для Cisco Cisco ASA for Nexus 1000V Series Switch

The seconds argument indicates the amount of time allowed for the delay in seconds. If this command 
is not configured, there is no delay, and the flow-create event is exported as soon as the flow is created. 
If the flow is torn down before the configured delay, the flow-create event is not sent; an extended flow 
teardown event is sent instead. 

To disable and reenable NetFlow-related syslog messages, perform the following steps:

Disable syslog messages that have become redundant because of NSEL.

Example:

ciscoasa(config)# logging flow-export-syslogs disable

Although you execute this command in global configuration mode, it is not stored in the 
configuration. Only the no logging message xxxxxx commands are stored in the configuration.

Reenable syslog messages individually, where xxxxxx is the specified syslog message that you want to 
reenable.

Example:

ciscoasa(config)# logging message 302013

Reenable all NSEL events at the same time.

Example:

ciscoasa(config)# logging flow-export-syslogs enable

To reset runtime counters, perform the following steps:

Reset all runtime counters for NSEL to zero.

Example: