The RSCN timer is registered with CFS during initialization and switchover. For high availability, if the
RSCN timer distribution crashes and restarts or a switchover occurs, it resumes normal functionality from the
state prior to the crash or switchover.
You can determine the compatibility when downgrading to an earlier Cisco MDS NX-OS release using show
incompatibility system command. You must disable RSCN timer distribution support before downgrading
to an earlier release.
Note
By default, the RSCN timer distribution capability is disabled and is compatible when upgrading from any
Cisco MDS SAN-OS release earlier than 3.0.
Note
For CFS distribution to operate correctly for the RSCN timer configuration, all switches in the fabric must
be running Cisco SAN-OS Release 3.0(1) or later, or Cisco NX-OS 4.1(1b).
Note
This section includes the following topics:
Enabling RSCN Timer Configuration Distribution
To enable RSCN timer configuration distribution, follow these steps:
Step 1 switch# config terminal
switch(config)#
Enters configuration mode.
Step 2 switch(config)# rscn distribute
Enables RSCN timer distribution.
Step 3 switch(config)# no rscn distribute
Disables (default) RSCN timer distribution.
Locking the Fabric
The first action that modifies the database creates the pending database and locks the feature in the VSAN.
Once you lock the fabric, the following situations apply:
• No other user can make any configuration changes to this feature.
• A copy of the configuration database becomes the pending database along with the first active change.
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
235
Managing FLOGI, Name Server, FDMI, and RSCN Databases
Enabling RSCN Timer Configuration Distribution
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