C H A P T E R 51 Monitoring Network Traffic Using Span; About Span; Span Sources - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

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
through 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
Analyzer" section on page
SD ports do not receive frames, they only 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 51-1
Fibre Channel traffic

SPAN Sources

SPAN sources refer to the interfaces from which traffic can be monitored. You can also specify VSAN
as a SPAN source, in which case, all supported interfaces in the specified VSAN are included as SPAN
sources. You can choose the SPAN traffic in the ingress direction, the egress direction, or both directions
for any source interface:
•
Figure 51-2
Ingress source port
•
Cisco MDS 9000 Family CLI Configuration Guide
51-2
58-4.
51-1).
SPAN Transmission
SPAN source port
fc3/1
Cisco MDS 9000 switch
Ingress source (Rx)—Traffic entering the switch fabric through this source interface is spanned or
copied to the SD port (see
SPAN Traffic from the Ingress Direction
fc3/1
Cisco MDS 9000 switch
Egress source (Tx)—Traffic exiting the switch fabric through this source interface is spanned or
copied to the SD port (see
fc1/2
fc9/1
SD port
Figure 51-2).
fc1/2
fc9/1
SD port
Figure 51-3).
Chapter 51 Monitoring Network Traffic Using SPAN
Fibre Channel traffic
Fibre Channel analyzer
Fibre Channel traffic
Fibre Channel analyzer
OL-18084-01, Cisco MDS NX-OS Release 4.x
the"Cisco Fabric