Vlan Tagging - Toshiba Strata CIX40 General Description Manual

VLAN Tagging

System Availability: All systems
The MIPU / LIPU / LIPS and GIPH and IPT2000 phones support 802.1Q Virtual Local Area
Network (VLAN) technologies. For sites with LANs that have 1000's of IP devices, VLANs can
be used to separate the network virtually rather than physically, to prevent the broadcast and other
traffic from one virtual LAN (typically a data lan) from impairing the performance of equipment
on another virtual LAN (for example a VoIP LAN) even though the devices are plugged into the
same physical network. VLAN for the IPT phone and the phone's data port can each be
programmed manually in the phone, or remotely through eManager. And within or without
VLANs, 802.1P and Diffserv can be used to provide Quality of Service for voice by allowing
voice packets to be prioritized over data packets. Note that when using 802.1Q or 802.1P it is
important to ensure that all the network of the ethernet switches and routers are capable of
supporting this.
Reasons why a company might want VLANs:
• Security – Separating systems that have sensitive data from the rest of the network decreases
the chances that people will gain access to information they are not authorized to see.
• Projects/Special Applications – Managing a project or working with a specialized application
can be simplified by using a VLAN that brings all the required nodes together.
• Performance/Bandwidth – Careful monitoring of network use enables the network
administrator to create VLANs that reduce the number of router hops and increase the apparent
bandwidth for network users.
• Access Lists – Provides the network administrator with a way to control who sees the different
types of network traffic. An access list is a table the network administrator creates that lists
which addresses have access to that network.
• Broadcasts/Traffic flow – Since a principle element of a VLAN is the fact that it does not pass
broadcast traffic to nodes that are not part of the VLAN, it automatically reduces broadcast
traffic.
Strata CIX General Description 12/07
Features
VLAN Tagging
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