PointRed Telecom Ltd. MCRD-2458 Manuale Utente

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Figure 26. Interface Table View 

A virtual LAN (VLAN) is a group of devices on one or more LANs that are 
configured so that they can communicate as if they were attached to the same 
network, when in fact they are located on a number of different LAN segments. 
Because VLANs are based on logical instead of physical connections, they are 
very flexible for user/ host management, bandwidth allocation and resource 
optimization. The IEEE 602.1Q specification establishes a standard method for 
tagging Ethernet frames with VLAN membership information. 

The IEEE 802.1Q standard defines the operation of VLAN bridges that permit the 
definition, operation and administration of virtual LAN topologies within a Bridged 
LAN infrastructure. The 802.1Q standard is intended to address the problem of 
how to break large networks into smaller parts so broadcast and multicast traffic 
does not require more bandwidth than necessary. The standard also helps 
provide a higher level of security between segments of internal networks. 

To make a router an 802.1Q compliant device, one or ore VLAN interfaces must 
be created with the proper tags. This can be accomplished in the VLAN tab of the 
MicroView NMS window. VLAN interfaces can be added, removed and managed 
from this tab.