Switch port mirroring

Switch port mirroring is often used when sniffing traffic to/from a device. Se drawing below.

Switch with port mirroring

Cisco Switch

Example below: Send a copy of traffic on fastethernet 0/1 to fastethernet 0/2. Traffic in both directions are mirrored.

SW1# <input>configure terminal</input>
SW1(config)# <input>monitor session 1 source fastethernet0/1</input> 
SW1(config)# <input>monitor session 1 destination fastethernet 0/2</input>

Remove mirror from session 1.

SW1# <input>CONFIGURE TERMINAL</input>
SW1(config)# <input>no MONITOR SESSION 1</input>

Zyxel switch

Copy traffic from port 1,4,5 and 6 to port 3

Switch(config)# <input>mirror-port</input>
Switch(config)# <input>mirror-port 3</input>
Switch(config)# <input>interface port-channel 1,4-6</input>
Switch(config-interface)# <input>mirror</input>
Switch(config-interface)# <input>mirror dir egress</input>

Remove mirror again

Switch(config)# <input>no mirror-port</input>

LG iPECS ES-3026P

From CLI

Monitor traffic in both directions on port 1/7 mirrorport 1/17

iPECS Ethernet Switch Administration

Username: <input>admin</input>
Password: <input>admin</input>

      CLI session with the ES-3026P is opened.
      To end the CLI session, enter [Exit].

ES-3026P#<input>configure</input>
ES-3026P(config)#<input>interface ethernet 1/17</input>
ES-3026P(config-if)#<input>port monitor ethernet 1/7 both</input>

Remove mirror port again

ES-3026P#<input>configure</input>
ES-3026P(config)#<input>interface ethernet 1/17</input>
ES-3026P(config-if)#<input>no port monitor ethernet 1/7</input>

From GUI

Remove mirror from webinterface on switch

Add mirror from webinterface on switch