Chapter 33: Monitoring the HCM
Alternative Action Look at the Routing Engine LEDs by using the show chassis routing-engine CLI command or by looking at the component faceplate at the front of the router. The
Routing Engine has four LEDs that tell operating status: agreen LED labeled HDD , a blue LED labeled MASTER , a red LED labeled FAIL , and a green LED labeled ONLINE .
Table 102 describes the Routing Engine LED states.
Table 102: Routing Engine LEDs
Label
HDD
MASTER
FAIL
ONLINE
Color
Green
Blue
Red
Green
State
Blinking
On steadily
On steadily
On steadily
Description
There is read/write activity on the PC card.
Routing Engine is functioning as master.
Routing Engine is not operational..
Routing Engine is running normally.
Displaying HCM Alarms
If a router with a single HCM fails, no alarm can be sent. If a master HCM fails on a router with dual HCMs and the backup HCM takes over mastership, an alarm is reported on the backup Routing Engine.
When HCM mastership changes because of failure, Routing Engine mastership changes as well.
Action To view HCM alarms, use the following CLI command: user@host> show chassis alarms
Sample Output user@host> show chassis alarms
4 alarms currently active
Alarm time Class Description
2005-02-16 22:10:27 UTC Minor Backup RE Active
What It Means The command output displays a minor alarm indicating that the backup Routing
Engine is active or is master. Since the HCM is a companion component of the
Routing Engine, the backup HCM is also active. The command output displays the date and time of the alarm.
To verify that the backup HCM has taken over mastership, use the show chassis routing-engine CLI command. user@host> show chassis routing-engine
Sample Output user@host> show chassis routing-engine
Routing Engine status:
Slot 0:
Current state Backup
Election priority Master (default)
Temperature 33 degrees C / 91 degrees F
DRAM 2048 MB
Memory utilization 13 percent
CPU utilization:
User 0 percent
Background 0 percent
Displaying HCM Alarms !
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