Virtual LANs (VLANs)
BAT54-Rail/F..
Release
7.54
06/08
10.2
This is how a VLAN works
339
U Management and user traffic on a LAN
Several hot spots are installed on an university campus, so that students
equipped with notebooks and WLAN cards have access to the Internet and
to the server of the library. The hot spots are connected to the university LAN.
Via this LAN the administrators also access the base stations to carry out
several management tasks via SNMP.
By setting up a virtual LAN between the base stations and the administrator’s
switch, management data is shielded against all “public” traffic on the LAN.
U Different organizations on one LAN
The flexibility of the modern world of work raises new challenges for admin-
istrators concerning planning and maintenance of network structures. The
occupation of the rooms by leaseholders changes permanently in public of-
fice buildings, and also inside of a company, teams are often newly assem-
bled. In both cases, the individual units must have an independent, protected
LAN. But this task is very burdensome to realize by hardware changes, or
even not at all, because e.g. only one single central cabling exists in the office
building.
Data traffic without
VLAN tag
VLAN ID=3
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