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58.1 Introduction to Mirror
Mirror functions include port mirror function, CPU mirror function, flow mirror function.
Port mirror refers to the duplication of data frames sent/received on a port to another port. The duplicated port
is referred to as mirror source port and the duplicating port is referred to as mirror destination port. A protocol
analyzer (such as Sniffer) or a RMON monitor will be connected at mirror destination port to monitor and
manage the network, and diagnose the problems in the network.
CPU mirror function means that the switch exactly copies the data frames received or sent by the CPU to a
port. Flow mirror function means that the switch exactly copies the data frames received by the specified rule
of a port to another port. The flow mirror will take effect only the specified rule is permit.
Switch supports one mirror destination port only. There is no limitation on mirror source ports, one port or
several ports is allowed. When there are more than one source ports, they can be in the same VLAN or in
different VLAN. The source port and destination port can be in different VLAN.
58.2 Mirror Configuration Task List
1. Specify mirror destination port
2. Specify mirror source port (CPU)
3. Specify flow mirror source
1. Specify mirror destination port
Command
Global mode
monitor session <session> destination
interface <interface-number>
no monitor session <session> destination
interface <interface-number>
2. Specify mirror source port（CPU）
Command
Global mode
Chapter 58 Mirror Configuration
58-32
Explanation
Specifies mirror destination port; the no
command deletes mirror destination source
port.
Explanation
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