Configuring The Rscn Timer - Cisco Nexus 5000 Series Configuration Manual

Managing FLOGI, Name Server, FDMI, and RSCN Databases
The following example shows how to clear the RSCN statistics for the specified VSAN:
switch# clear rscn statistics vsan 1
After clearing the RSCN statistics, you can view the cleared counters by entering the show rscn statistics
command:
switch# show rscn statistics vsan 1

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.
The RSCN timer value must be the same on all switches in the VSAN.
Note
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, perform this task:
SUMMARY STEPS
1. switch# configuration terminal
2. switch(config)# rscn distribute
3. switch(config)# rscn event-tov timeout vsan vsan-id
4. switch(config)# no rscn event-tov timeout vsan vsan-id
5. switch(config)# rscn commit vsan vsan-id
DETAILED STEPS
Command or Action
Step 1 switch# configuration terminal
Step 2 switch(config)# rscn distribute
Step 3
switch(config)# rscn event-tov timeout vsan
vsan-id
Step 4 switch(config)# no rscn event-tov timeout vsan
vsan-id
OL-xxxxx-xx
Purpose
Enters configuration mode.
Enables RSCN timer configuration distribution.
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.
Reverts to the default value (2000 milliseconds for Fibre Channel
VSANs).
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide
RSCN
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