Specifications

Configuring Link Flap Detection
January 29, 2009 Page 2 of 4
Configuring Link Flap Detection
Basic Link Flap Detection Configuration
Procedure 1describesthebasicstepstoconfigurelinkflapdetectiononMatrixN‐Series,
SecureStack,D‐Series,G‐Series,andI‐Seriesdevices.
Refertothedevice’sCLIReferenceGuideorConfigurationGuide formoreinformationabouteach
command.
Note: You must be logged in to the Enterasys device with read-write access rights to use the
commands shown in this procedure.
Procedure 1 Link Flap Detection Configuration
Step Task Command(s)
1. In switch mode, enable ports for sending SNMP
trap messages when their link status changes.
By default, all ports on your Enterasys device
are enabled to send SNMP trap messages
indicating changes in their link status (up or
down).
set port trap port-string {enable |
disable}
2. Enable link flap detection either globally or on
specific ports. By default, link flap is disabled
globally.
set linkflap globalstate {disable |
enable}
set linkflap portstate {disable |
enable} [port-string]
3. (Optional) Set the time interval (in seconds) for
accumulating link flapping instances. By default,
this value is set to 10 seconds.
set linkflap interval port-string
interval_value
4. (Optional) Set the number of link flapping
instances necessary to trigger the link flap
action. By default, this value is five link flapping
instances.
set linkflap threshold port-string
threshold_value
5. (Optional) Set how the Enterasys device will
react to excessive link flapping:
• Disable the port
• Generate a Syslog entry
• Generate an SNMP trap message
• All of the above
By default, all of the above actions occur in
reaction to excessive link flapping.
set linkflap action port-string
{disableInterface | gensyslogentry |
gentrap | all}
To clear reactions to excessive link flapping, use
the clear command.
clear linkflap action [port-string]
{disableInterface | gensyslogentry |
gentrap | all}
6. (Optional) Set the time interval, in seconds, that
one or more ports will be disabled after
excessive link flapping. By default, this value is
300 seconds.
set linkflap downtime port-string
downtime_value