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 41 Managing FLOGI, Name Server, FDMI, and RSCN Databases
RSCN
RSCN Timer Configuration Distribution
Because the timeout value for each switch is configured manually, a misconfiguration occurs when
different switches time out at different times. This means different N-ports in a network can receive
RSCNs at different times. Cisco Fabric Services (CFS) infrastructure alleviates this situation by
automatically distributing the RSCN timer configuration information to all switches in a fabric. This also
reduces the number of SW-RSCNs. For additional information, see Chapter 21, “Using Cisco Fabric
Services.”
RSCN supports two modes, distributed and nondistributed. In distributed mode, RSCN uses CFS to
distribute configuration to all switches in the fabric. In nondistributed mode, only the configuration
commands on the local switch are affected.
Note All configuration commands are not distributed. Only the rscn event-tov tov vsan vsan command is
distributed.
Note Only the RSCN timer configuration is distributed.
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.
This section includes the following topics:
• Enabling RSCN Timer Configuration Distribution, page 41-8
• Locking the Fabric, page 41-8
• Committing the RSCN Timer Configuration Changes, page 41-9
• Discarding the RSCN Timer Configuration Changes, page 41-9
• Clearing a Locked Session, page 41-9
• Displaying RSCN Configuration Distribution Information, page 41-9
Enabling RSCN Timer Configuration Distribution
To enable RSCN timer configuration distribution, perform this task:
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.
Command Purpose
Step 1
switch# configuration terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)# rscn distribute
Enables RSCN timer distribution.
switch(config)# no rscn distribute
Disables (default) RSCN timer distribution.