Netgear M5300-52G3 (GSM7352Sv2h2) - ProSAFE 48 ports managed L3 gigabit stackable switch Administrator's Guide

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Tools 
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Managed Switches 
Port Mirroring
The port mirroring feature:
Allows you to monitor network traffic with an external network analyzer.
Forwards a copy of each incoming and outgoing packet to a specific port.
Is used as a diagnostic tool, debugging feature, or means of fending off attacks.
Assigns a specific port to copy all packets to.
Allows inbound or outbound packets to switch to their destination and to be copied to the 
mirrored port.
The example is shown as CLI commands and as a web interface procedure.
CLI: Specify the Source (Mirrored) Ports and Destination 
(Probe)
(Netgear Switch)#config
(Netgear Switch)(Config)#monitor session 1 mode
Enable mirror
(Netgear Switch)(Config)#monitor session 1 source interface 1/0/2 
Specify the source interface.
(Netgear Switch)(Config)#monitor session 1 destination interface 1/0/3
Specify the destination interface.
(Netgear Switch)(Config)#exit
(Netgear Switch)#show monitor session 1
Session ID     Admin Mode    Probe Port    Mirrored Port
-------------      ---------------     -------------    ----------------
      1                      Enable              1/0/3             1/0/2