed Pro Switch Models GS308T and GS310TP

Configuration Examples User Manual335

Virtual Local Area Networks (VLANs)

A local area network (LAN) can generally be defined as a broadcast domain. Hubs, bridges,

or switches in the same physical segment or segments connect all end node devices. End

nodes can communicate with each other without the need for a router. Routers connect LANs

together, routing the traffic to the appropriate port.

A virtual LAN (VLAN) is a local area network with a definition that maps workstations on

some basis other than geographic location (for example, by department, type of user, or

primary application).

To enable traffic to flow between VLANs, traffic must go through a

router, just as if the VLANs were on two separate LANs.

A VLAN is a group of computers, servers, and other network resources that behave as if they

were connected to a single network segment—even though they might not be. For example,

all marketing personnel might be spread throughout a building. Y

et if they are all assigned to

a single VLAN, they can share resources and bandwidth as if they were connected to the

same segment. The resources of other departments can be invisible to the marketing VLAN

members, accessible to all, or accessible only to specified individuals, depending on how the

IT manager set up the VLANs.

VLANs present a number of advantages:

• It is easy to do network segmentation. Users who communicate most frequently with

each other can be grouped into common VLANs, regardless of physical location. Each

group’

s traf

fic is contained largely within the VLAN, reducing extraneous traffic and

improving the efficiency of the whole network.

• They are easy to manage.

The addition of nodes, as well as moves and other changes,

can be dealt with quickly and conveniently from a management interface rather than from

the wiring closet.

• They provide increased performance. VLANs free up bandwidth by limiting node-to-node

and broadcast traffic throughout the network.

• They ensure enhanced network security. VLANs create virtual boundaries that can be

crossed only through a router

. So standard, router-based security measures can be used

to restrict access to each VLAN.

Packets received by the switch are treated in the following way:

• When an untagged packet enters a port, it is automatically tagged with the port’s default

VLAN ID tag number. Each port supports a default VLAN ID setting that is user

configurable (the default setting is 1). The default VLAN ID setting for each port can be

changed on the Port PVID Configuration page. See

Configure Port PVID Settings on

page 118.

• When a tagged packet enters a port, the tag for that packet is unaffected by the default

VLAN ID setting.

The packet proceeds to the VLAN specified by its VLAN ID tag number.

• If the port through which the packet entered is not a member of the VLAN as specified by

the VLAN ID tag, the packet is dropped.

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