Verifying The Rscn Timer Configuration; Rscn Timer Configuration Distribution - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Chapter 27 Managing FLOGI, Name Server, FDMI, and RSCN Databases
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
The RSCN timer value must be the same on all switches in the VSAN. See the
Note
Configuration Distribution" section on page
Before performing a downgrade, make sure that you revert the RCSN timer value in your network to the
Note
default value. Failure to do so will disable the links across your VSANs and other devices.
To configure the RSCN timer, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# rscn distribute
Step 3
switch(config)# rscn event-tov 300 vsan 10
switch(config)# no rscn event-tov 300 vsan 10
Step 4
switch(config)# rscn commit vsan 10

Verifying the RSCN Timer Configuration

You verify the RSCN timer configuration using the show rscn event-tov vsan command.
switch# show rscn event-tov vsan 10
Event TOV : 1000 ms

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. See
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.
All configuration commands are not distributed. Only the rscn event-tov tov vsan vsan command is
Note
distributed.
OL-18084-01, Cisco MDS NX-OS Release 4.x
27-11.
Purpose
Enters configuration mode.
Enables RSCN timer configuration distribution.
Sets the event time-out value in milliseconds for
the selected VSAN. In this example the event
time-out value is set to 300 milliseconds for
VSAN 12. The range is 0 to 2000 milliseconds.
Setting a zero (0) value disables the timer.
Reverts to the default value (2000 milliseconds
for Fibre Channel VSANs or 1000 milliseconds
for FICON VSANs).
Commits the RSCN timer configuration to be
distributed to the switches in VSAN 10.
Chapter 7, "Using the CFS Infrastructure."
Cisco MDS 9000 Family CLI Configuration Guide
RSCN
"RSCN Timer
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