VLAN Tagging

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The MIPU / LIPU / LIPS and GIPU / GIPH and IP5000-series/IPT2000-series phones support

802.1 Q 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.

 

 


























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