About Span - Cisco DS-C9216I-K9 Configuration Manual

Monitoring Network Traffic Using SPAN
This chapter describes the switched port analyzer (SPAN) features provided in switches in the Cisco
MDS 9000 Family. It includes the following sections:
This chapter contains the following topics:
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About SPAN

The switched port analyzer (SPAN) feature is specific to switches in the Cisco MDS 9000 Family. It
monitors network traffic though a Fibre Channel interface. Traffic through any Fibre Channel interface
can be replicated to a special port called the SPAN destination port (SD port). Any Fibre Channel port
in a switch can be configured as an SD port. Once an interface is in SD-port mode, it cannot be used for
normal data traffic. You can attach a Fibre Channel Analyzer to the SD port to monitor SPAN traffic.
SD ports do not receive frames, they merely transmit a copy of the SPAN source traffic. The SPAN
feature is non-intrusive and does not affect switching of network traffic for any SPAN source ports.
OL-7753-01
About SPAN, page 30-1
SPAN Sources, page 30-2
SPAN Sessions, page 30-5
Creating SPAN Sessions, page 30-5
Editing SPAN Sources, page 30-5
Deleting SPAN Sessions, page 30-6
Specifying Filters, page 30-6
SD Port Characteristics, page 30-7
Monitoring Traffic Using Fibre Channel Analyzers, page 30-7
Default SPAN Settings, page 30-10
Remote SPAN, page 30-10
C H A P T E R
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
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