Command Line Reference Guide

Port Monitoring | 779
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Port Monitoring
Overview
The Port Monitoring feature enables you to monitor network traffic by forwarding a copy of each
incoming or outgoing packet from one port to another port.
The commands in this chapter are generally supported on the C-Series, E-Series, and S-Series, with
one exception, as noted in the Command History fields and by these symbols under the command
headings:
c e s
Commands
• description
• flow-based enable
• monitor session
• show config
• show monitor session
• show running-config monitor session
• source
Important Points to Remember
• On the E-Series, Port Monitoring is supported on TeraScale and ExaScale platforms.
• Port Monitoring is supported on physical ports only. Logical interfaces, such as Port Channels and
VLANs, are not supported.
• FTOS supports as many monitor sessions on a system as the number of port-pipes.
• A SONET port can only be configured as a monitored port.
• The monitoring (destination, “MG”) and monitored (source, “MD”) ports must be on the same
switch.
• A monitoring port can monitor any physical port in the chassis.
• Only one MG and one MD may be in a single port-pipe.
• A monitoring port can monitor more than one port.
• More than one monitored port can have the same destination monitoring port.
• FTOS on the S-Series supports multiple source ports to be monitored by a single destination port
in one monitor session.