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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 3 Configuring Catalyst 2955 Switch Alarms
Configuring Catalyst 2955 Switch Alarms
Setting the FCS Error Threshold
The switch generates an FCS bit error rate alarm when the actual FCS bit error rate is close to the
configured FCS bit error rate. Use the fcs-threshold interface configuration command to set the FCS
error threshold.
Beginning in privileged EXEC mode, follow these steps to set the bit error rate value for a port:
Use the no fcs-threshold interface configuration command to return to the default FCS threshold value.
This example shows how to set the FCS bit error rate for a port to 10
-10
Switch# configure terminal
Switch(config)# interface fastethernet0/1
Switch(config-if) # fcs-threshold 10
Setting the FCS Error Hysteresis Threshold
The hysteresis setting prevents the toggle of an alarm when the actual bit error rate fluctuates near the
configured bit error rate. Use the alarm facility fcs-hysteresis global configuration command to set the
FCS error hysteresis threshold.
Note The FCS hysteresis threshold is applied to all ports of a Catalyst 2955 switch.
Beginning in privileged EXEC mode, follow these steps to set the FCS error hysteresis threshold for a
switch:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter the interface to be configured, and enter interface configuration mode.
Step 3
fcs-threshold value Set the FCS error rate.
For value, the range is 6 to 11 to set a maximum bit error rate of 10
-6
to 10
-11
.
By default, the FCS bit error rate is 10
-8
.
Step 4
end Return to privileged EXEC mode.
Step 5
show fcs-threshold Verify the setting.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
alarm facility fcs-hysteresis
percentage
Set the hysteresis percentage for the switch.
For percentage, the range is 1 to 10. The default value is 10 percent.
Step 3
end Return to privileged EXEC mode.
Step 4
show running config Verify the configuration.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.