Command Line Reference Guide

Port Monitoring | 1085
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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 (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; VLAN and port-channel interfaces do not support port
monitoring.
• A SONET port may only be a monitored port.
• 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 Monitored (source, “MD”) and Monitoring ports (destination, “MG”) 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.
• There may only be one destination port in a monitoring session.
• A source port (MD) can only be monitored by one destination port (MG).
• On the E-Series TeraScale, only one MG and one MD may be in a single port-pipe.
• The C-Series and S-Series may only have four destination ports per port-pipe. There is no
limitation on the total number of monitoring sessions.
• A monitoring port can monitor any physical port in the chassis.
• 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.
• On the S-Series, one monitor session can have only one MG port. There is no restriction on the
number of source ports, or destination ports on the chassis.
Note: The monitoring port should not be a part of any other configuration.