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Monitoring and Analyzing Switch Operation
Port and Static Trunk Monitoring Features
CLI: Configuring Port and Static Trunk Monitoring
Port and Static Trunk Monitoring Commands Used in This Section
You must use the following configuration sequence to configure port and
static trunk monitoring in the CLI:
1. Assign a monitoring (mirror) port.
2. Designate the port(s) and static trunk(s) to monitor.
Monitoring Limitations
The following limitations apply to monitoring and mirroring for the switches
covered in this guide:
■ Normal traffic flow to the mirror port is blocked when mirroring is
enabled.
■ If IGMP snooping is enabled, IGMP packets cannot be mirrored.
■ The mirror port always has traffic tagged if the mirror port is not in the
same VLAN as the monitored port.
Displaying the Monitoring Configuration. This command lists the port
assigned to receive monitored traffic and the ports and/or trunks being
monitored.
Syntax: show monitor
For example, if you assign port A6 as the monitoring port and configure the
switch to monitor ports A1 - A3, show monitor displays the following:
Figure B-21. Example of Monitored Port Listing
show monitor
mirror-port
monitor
below
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Port receiving monitored traffic.
Monitored Ports