Manually Configuring Master and Backup Routing Engines ! 481
Chapter 36: Host Redundancy Overview
Sample Output
user@host>
show chassis routing-engine
Routing Engine status:
Slot 0:
Current state Backup
Election priority Backup (default)
Temperature 26 degrees C / 78 degrees F
DRAM 2048 MB
Memory utilization 12 percent
CPU utilization:
User 0 percent
Background 0 percent
Kernel 1 percent
Interrupt 0 percent
Idle 99 percent
Serial ID 210929000142
Start time 2004-05-12 13:14:30 PDT
Uptime 5 days, 22 hours, 7 minutes, 9 seconds
Load averages: 1 minute 5 minute 15 minute
0.07 0.02 0.00
Routing Engine status:
Slot 1:
Current state Master
Election priority Master (default)
Temperature 27 degrees C / 80 degrees F
DRAM 2048 MB
Memory utilization 13 percent
CPU utilization:
User 0 percent
Background 0 percent
Kernel 0 percent
Interrupt 0 percent
Idle 100 percent
Serial ID 210929000143
Start time 2004-04-05 17:08:41 PDT
Uptime 42 days, 18 hours, 12 minutes, 45 seconds
What It Means Each Routing Engine only checks its own configuration. Therefore, you must
configure the redundancy settings on both Routing Engines correctly for the system
to operate properly.
If both Routing Engines are configured as master, whichever Routing Engine comes
up first will be the master. When the second Routing Engine comes up, it will try to
assume mastership. However, the current master Routing Engine will reject this
request, and the second Routing Engine will become the backup.
If both Routing Engines are configured as backup and come up after bootup,
neither Routing Engine becomes master. The only way for either to become master
is if one of the host module components (such as the Routing Engine) is physically
removed, or if a Routing Engine has
failover on-loss-of-keepalives configured and the
connection between Routing Engines is interrupted for a period of time. The
resulting timeout due to a loss of keepalives will force one of the Routing Engines to
become the master. See “Configuring the Backup Routing Engine to Assume
Mastership on Failure of Keepalives” on page 486 for more information.
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