3Com 8807 Command Reference Manual page 255

group may contain one monitoring port and several monitored ports. You can also
specify the direction of the monitored packets.
Switch 8800 Family series support up to 24 mirroring groups at a port.
Related command: display mirroring-group.
n
Switch 8800 Family series support cross-card mirroring, that is, the monitoring and
monitored ports can be at different cards.
Consider these issues when configuring port mirroring:
For intra-card mirroring, only one monitoring port can be configured for the
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mirroring groups in the same direction.
For cross-card mirroring, only one monitoring port (which is on another card)
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can be configured for the mirroring groups in the same direction.
You can only configure eight monitored ports for all the mirroring groups in
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transmit group.
One port can act as mirroring port and mirrored port at the same time for
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different mirroring group.
More issues for the GV48 or GP48 card:
For the mirroring (including inbound port mirroring and outbound port
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mirroring) on the same GV48 or GP48 card, only one monitoring port is
allowed.
For all mirroring groups configured in the system, only one monitoring port is
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allowed on the same GV48 or GP48 card.
By default, two port groups of the XP4 card are created. The member ports are
port 0-1 and port 2-3 respectively. Consider these issues when configuring port
mirroring:
The XP4 card does not support cross-group port mirroring, that is, the
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monitoring ports and monitored ports in the same port mirroring group can
only be port 0 to 1 or port 2 to 3.
You can configure an inbound monitoring port and an outbound monitoring
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port in a port group respectively. There is only one monitoring port in other
types of interface cards.
Related command: display mirroring-group.
Example
# Configure mirroring group 1, the monitored ports are Ethernet3/1/1 to
Ethernet3/1/3, and the monitoring port is Ethernet3/1/4, monitoring only inbound
packets.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] mirroring-group 1 inbound ethernet 3/1/1 ethernet 3/1/2
ethernet 3/1/3 mirrored-to ethernet 3/1/4
QoS Commands 253