Setting Port Link Traps and Link Flap Detection
Enterasys C3 Configuration Guide 11-23
Setting Port Link Traps and Link Flap Detection
Purpose
To disable or re-enable link traps, display link trap status, and to configure the link flapping
detection function. By default, all ports are enabled to send SNMP trap messages indicating
changes to their link status (up or down).
The link flap function detects when a link is going up and down rapidly (also called “link
flapping”) on a physical port, and takes the required actions (disable port, and eventually send
notification trap) to stop such a condition. If left unresolved, the “link flapping” condition can be
detrimental to network stability because it can trigger Spanning Tree and routing table
recalculation.
Commands
show port trap
Use this command to display whether the port is enabled for generating an SNMP trap message if
its link state changes.
Syntax
show port trap [port-string]
Parameters
For information about... Refer to page...
show port trap 11-23
set port trap 11-24
show linkflap 11-24
set linkflap globalstate 11-27
set linkflap portstate 11-27
set linkflap interval 11-28
set linkflap action 11-28
clear linkflap action 11-29
set linkflap threshold 11-30
set linkflap downtime 11-30
clear linkflap down 11-31
clear linkflap 11-31
show newaddrtrap 11-32
set newaddrtrap 11-32
port-string (Optional) Displays link trap status for specific port(s). For a detailed
description of possible port-string values, refer to “Port String Syntax Used
in the CLI” on page 11-1.
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