The example below shows that regular updates are sent every 30 seconds and it's been 7 seconds since the last update, so the next update will ocurr in 23 seconds.
Flash Updates sends a new update as soon as a route fails. When the command "flash-update-threshold 10" is inserted, this means that the flash update will be suppressed if the next regular update is due in either 10 seconds or less. As the regular update is less than 10 seconds away no point in sending another flash update avoiding multiple updates from happening.
The default value of a Flash update is 5 seconds.
from: Cisco IOS IP Routing: RIP Command Reference
flash-update-threshold
To suppress regularly scheduled flash updates, use the flash-update-threshold command in router configuration mode. To return to the default state, use the no form of this command.
flash-update-threshold seconds
no flash-update-threshold
Syntax Description
|
| The time interval in seconds for which the suppression of flash updates can be configured. The range is from 1 to 30 seconds. |
Defaults
This command is disabled by default.
Command Modes
Router configuration
Command History
| Release | Modification |
|---|
| 12.0 | This command was introduced. |
| 12.2(33)SRA | This command was integrated into Cisco IOS Release 12.2(33)SRA. |
| 12.2SX | This command is supported in the Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends on your feature set, platform, and platform hardware. |
Usage Guidelines
This command suppresses flash updates when the arrival of a regularly scheduled update matches the number of seconds that is configured with theseconds argument. The range of seconds that can be configure is from 0 to 30 seconds. If the number of seconds matches the number of seconds or is less than the number seconds that is configured with the seconds argument, the flash update is suppressed. If the numbers seconds until the flash update arrives exceeds the number of seconds that is configured with the seconds argument, the flash update is not suppressed. The regular scheduled interval for flash updates and the configuration of the suppression of flash updates can be verified with the show ip protocol command.
Examples
The following example configures a router to suppress a regularly scheduled flash update if the update is due in 10 seconds or less:
flash-update-threshold 10
Related Commands
| Command | Description |
| show ip protocols | Displays the parameters and current state of the active routing protocol process. |
