3Com 4500 PWR 26-Port Configuration Manual page 569

Do not configure a port connecting the intermediate switch or destination switch as the mirroring
source port. Otherwise, traffic disorder may occur in the network.
With port mirroring – STP collaboration enabled, if you configure a port in Discarding state as a
mirroring port, the port mirroring configuration does not take effect until the port transits to
Forwarding state.
Suppose port mirroring – STP collaboration is enabled on a device in an MSTP network. To make
the port mirroring configuration take effect on a port, make sure that the port is in Forwarding state
in all instances.
To enable port mirroring on an XRN fabric, you are recommended to enable port mirroring – STP
collaboration.
Configuration on a switch acting as an intermediate switch
1) Configuration prerequisites
The trunk ports and the remote-probe VLAN are determined.
Layer 2 connectivity is ensured between the source and destination switches over the
remote-probe VLAN.
2) Configuration procedure
Follow these steps to perform configurations on the intermediate switch:
To do...
Enter system view
Create a VLAN and enter VLAN
view
Configure the current VLAN as
the remote-probe VLAN
Return to system view
Enter the view of the Ethernet
port connecting to the source
switch, destination switch or
other intermediate switch
Configure the current port as
trunk port
Configure the trunk port to
permit packets from the
remote-probe VLAN
Note that a Switch 4500 acting as the intermediate switch in remote port mirroring networking does not
support bidirectional packet mirroring (the both keyword).
Configuration on a switch acting as a destination switch
1) Configuration prerequisites
Use the command...
system-view
vlan vlan-id
remote-probe vlan enable
quit
interface interface-type
interface-number
port link-type trunk
port trunk permit vlan
remote-probe-vlan-id
46-7
Remarks
—
vlan-id is the ID of the
remote-probe VLAN.
Required
—
—
Required
By default, the port type is
Access.
Required