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
26-11
Cisco MDS 9000 Family CLI Configuration Guide
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Chapter 26 Managing FLOGI, Name Server, FDMI, and RSCN Databases
RSCN
Note
The RSCN timer value must be the same on all switches in the VSAN. See the
“RSCN Timer
Configuration Distribution” section on page 26-11
.
Note
Before performing a downgrade, make sure that you revert the RCSN timer value in your network to the
default value. Failure to do so will disable the links across your VSANs and other devices.
To configure the RSCN timer, follow these steps:
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
Chapter 6, “Using the CFS Infrastructure.”
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.
Command
Purpose
Step 1
switch#
config t
switch(config)#
Enters configuration mode.
Step 2
switch(config)#
rscn distribute
Enables RSCN timer configuration distribution.
Step 3
switch(config)#
rscn event-tov 300 vsan 10
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.
switch(config)#
no rscn event-tov 300 vsan 10
Reverts to the default value (2000 milliseconds
for Fibre Channel VSANs or 1000 milliseconds
for FICON VSANs).
Step 4
switch(config)#
rscn commit vsan 10
Commits the RSCN timer configuration to be
distributed to the switches in VSAN 10.