3Com 4200G 12-Port Configuration Manual page 261

To meet the requirement above by using the RSPAN function, perform the following
configuration:
Define VLAN10 as remote-probe VLAN.
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Define Switch A as the destination switch; configure Ethernet1/0/2, the port that is
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connected to the data detect device, as the destination port for remote mirroring.
Disable the STP function on GigabitEthernet1/0/2.
Define Switch B as the intermediate switch.
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Define Switch C as the source switch, GigabitEthernet1/0/2 as the source port for
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remote mirroring, and GigabitEthernet1/0/5 as the reflector port. Set
GigabitEthernet1/0/5 to an Access port, with STP disabled.
Network diagram
Figure 78 Network diagram for RSPAN
Switch B Switch B Switch B
Switch C Switch C Switch C
The configuration procedure is as follows:
1 Configure Switch C.
<S4200G> system-view
[4200G] vlan 10
[4200G-vlan10] remote-probe vlan enable
[4200G-vlan10] quit
[4200G] interface gigabitethernet1/0/1
[4200G-GigabitEthernet1/0/1] port trunk permit vlan 10
[4200G-GigabitEthernet1/0/1] quit
[4200G] mirroring-group 1 remote-source
[4200G] mirroring-group 1 mirroring-port gigabitethernet1/0/2 outbound
[4200G] mirroring-group 1 reflector-port gigabitethernet1/0/5
[4200G] mirroring-group 1 remote-probe vlan 10
[4200G] display mirroring-group remote-source
mirroring-group 1:
port: GigabitEthernet1/0/2
mirroring vlan:
vlan: 10
2 Configure Switch B.
<S4200G> system-view
[4200G] vlan 10
[4200G-vlan10] quit
Data detect device Data detect device Data detect device
GE1/0/2 GE1/0/2 GE1/0/2
GE1/0/1 GE1/0/1 GE1/0/1
GE1/0/1 GE1/0/1 GE1/0/1
GE1/0/2 GE1/0/2 GE1/0/2
GE1/0/1 GE1/0/1 GE1/0/1
GE1/0/2 GE1/0/2 GE1/0/2
PC1 PC1 PC1
type: remote-source
outbound
reflector port: GigabitEthernet1/0/5
Mirroring Configuration 247
Switch A Switch A Switch A
status: active mirroring
mirroring mac:
remote-probe