Reference Guide

Port Monitoring | 191
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Port Monitoring
Overview
The port monitoring feature allows you to monitor network traffic by forwarding a copy of each
incoming or outgoing packet from one port to another port.
Monitoring Commands
• description
• monitor session
• show config
• show monitor session
• show running-config monitor session
• source (port monitoring)
Important Points to Remember
• Port monitoring is supported on physical ports only; virtual local area networks (VLANs) and
port-channel interfaces do not support port monitoring.
• The monitoring (destination, “MG”) and monitored (source, “MD”) ports must be on the same
switch.
• The monitored (source) interface must be a server-facing interface in the format slot/port, where
valid slot numbers are 0-1 and server-facing port numbers are from 1 to 32. The monitoring
interface must be an uplink port in the chassis.
• FTOS permits a limited set of commands for monitoring ports. To display these commands, use
the ? command.
• A monitoring port may not be a member of a VLAN.
• There may only be one destination port in a monitoring session.
• A source port (MD) can only be monitored by one destination port (MG). If you try to assign a
monitored port to more than one monitoring port, the following error is displayed (Message 1).