Concept Guide

Port Monitoring
The Aggregator supports user-congured port monitoring. See Configuring Port Monitoring for the conguration commands to
use.
Port monitoring copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port. The source port is the
monitored port (MD) and the destination port is the monitoring port (MG).
Supported Modes
Standalone, PMUX, VLT, Stacking, and Full-Switch
Topics:
• Conguring Port Monitoring
• Important Points to Remember
• Port Monitoring
Conguring Port Monitoring
To congure port monitoring, use the following commands.
1 Verify that the intended monitoring port has no conguration other than no shutdown, as shown in the following example.
EXEC Privilege mode
show interface
2 Create a monitoring session using the command monitor session from CONFIGURATION mode, as shown in the following example.
CONFIGURATION mode
monitor session
3 Specify the source and destination port and direction of trac, as shown in the following example.
MONITOR SESSION mode
source
NOTE
: By default, all uplink ports are assigned to port-channel (LAG) 128 and the destination port in a port monitoring session
must be an uplink port. When you congure the destination port using the source command, the destination port is removed
from LAG 128. To display the uplink ports currently assigned to LAG 128, enter the show lag 128 command.
Example of Viewing Port Monitoring Conguration
To display information on currently congured port-monitoring sessions, use the show monitor session command from EXEC
Privilege mode.
Dell(conf)# monitor session 0
Dell(conf-mon-sess-0)# source tengig 1/1 dest tengig 1/42 direction rx
Dell(conf-mon-sess-0)#exit
Dell(conf)# do show monitor session 0
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 TenGig 1/1 TenGig 1/42 rx interface Port-based
Dell(conf)#
16
182 Port Monitoring