C H A P T E R 3 Configuring Catalyst 2955 Switch Alarms; Global Status Monitoring Alarms; Fcs Error Hysteresis Threshold - Cisco 2950 - Catalyst Switch Configuration Manual

Understanding Catalyst 2955 Switch Alarms

Global Status Monitoring Alarms

The Catalyst 2955 switch contains facilities for processing alarms related to temperature and power
supply conditions. These are referred to as global or facility alarms.
alarms and their descriptions and functions.
Table 3-1 Catalyst 2955 Global Status Monitoring Alarms
Alarm
Power Supply Alarm
Temperature Alarms

FCS Error Hysteresis Threshold

The Ethernet standard calls for a maximum bit error rate of 10
rate configurable range is from 10
If you want to configure the bit error rate of 10
the FCS bit error rate is 10
You can set the FCS error hysteresis threshold to prevent the toggle of the alarm when the actual bit error
rate fluctuates near the configured bit error rate. The hysteresis threshold is defined as the ratio between
the alarm clear threshold to the alarm set threshold, expressed as a percentage value.
For example, if the FCS bit error rate alarm value is configured to 10
threshold. To set the alarm clear threshold at 5*10
h = alarm clear threshold / alarm set threshold
h = 5*10
The FCS hysteresis threshold is applied to all ports on the Catalyst 2955 switch. The allowable range is
from 1 to 10 percent. The default value is 10 percent. See the
Alarm" section on page 3-7
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
3-2
Description
The switch monitors dual DC power supply levels. If the system is configured to operate in a dual
power mode, an alarm triggers if a power supply fails or is missing. The alarm is automatically
cleared when both power supplies are present or working. You can configure the power supply
alarm to be connected to the hardware relays. For more information, see the
Power Supply Alarm" section on page
The switch contains a temperature sensor that monitors the environmental conditions inside the
switch. The switch contains two alarms that are associated with temperature.
The primary alarm is enabled automatically to trigger both at a low temperature (-20
•
o
high temperature (95 C) for the safe operation of the switch. It cannot be changed or disabled.
By default, the primary temperature alarm is associated with the major relay.
• You can use the secondary temperature alarm to trigger an alarm when the system temperature
is greater than the configured temperature threshold. The lower threshold is configurable
within the range of 40
default.
For more information, see the
-8
.
-10 -8 -2
/ 10 = 5*10 = 0.05 = 5 percent
for more information.
3-5.
o
C to the maximum threshold, 95
"Configuring the Switch Temperature Alarms" section on page
-6 -11
to 10 . The bit error rate input to the switch is a positive exponent.
-9
, then you enter the value 9 for the exponent. By default,
-10
, the hysteresis, value h, is determined as follows:
Chapter 3 Configuring Catalyst 2955 Switch Alarms
Table 3-1 lists the three global
"Configuring the
o
C. The secondary alarm is disabled by
-8
. In the Catalyst 2955 switch, the bit error
–8
, that value is the alarm set
"Configuring the FCS Bit Error Rate
o
C) and a
3-6.
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