Purge-time for OpenFlow
You can configure the maximum time before stale flows are purged from the OpenFlow
flow table after a switch-over, fail-over, or operating system upgrade. The no form
of this command sets the purge timer time to its default value.
The valid range is from 1 through 600. The default is 240 seconds.
You may not need to change the value of the OpenFlow purge timer for normal circumstances. If you anticipate delay in learning the flows from controller after switch-over, you can configure a larger value for the OpenFlow purge timer.