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Chapter 43
Monitoring Network Traffic Using 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 .
FC and RSPAN Tunnels
An FC tunnel is a logical data path between a source switch and a destination switch. The FC tunnel
originates from the source switch and terminates at the remotely located destination switch.
RSPAN uses a special Fibre Channel tunnel (FC tunnel) that originates at the ST port in the source switch
and terminates at the SD port in the destination switch. You must bind the FC tunnel to an ST port in the
source switch and map the same FC tunnel to an SD port in the destination switch. Once the mapping
and binding is configured, the FC tunnel is referred to as an RSPAN tunnel (see
Figure 43-9
VSAN 2
Guidelines to Configure RSPAN
The following guidelines apply for a SPAN configuration:
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•
•
•
•
•
OL-6973-03, Cisco MDS SAN-OS Release 2.x
FC and RSPAN Tunnel
Cisco MDS 9000 switch
Source swtich
ST port
All switches in the end-to-end path of the RSPAN tunnel must belong to the Cisco MDS 9000
Family.
All VSANs with RSPAN traffic must be enabled. If a VSAN containing RSPAN traffic is not
enabled, it is dropped.
The following configurations must be performed on each switch in the end-to-end path of the Fibre
Channel tunnel in which RSPAN is to be implemented
–
Trunking must be enabled (enabled by default).
VSAN interface must be configured.
–
The Fibre Channel tunnel feature must be enabled (disabled by default).
–
IP routing must be enabled (disabled by default).
–
If the IP address is in the same subnet as the VSAN, the VSAN interface does not have to
Note
be configured for all VSANs on which the traffic is spanned.
A single Fibre Channel switch port must be dedicated for the ST port functionality.
Do not configure the port to be monitored as the ST port.
The FC tunnel's IP address must reside in the same subnet as the VSAN interface
See
Chapter 36, "Configuring IP Services."
Cisco MDS 9000 switch
TE port
Cisco MDS
Fibre
Channel
fabric
VSAN 2
FC tunnel
SD port
RSPAN tunnel
Cisco MDS 9000 Family Configuration Guide
Remote SPAN
Figure
43-9).
Destination swtich
FC analyzer
43-17
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