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Remote 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 .
Remote SPAN
The Remote SPAN (RSPAN) feature enables you to remotely monitor traffic for one or more SPAN
sources distributed in one or more source switches in a Fibre Channel fabric. The SPAN destination (SD)
port is used for remote monitoring in a destination switch. A destination switch is usually different from
the source switch(es) but is attached to the same Fibre Channel fabric. You can replicate and monitor
traffic in any remote Cisco MDS 9000 Family switch or director, just as you would monitor traffic in a
Cisco MDS source switch.
The RSPAN feature is nonintrusive and does not affect network traffic switching for that SPAN source
ports. Traffic captured on the remote switch is tunneled across a Fibre Channel fabric which has trunking
enabled on all switches in the path from the source switch to the destination switch. The Fibre Channel
tunnel is structured using trunked ISL (TE) ports. In addition to TE ports, the RSPAN feature uses two
other interface types (see
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Figure 43-8
VSAN 2
Advantages to Using RSPAN
The RSPAN features has the following advantages:
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Cisco MDS 9000 Family Configuration Guide
43-16
Figure
SD ports—A passive port from which remote SPAN traffic can be obtained by the FC analyzer.
ST ports—A SPAN tunnel (ST) port is an entry point port in the source switch for the RSPAN Fibre
Channel tunnel. ST ports are special RSPAN ports and cannot be used for normal Fibre Channel
traffic.
RSPAN Transmission
Cisco MDS 9000 switch
Source swtich
ST port
Enables nondisruptive traffic monitoring at a remote location.
Provides a cost effective solution by using one SD port to monitor remote traffic on multiple
switches.
Works with any Fibre Channel analyzer.
Is compatible with the Cisco MDS 9000 Port Analyzer adapters.
Does not affect traffic in the source switch, but shares the ISL bandwidth with other ports in the
fabric.
Chapter 43
43-8):
RSPAN
encapsulated
frame
Cisco
MDS 9000
Fibre
Channel
fabric
trunking
enabled
on each
switch
Monitoring Network Traffic Using SPAN
Cisco MDS 9000 switch
Destination swtich
TE port
VSAN 2
SD port
FC analyzer
OL-6973-03, Cisco MDS SAN-OS Release 2.x
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