Sets interval, threshold (maximum number of link down events), and disable time values for link-flap detection.
| ports | Physical ports. |
| port_list | List of ports to activate link-flap detection upon. |
| all | Sets link-flap detection characteristics on all ports in the system. |
| interval | Sets time interval for collecting link-flap events. |
| interval | Interval value in seconds. Default is 5 seconds. Range is 1 second to indefinitely. |
| indefinitely | Accumulate link-flap instances forever. |
| threshold | Sets number of link-flap events tolerated before action is taken. |
| threshold | Threshold value. Default is 10. Minimum threshold is 1; maximum threshold value depends on the link-flap detection configured link-flap interval and the link scan interval. |
| disable-time | Sets time period a port remains disabled after detecting excessive link flapping. |
| disable_time | Disable time in seconds. Default is 300 seconds. Range is 1 seconds to until enabled by user. |
| until-cleared | Port remains down until you issue clear ports [port_list | all] link-flap-detection status command. |
| Option | Default Value |
|---|---|
| Interval | 5 seconds |
| Threshold | 10 link flaps |
| Disable time | 300 seconds |
If the default link-scan interval is 50 ms, then in 1 second, a maximum of 20 link state transitions (up or down) and 10 link down transitions can be detected. Assuming the link-flap interval is set to 5, the maximum link-flap threshold is 10 * 5 = 50. Maximum threshold for interval of 10 seconds appears in the output of the show ports all link-flap configuration command.
configure ports 7 link-flap-detection interval 5 configure ports 7 link-flap-detection threshold 200 Error: Maximum threshold is 100 for port 7 for current configuration of link-flap interval of 5 seconds.
configure ports 7 link-flap-detection threshold 100 configure ports 7 link-flap-detection interval 2 Error: Current threshold of 100 for port 7 is invalid with new interval value of 2 seconds. Threshold must be less than 40 for interval to be 2 seconds.
The following example sets the threshold value to 15 link flaps that can be accumulated in an infinite interval for all ports.
configure ports all link-flap-detection interval indefinitely threshold 15
This command was first available in ExtremeXOS release 22.1.
This command is available on the ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, and X870 series switches.