Reference Guide

Port Monitoring | 1143
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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:
e E-Series, c C-Series, s S-Series, or .
Commands
• description
• flow-based enable
• monitor session
• show config
• show monitor session
• show running-config monitor session
• source (port monitoring)
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.
• A SONET port can only be configured as a monitored port.
• FTOS supports as many monitor sessions on a system as the number of
port-pipes.
• The monitoring (destination, “MG”) and monitored (source, “MD”) ports must
be on the same switch.
• In general, a monitoring port should have no ip address and no shutdown as the
only configuration; FTOS permits a limited set of commands for monitoring
ports; display them using the command ?. A monitoring port also may not be a
member of a VLAN.