
Diagnostics
12.4 Port Mirroring
SCALANCE XM-400/XR-500 Command Line Interface (CLI)
922
Configuration Manual, 06/2016, C79000-G8976-C252-11
12.4
Port Mirroring
Note
It cannot be guaranteed when mirroring the data traffic that all packets are mirrored.
With the port mirroring function, you copy the data stream of one or more ports to another
interface to be able to analyze this data stream without disturbing operation.
Note
Mirroring a port does not work beyond switch core boundaries.
Note
You need to disable port mirroring if you want to connect a normal end device to the monitor
port.
Note the data rate
If the maximum data rate of the mirrored port is higher than that of the monitor port, data
may be lost and the monitor port no longer reflects the data traffic at the mirrored port.
Several ports can be mirrored to one monitor port at the same time.
Several source ports from the same VLAN
If in a VLAN you select more than one source port for the port-based egress mirroring,
unknown unicast and multicast frames as well as broadcast frames are forwarded only once
to the destination port. With several sessions, the corresponding frames are only visible in
one session. They are only mirrored on the one destination port with the lowest hardware
index.
12.4.1
The "show" commands
This section describes commands with which you display various settings.
12.4.1.1
show monitor
Description
This command shows the status of the port mirroring function.