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About SPAN
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
About SPAN
The 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 (see
Fabric Analyzer" section on page
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 (see
Figure
Figure 43-1
Fibre Channel traffic
Cisco MDS 9000 Family Configuration Guide
43-2
43-1).
SPAN Transmission
SPAN source port
fc3/1
Cisco MDS 9000 switch
Chapter 43
49-4).
Fibre Channel traffic
fc1/2
Fibre Channel analyzer
fc9/1
SD port
Monitoring Network Traffic Using SPAN
"Configuring a
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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