Port mirroring examples:

Allied Telesys

Mirror the traffic from port 9 to port 2:

interface port1.0.2
  mirror interface port1.0.9 direction both
  switchport

Cisco

Mirror the traffic from ports 4, 5, 6 and 8 to port 3, member of VLAN 4001

interface FastEthernet0/3
  switchport access vlan 4001
  switchport mode access

monitor session 1 source interface Fa0/4 - 6 , Fa0/8
monitor session 1 destination interface Fa0/3

Huawei

Mirror the traffic from port 23 to port 24, member of VLAN 4001

interface GigabitEthernet0/0/24
  port link-type access
  port default vlan 4001

observe-port 1 interface GigabitEthernet0/0/24

interface GigabitEthernet0/0/23
  ... port configuration here ...
  port-mirroring to observe-port 1 inbound
  port-mirroring to observe-port 1 outbound

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