Manual

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326
Chapter 36 Mirror Configuration
36.1 Introduction to Mirror
Mirror functions include port 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.
Flow mirror function means that the switch exactly copies the data frames received or by the
specified rule of a port to another port. The flow mirror will take effect only the specified rule is
permit.
A chassis switch supports at most 4 mirror destination ports, each boardcard allows a source
or destination port of a mirror session. At present, each box switch can set many mirror
sessions. 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.
36.2 Mirror Configuration Task List
1. Specify mirror destination port
2. Specify mirror source port
3. Specify flow mirror source
1. Specify mirror destination port
Command
Explanation
Global mode
monitor session <session> destination
interface <interface-number>
no monitor session <session> destination
interface <interface-number>
Specifies mirror destination port; the no
command deletes mirror destination source
port.
2. Specify mirror source port
Command
Explanation
Global mode
monitor session <session> source
Specifies mirror source port; the no command