User`s manual

NPort S8000 Series Switch Featured Functions
6-27
Benefits of VLANs
The main benefit of VLANs is that they provide a network segmentation system that is far more flexible than
traditional networks. Using VLANs also provides you with three other benefits:
• VLANs ease the relocation of devices on networks: With traditional networks, network administrators
spend most of their time dealing with moves and changes. If users move to a different subnetwork, the
addresses of each host must be updated manually. With a VLAN setup, if a host on VLAN Marketing, for
example, is moved to a port in another part of the network, and retains its original subnet membership, you
only need to specify that the new port is on VLAN Marketing. You do not need to carry out any re-cabling.
• VLANs provide extra security: Devices within each VLAN can only communicate with other devices on
the same VLAN. If a device on VLAN Marketing needs to communicate with devices on VLAN Finance, the
traffic must pass through a routing device or Layer 3 switch.
• VLANs help control traffic: With traditional networks, congestion can be caused by broadcast traffic that
is directed to all network devices, regardless of whether or not they need it. VLANs increase the efficiency
of your network because each VLAN can be set up to contain only those devices that need to communicate
with each other.
VLANs and Moxa EtherDevice Switch
Your NPort S8000 provides support for VLANs using IEEE Std 802.1Q-1998. This standard allows traffic from
multiple VLANs to be carried across one physical link. The IEEE Std 802.1Q-1998 standard allows each port on
your NPort S8000 to be placed in:
• Any one VLAN defined on the NPort S8000.
• Several VLANs at the same time using 802.1Q tagging.
The standard requires that you define the 802.1Q VLAN ID for each VLAN on your NPort S8000 before the
switch can use it to forward traffic:
Managing a VLAN
A new or initialized NPort S8000 contains a single VLAN—the Default VLAN. This VLAN has the following
definition:
• VLAN Name—Management VLAN
• 802.1Q VLAN ID—1 (if tagging is required)
All the ports are initially placed on this VLAN, and it is the only VLAN that allows you to access the management
software of the NPort S8000 over the network.
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Switch A
Switch B
Backbone connects multiple switches
Department 1
VLAN 1
Department 2
VLAN 2
Department 3
VLAN 3