Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 40 Configuring Fibre Channel Routing Services and Protocols
FSPF Global Configuration
Figure 40-2 Fault Tolerant Fabric with Redundant Links
For example, if all links are of equal speed and no SAN port channels exist, the FSPF calculates four
equal paths from A to C: A1-E-C, A2-E-C, A3-D-C, and A4-D-C. If SAN port channels exist, these paths
are reduced to two.
FSPF Global Configuration
By default, FSPF is enabled on switches in the Cisco Nexus 5000 Series.
Some FSPF features can be globally configured in each VSAN. By configuring a feature for the entire
VSAN, you do not have to specify the VSAN number for every command. This global configuration
feature also reduces the chance of typing errors or other minor configuration errors.
Note FSPF is enabled by default. Generally, you do not need to configure these advanced features.
Caution The default for the backbone region is 0 (zero). You do not need to change this setting unless your region
is different from the default. If you are operating with other vendors using the backbone region, you can
change this default to be compatible with those settings.
This section includes the following topics:
• About SPF Computational Hold Times, page 40-3
• About Link State Records, page 40-4
• Configuring FSPF on a VSAN, page 40-4
• Resetting FSPF to the Default Configuration, page 40-5
• Enabling or Disabling FSPF, page 40-5
• Clearing FSPF Counters for the VSAN, page 40-5
About SPF Computational Hold Times
The SPF computational hold time sets the minimum time between two consecutive SPF computations
on the VSAN. Setting this to a small value means that FSPF reacts faster to any fabric changes by
recomputing paths on the VSAN. A small SPF computational hold time uses more switch CPU time.
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