3Com Switch 7750 Configuration Guide Guide

646 CHAPTER 59: MIRRORING CONFIGURATION
reflector port; and vice versa, you are not recommended to enable STP or DLDP
on a reflector port.
■ The reflector port cannot forward traffics as a normal port. Therefore, it is
recommended that you use an idle and in-down-state port as the reflector
port, and be careful to not add other settings on this port.
■ Be sure not to configure a port used to connect the intermediate and
destination switches as the mirroring source port. Otherwise traffic disorder
may occur in the network.
Configuring RSPAN on the intermediate switch
n
When a switch functions as the intermediate device or destination device for
remote mirroring, you are recommended to configure traffic redirect on the
incoming port in order to guarantee data mirroring is achieved normally. By
configuring traffic redirect, you can redirect all packets of the remote-probe VLAN
to the corresponding outgoing port (on the intermediate device) or mirroring
destination port (on the destination device). If you want to mirror packets in both
directions, you must configure traffic redirect on the incoming port because the
incoming port learns the source MAC addresses and destination MAC addresses of
packets at the same time. If the incoming port of a packet is the same as the
outgoing port of the packet, the packet is dropped. Refer to the QoS module in
this manual for configuring traffic redirect.
Configuring RSPAN on the destination switch
Tabl e 513 Configure RSPAN on the intermediate switch
Operation Command Description
Enter system view system-view -
Create a remote-probe VLAN
and enter VLAN view
vlan vlan-id
vlan-id is the ID of the
remote-probe VLAN.
Define the current VLAN as a
remote-probe VLAN
remote-probe vlan enable Required
Exit current view quit -
Enter port view of the relay
port through which the
intermediate switch is
connected to the source
switch, destination switch or
another intermediate switch
interface interface-type
interface-number
-
Configure the current port as
a trunk port
port link-type trunk
Required
By default, the type of the
port is access.
Configure the relay port to
permit packets from the
remote-probe VLAN to pass
port trunk permit vlan
remote-probe-vlan-id
Required
This configuration is necessary
for ports on the intermediate
switch that are connected to
the source switch or the
destination switch.
Tabl e 514 Configure RSPAN on the destination switch
Operation Command Description
Enter system view system-view -