Reference Guide
19
Port Monitoring
The port monitoring feature allows you to monitor network trac by forwarding a copy of each incoming or outgoing packet from
one port to another port.
Important Points to Remember
• Port monitoring is supported on physical ports only. Port-channel interfaces and virtual local area networks (VLANs), are not
supported.
• 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 number is 0 and
server-facing port numbers are from 1 to 8. The monitoring interface must be an uplink port in the chassis.
• Dell Networking OS 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 as shown in example.
Example
Dell(conf)#mon ses 1
Dell(conf-mon-sess-1)#source tengig 0/1 destination tengig 0/6 direction
both
Dell(conf-mon-sess-1)#do show mon ses
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
1 TenGig 0/1 TenGig 0/6 both interface
Port-based
Dell(conf-mon-sess-1)#mon ses 2
Dell(conf-mon-sess-2)#source tengig 0/1 destination tengig 0/7 direction
both
% Error: MD port is already being monitored.
NOTE: There is no limit to the number of monitoring sessions per system, provided that there are only four destination
ports per port-pipe. If each monitoring session has a unique destination port, the maximum number of session is four per
port-pipe.
description
Enter a description of this monitoring session.
Syntax
description {description}
To remove the description, use the no description {description} command.
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