Avoid Redundancy Problems - Juniper M Series Monitoring And Troubleshooting Manual

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Avoid Redundancy Problems

Operate the Same Type of Routing Engine and Junos OS
Use the Groups Configuration
586
Every 20 seconds of keepalive loss, a message is added to the
file.
After keepalive-time passes, the backup Routing Engine attempts to claim mastership.
When the backup Routing Engine claims mastership, it continues to be master even
after the other Routing Engine configured as master has successfully resumed operation.
Therefore, if the backup Routing Engine claims mastership, you must manually switch
mastership.
The default time before failover will occur is set to 300 seconds (5 minutes). You can
change the default keepalive time period with the
command (the range for
time-in-seconds
Keepalive messages are sent every second.
Understanding Redundancy for the Routing Engine, Host Module, and Host Subsystem
on page 565
Problems with reliable redundancy are more often caused by poor management of
software rather than by hardware failure. The following operating guidelines reduce the
likelihood of significant downtime due to Routing Engine redundancy conflicts.
Operate the Same Type of Routing Engine and Junos OS on page 586
1.
Use the Groups Configuration on page 586
2.
3. Synchronize Configurations on page 588
Copy a Configuration File from One Routing Engine to Another on page 588
4.
Use the Proper Shutdown Process on a Backup Routing Engine on page 589
5.
The active and standby Routing Engines must be the same type of Routing Engine and
must operate the same version of Junos OS; otherwise, anomalies in operation can occur.
Apply a single configuration file to both Routing Engines using the
statement at the [ ] hierarchy level:
edit
[edit]
user@host# set groups group-name
Where is the name of the configuration group. To configure multiple groups,
group-name
specify more than one group name. On routers that support multiple Routing Engines,
you can also specify two special group names:
re0 —Configuration statements that are applied to the Routing Engine in slot 0.
—Configuration statements that are applied to the Routing Engine in slot 1.
re1
/var/log/mastership
set chassis redundancy keepalive-time
is from 2 to 10,000 seconds).
keepalive-time
groups group-name
Copyright © 2012, Juniper Networks, Inc.