External alarm contacts allow network devices to monitor physical conditions such as door sensors, temperature sensors, or other environmental monitoring equipment. These sensors can trigger alarms at different severity levels when detecting changes.

Switch# configure terminal
Switch(config)# alarm contact 1 description door sensor
Switch(config)# alarm contact 1 severity major
Switch(config)# alarm contact 1 trigger closed
Switch(config)# end

Switch# show env alarm-contact
ALARM CONTACT 1
Status: not asserted
Description: door sensor
Severity: major
Trigger: closed
ALARM CONTACT 2
Status: not asserted
Description: external alarm contact 2
Severity: minor
Trigger: closed

The following commands are used to configure temperature alarm associations:

Switch# configure terminal
Switch(config)# alarm facility temperature secondary high 45
Switch(config)# alarm facility temperature secondary relay major
Switch(config)# alarm facility temperature secondary syslog
Switch(config)# alarm facility temperature secondary notifies

This configuration assigns the primary temperature alarm to the major relay. All alarms and traps related to this alarm are sent to a syslog server..

Switch(config)# alarm facility temperature primary syslog
Switch(config)# alarm facility temperature primary relay major

Configuration commands

This example demonstrates how to configure two power supplies:

Switch# enable
Switch# configure terminal
Switch(config)# power-supply dual

Verification commands

These examples show how to display information when two power supplies are absent, resulting in an alarm that is triggered.

Note	The show facility-alarm status command displays information when two power supplies are absent, resulting in a triggered alarm

Switch# show facility-alarm status
Source Severity Description Relay Time
Switch MAJOR 5 Redundant Pwr missing or failed NONE Mar 01
1993 00:23:52

Switch# show env power
POWER SUPPLY A is DC OK
POWER SUPPLY B is DC FAULTY <--

Switch# show hard led
SWITCH: 1
SYSTEM: GREEN
ALARM : ALT_RED_BLACK <--