HP 6125G Configuration Manual page 85

Figure 32 Layer 2 remote port mirroring implementation
On the network shown in
The source device does the following:
Copies the packets received on the source port GigabitEthernet 1/0/1 to the egress port
1.
GigabitEthernet 1/0/2.
Forwards the packets to the intermediate device, which then broadcasts the packets in the remote
2.
probe VLAN.
Transmits the packets to the destination device via the intermediate device.
3.
Then, the destination device does the following:
Receives the mirrored packets.
4.
Compares their VLAN IDs to the ID of the remote probe VLAN configured in the remote destination
5.
group.
If the VLAN IDs of these mirrored packets match the remote probe VLAN ID, the device forwards
6.
them to the data monitoring device through the monitor port GigabitEthernet 1/0/2.
Allow remote probe VLAN to pass through the intermediate devices to make sure the source device and
the destination device can communicate at Layer 2 in the remote probe VLAN.
For a mirrored packet to successfully arrive at the remote destination device, make sure the VLAN ID of
the mirrored packet is not removed or changed. Otherwise, the Layer 2 remote port mirroring
configuration will fail.
To monitor both the received and sent packets of a port in a mirroring group, you must use the
mac-address mac-learning disable command on the source, intermediate, and destination devices to
disable MAC address learning of the remote probe VLAN. For more information about the mac-address
mac-learning disable command, see Layer 2—LAN Switch Command Reference.
Figure 32,
78