Port; Introduction To Port Mirroring - 3Com Switch 4800G 24-Port Configuration Manual

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Introduction to Port
Mirroring
Classification of Port
Mirroring
P M
ORT IRRORING
When configuring port mirroring, go to these sections for information you are
interested in:
"Introduction to Port Mirroring" on page 895
■
"Configuring Local Port Mirroring" on page 897
■
"Configuring Remote Port Mirroring" on page 898
■
"Displaying and Maintaining Port Mirroring" on page 899
■
"Port Mirroring Configuration Examples" on page 900
■
Port mirroring allows you to duplicate the packets passing specified ports to the
destination mirroring port. As destination mirroring ports usually have data
monitoring devices connected to them, you can analyze the packets duplicated to
the destination mirroring port on these devices so as to monitor and troubleshoot
the network.
Figure 263 A port mirroring implementation
Network
Destination
mirroring port
Source
mirroring port
Host
There are two kinds of port mirroring: local port mirroring and remote port
mirroring.
Local port mirroring copies packets passing through one or more ports (known
■
as source ports) of a device to the monitor port (also destination port) for
analysis and monitoring purpose. In this case, the source ports and the
destination port are located on the same device.
Remote port mirroring implements port mirroring between multiple devices.
■
That is, the source ports and the destination port can be located on different
C
ONFIGURATION
Data monitoring device