Reference Guide

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Port Monitoring
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.
The commands in this chapter are supported on the S4820T platform.
Important Points to Remember
• Port monitoring is supported on physical ports only. Logical interfaces, such as Port Channels and virtual local
area networks (VLANs), are not supported.
• The Dell Networking operating software (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.
• 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.
• 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.
description
Enter a description of this monitoring session.
S4820T
Syntax
description {description}
To remove the description, use the no description {description} command.
Parameters
description Enter a description regarding this session (80 characters maximum).
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