Cisco Nexus 5000 Series - Configuring the Rscn Timer; Verifying the Rscn Timer Configuration

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1-7
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1 Managing FLOGI, Name Server, FDMI, and RSCN Databases
RSCN
Configuring the RSCN Timer
RSCN maintains a per VSAN event list queue, where the RSCN events are queued as they are generated.
When the first RSCN event is queued, a per VSAN timer starts. Upon time-out, all the events are
dequeued and coalesced RSCNs are sent to registered users. The default timer values minimize the
number of coalesced RSCNs sent to registered users. Some deployments require smaller event timer
values to track changes in the fabric.
Note The RSCN timer value must be the same on all switches in the VSAN. See the “RSCN Timer
Configuration Distribution” section on page 1-8.
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, perform this task:
In this example the event time-out value is set to 300 milliseconds for VSAN 12.
switch# rscn event-tov 300 vsan 12
Verifying the RSCN Timer Configuration
You verify the RSCN timer configuration using the show rscn event-tov vsan command. The following
example shows how to clear the RSCN statistics for VSAN 10:
switch# show rscn event-tov vsan 10
Event TOV : 1000 ms
Command Purpose
Step 1
switch# configuration terminal
switch(config)#
Enters configuration mode.
Step 2
switch(config)# rscn distribute
Enables RSCN timer configuration distribution.
Step 3
switch(config)# rscn event-tov timeout vsan
vsan-id
Sets the event time-out value in milliseconds for
the specified VSAN. The range is 0 to 2000
milliseconds. Setting a zero (0) value disables the
timer.
switch(config)# no rscn event-tov timeout
vsan vsan-id
Reverts to the default value (2000 milliseconds
for Fibre Channel VSANs).
Step 4
switch(config)# rscn commit vsan vsan-id
Commits the RSCN timer configuration to be
distributed to the switches in the specified
VSAN.