User Guide
18
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5.4 Mirror
Port mirroring is used to transfer the packets of one or more monitored ports to
another port, allowing a security department or administrator to monitor Internet
access, traffic flows and packets.
The
bandwidth
of
the
monit
oring
por
t
cannot
be
lo
wer
than
tha
t
of
the
monit
ored
por
t.
If the monitoring port is the monitored port, the system automatically ignores this
monitored port and does not duplicate the traffic.
This
func
tion
suppor
ts
cr
oss-VLAN
monit
oring.
Monit
oring
is
allo
wed
e
ven
if
the
monit
ored
por
t
and
the
monit
oring
por
t
belong
t
o
diff
erent
VL
AN
gr
oups.
Mirror:
w
Mirror Port: Selects a port to serve as the monitoring port
w
Mirrored Port: Selects one or more ports to be monitored
5.5 VLAN
A VLAN or Virtual Local Area Networks can be used to establish secure autono-
mous broadcast/multicast domains. A VLAN is used to divide a network into
multiple network segments and/or to shrink broadcast domains for application or
departmental optimization. Within a VLAN, all Ethernet packets, such as unicast,
multicast, broadcast and unknown unicast packets will be transferred only to other
devices within the VLAN group. A VLAN can be used to change the topological
structure of the network without any movement of a network device or change of
network connections. You can modify the VLAN settings of a device for example,
to “move” a device from the VLAN of one group to that of another group. This
helps create secure, optimized departmental (or function/application specific)
networks that cannot be accessed by other departments, applications or functions.
This also means the network nodes or devices can be moved, changed or added
without having to physically move the device.
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