C
HAPTER
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| Port Mirroring Commands
Local Port Mirroring Commands
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â—† When enabled for an interface, default mirroring is for both received
and transmitted packets.
COMMAND MODE
Interface Configuration (Ethernet, destination port)
COMMAND USAGE
â—† 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.
â—† 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.
â—† When mirroring traffic from a port, the mirror port and monitor port
speeds should match, otherwise traffic may be dropped from the
monitor port.
â—† Spanning Tree BPDU packets are not mirrored to the target port.
â—† You can create multiple mirror sessions, but all sessions must share the
same destination port.
EXAMPLE
The following example configures the switch to mirror all packets from port
6 to 11:
Console(config)#interface ethernet 1/11
Console(config-if)#port monitor ethernet 1/6 both
Console(config-if)#
show port monitor This command displays mirror information.
SYNTAX
show port monitor [interface]
interface - ethernet unit/port (source port)
unit - Stack unit. (Range: 1)
port - Port number. (Range: 1-24)
DEFAULT SETTING
Shows all sessions.
COMMAND MODE
Privileged Exec
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