Fault-Finder Link-Flap - HP Aruba JL253A Management And Configuration Manual

When the link-flap threshold is met for a port configured for warn (For example, fault-finder link-flap
sensitivity medium action warn), the following message is seen in the switch event log.
02672 FFI: port <number>-Excessive link state transitions
When the link-flap threshold is met for a port configured for warn-and-disable (For example, fault-finder
linkflap sensitivity medium action warn-and-disable), the following messages are seen in the
switch event log.
02672 FFI: port <number>-Excessive link state transitions
02673 FFI: port <number>-Port disabled by Fault-finder.
02674 FFI: port <number>-Administrator action required to re-enable.
The warn-and-disable action is available for all fault-finder events on an individual basis. It may be used, For
example, to disable a port when excessive broadcasts are received. Because the fault-generated disabling of a
port requires operator intervention to re-enable the port, such configuration should be used with care. For
example, link-flap-initiated disablement is not desired on ports that are at the client edge of the network, because
link state changes there are frequent and expected.
Hewlett Packard Enterprise does not recommend automatic disabling of a port at the core or distribution layers
when excessive broadcasts are detected, because of the potential to disable large parts of the network that may
be uninvolved and for the opportunity to create a denial-of-service attack.

Fault-finder link-flap

Syntax
In the config context:
[no] fault-finder link-flap [ethernet] PORT-LIST action warn | warn-and-disable SECONDS sensitivity low | medium | high
Description
Configures the link-flap on a port. The default value is warn.
Options
link-flap
Configure link-flap control.
warn
Log the event only.
warn-and-disable
Log the event and disable the port.
seconds
Re-enable the port after waiting for the specified number of seconds. The default value is 0, which indicates
that the port will not be automatically enabled.
sensitivity
Indicate the sensitivity of the link-flap control threshold within a 10-second interval.
• Low indicates 10 link-flaps.
• Medium indicates 6 link-flaps.
• High indicates 3 link-flaps.
Parameters
Chapter 13 Troubleshooting 475