Fspf Global Configuration; About Spf Computational Hold Times; About Link State Record Defaults - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

FSPF Global Configuration

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
Table 25-2
PortChannel Scenario
Switch 1
~0 msec (~8 frame
drops)
No hold time needed
FSPF Global Configuration
By default, FSPF is enabled on switches in the Cisco MDS 9000 Family.
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.
FSPF is enabled by default. Generally, you do not need to configure these advanced features.
Note
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:
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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.

About Link State Record Defaults

Each time a new switch enters the fabric, a link state record (LSR) is sent to the neighboring switches,
and then flooded throughout the fabric.
Cisco MDS 9000 Family CLI Configuration Guide
25-4
Shutting Down the Switch for the SmartBits Scenario
Switch 2
110 msec (~2K frame
drops)
Signal loss on switch 1
About SPF Computational Hold Times, page 25-4
About Link State Record Defaults, page 25-4
Configuring FSPF on a VSAN, page 25-5
Resetting FSPF to the Default Configuration, page 25-5
Enabling or Disabling FSPF, page 25-6
Clearing FSPF Counters for the VSAN, page 25-6
Chapter 25 Configuring Fibre Channel Routing Services and Protocols
FSPF Scenario (Equal cost ISL)
Switch 1
130+ msec (~4K frame drops)
No hold time needed
Table 25-3 displays the default settings for switch responses.
Switch 2
Signal loss on switch 1
OL-16184-01, Cisco MDS SAN-OS Release 3.x