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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Appendix A Catalyst 2955 Alarm Commands
alarm facility fcs-hysteresis
alarm facility fcs-hysteresis
Use the alarm facility fcs-hysteresis global configuration command to set the frame check sequence
(FCS) error hysteresis threshold as a percentage of fluctuation from the FCS bit error rate. Use the no
form of this command to set the FCS error hysteresis threshold to its default value.
alarm facility fcs-hysteresis percentage
no alarm facility fcs-hysteresis percentage
Syntax Description
Defaults The default threshold-value is 10 percent.
Command Modes Global configuration
Command History
Usage Guidelines Set a hysteresis threshold to prevent an alarm from triggering when the FCS bit error rate fluctuates near
the configured bit error rate.
You set the FCS hysteresis threshold for all ports on the switch; you set the FCS error rate on a per-port
basis by using the fcs-threshold interface configuration command.
If the threshold is not the default, it appears in the output of the show running-config privileged EXEC
command.
Examples This example shows how to set the FCS error hysteresis to 5 percent. The alarm is not triggered unless
the bit error rate is more than 5 percent from the configured FCS bit error rate.
Switch(config)# alarm facility fcs-hysteresis 5
Related Commands
percentage Hysteresis threshold fluctuation. The range is 1 to 10 percent.
Release Modification
12.1(12c)EA1 This command was introduced.
Command Description
fcs-threshold Sets an FCS error rate for an interface.
show running-config Displays the running configuration on the switch, including FCS hysteresis
threshold if it is not set at the default. For syntax information, see the Cisco
IOS Configuration Fundamentals Command Reference for Release 12.1 >
Cisco IOS File Management Commands > Configuration File Commands.
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