Specifications

3-3
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 3 Configuring Catalyst 2955 Switch Alarms
Understanding Catalyst 2955 Switch Alarms
For example, if the FCS bit error rate alarm value is configured to 10
–8
, that value is the alarm set
threshold. To set the alarm clear threshold at 5*10
-10
, the hysteresis, value h, is determined as follows:
h = alarm clear threshold / alarm set threshold
h = 5*10
-10
/ 10
-8
= 5*10
-2
= 0.05 = 5 percent
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 “Configuring the FCS Bit Error Rate
Alarm” section on page 3-8 for more information.
Port Status Monitoring Alarms
The Catalyst 2955 switch can also monitor the status of the Ethernet ports and generate alarm messages
based on the alarms listed in Table 3-2. To save user time and effort, the switch supports changing alarm
configurations by using alarm profiles. You can create a number of profiles and assign one of these
profiles to each Ethernet port.
Alarm profiles provide a mechanism for you to enable or disable alarm conditions for a port and
associate the alarm conditions with one or both alarm relays. You can also use alarm profiles to set alarm
conditions to send alarm traps to an SNMP server and system messages to a syslog server. The alarm
profile defaultPort is applied to all interfaces in the factory configuration (by default).
Note You can associate multiple alarms to one relay or one alarm to both relays.
Table 3-2 lists the port status monitoring alarms and their descriptions and functions. Each fault
condition is assigned a severity level based on the Cisco IOS System Error Message Severity Level.
Table 3-2 Catalyst 2955 Port Status Monitoring Alarms
Alarm Description
Link Fault alarm The Catalyst 2955 switch generates a link fault alarm when there are problems with a port
physical layer that cause unreliable data transmission. A typical link fault condition is loss
of signal or clock. The link fault alarm is cleared automatically when the link fault
condition is cleared. The severity for this alarm is error condition, level 3.
Port not Forwarding
alarm
The switch generates a port not forwarding alarm when a port is not forwarding packets.
This alarm is cleared automatically when the port begins to forward packets. The severity
for this alarm is warning, level 4.
Port is not Operating
alarm
The switch generates a port is not operating alarm when it finds that a port is in a failed
state during the startup self-test. When triggered, the port is not operating alarm is only
cleared when the switch is restarted and the port is found to be operational. The severity
for this alarm is error condition, level 3.
FCS Bit Error Rate alarm 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. You can set the FCS bit error rate by using the
interface configuration CLI for each of the ports. See the “Configuring the FCS Bit Error
Rate Alarm” section on page 3-8 for more information. The severity for this alarm is error
condition, level 3.