Mirror Port Commands

4-115

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. U se 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 - Switch (unit 1).
-port - Port number.
•rx - Mirror received packets.
•tx - Mirror 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 i n a completely
unobtrusive manner.
• The destination port is set by specifying an Ethernet interface.
• The mirror port and moni tor port speeds should match, otherwise traffic may
be dropped from the monitor port.
• You can create mult iple mirror sessions, but all sessions must share the same
destination port. However, you should avoid sending too much traffic t o the
destination port from multiple source ports.
Table4-41. Mir ror Port Commands
Command Function Mode Page
port monitor Configures a mirro r session IC 4-115
show port monitor Shows the configuration for a mirror port PE 4-116