Fspf Global Configuration; About Spf Computational Hold Times; About Link State Record Defaults - Cisco MDS 9000 Series Configuration Manual

FSPF Global Configuration

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.
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

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.
for switch responses.
Table 19: LSR Default Settings
LSR Option
Acknowledgment interval
(RxmtInterval)
Refresh time (LSRefreshTime)
Maximum age (MaxAge)
The LSR minimum arrival time is the period between receiving LSR updates on this VSAN. Any LSR updates
that arrive before the LSR minimum arrival time are discarded.
The LSR minimum interval time is the frequency at which this switch sends LSR updates on a VSAN.
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
188
Configuring Fibre Channel Routing Services and Protocols
Table 19: LSR Default Settings , on page 188
Default Description
5 seconds The time a switch waits for an acknowledgment from
the LSR before retransmission.
30 minutes The time a switch waits before sending an LSR refresh
transmission.
60 minutes The time a switch waits before dropping the LSR from
the database.
displays the default settings