User's Manual

Command Line Interface
4-178
4
Mirror Port Commands
This section describes how to mirror traffic from a source port to a target port.
port monitor
This command configures a mirror session. Use the no form to clear a mirror
session.
Syntax
port monitor interface [rx | tx]
no port monitor interface
• interface - ethernet unit/port (source port)
- unit - Stack unit. (Range: 1)
- port - Port number. (Range: 1-26/50)
• rx - Mirror received packets.
• tx - Mirror transmitted packets.
• both - Mirror both received and transmitted packets.
Default Setting
No mirror session is defined.
Command Mode
Interface Configuration (Ethernet, destination port)
Command Usage
• You can mirror traffic from any source port to a destination port for real-time
analysis. You can then attach a logic analyzer or RMON probe to the
destination port and study the traffic crossing the source port in a completely
unobtrusive manner.
• Set the destination port by specifying an Ethernet interface with the interface
configuration command, and then use the port monitor command to specify
the source of the traffic to mirror.
• When mirroring traffic from a port, the mirror port and monitor port speeds
should match, otherwise traffic may be dropped from the monitor port.
• You can create multiple mirror sessions, but all sessions must share the same
destination port.
Table 4-55 Mirror Port Commands
Command Function Mode Page
port monitor Configures a mirror session IC 4-178
show port monitor Shows the configuration for a mirror port PE 4-179