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Alarms

 

System Alarms

Switches provide predefined system alarms that can be triggered by a missing rescue configuration, failure to install a license for a licensed software feature, or high disk usage. You can display alarm messages by issuing the show system alarms operational mode command.

For example: The switch might trigger an alarm when disk usage in the /var partition exceeds 75 percent. A usage level between 76 and 90 percent indicates high usage and raises a minor alarm condition, whereas a usage level above 90 percent indicates that the partition is full and raises a major alarm condition.

The following sample output shows the system alarm messages that are displayed when disk usage is exceeded on the switch.

user@host> show system alarms
Best Practice

We recommend that you regularly request a system file storage cleanup to optimize the performance of the switch and prevent generating system alarms.

Configuring Junos OS to Determine Conditions That Trigger Alarms on Different Interface Types

For the different types of PICs, you can configure which conditions trigger alarms and whether they trigger a red or yellow alarm. Red alarm conditions light the RED ALARM LED and trigger an audible alarm if one is connected. Yellow alarm conditions light the YELLOW ALARM LED and trigger an audible alarm if one is connected.

Note

By default, any failure condition on the integrated-services interface (Adaptive Services PIC) triggers a red alarm.

To configure conditions that trigger alarms and that can occur on any interface of the specified type, include the alarm statement at the [edit chassis] hierarchy level.

alarm-name is the name of an alarm.

System-Wide Alarms and Alarms for Each Interface Type

Table 1 lists the system-wide alarms and the alarms for each interface type.

Table 1: Configurable PIC Alarm Conditions

Interface/System

Alarm Condition

Configuration Option

SONET/SDH and ATM

Link alarm indication signal

ais-l

Path alarm indication signal

ais-p

Signal degrade (SD)

ber-sd

Signal fail (SF)

ber-sf

Loss of cell delineation (ATM only)

locd

Loss of framing

lof

Loss of light

lol

Loss of pointer

lop-p

Loss of signal

los

Phase-locked loop out of lock

pll

Synchronous transport signal (STS) payload label (C2) mismatch

plm-p

Line remote failure indication

rfi-l

Path remote failure indication

rfi-p

STS path (C2) unequipped

uneq-p

E3/T3

Alarm indicator signal

ais

Excessive numbers of zeros

exz

Failure of the far end

ferf

Idle alarm

idle

Line code violation

lcv

Loss of frame

lof

Loss of signal

los

Phase-locked loop out of lock

pll

Yellow alarm

ylw

Ethernet

Link has gone down

link-down

DS1

Alarm indicator signal

ais

Yellow alarm

ylw

Integrated services

Hardware or software failure

failure

Management Ethernet

Link has gone down

link-down