1. After 2 seconds of keepalive loss, a message is logged.
2. After 2 seconds of keepalive loss, the backup Routing Engine attempts to assume
mastership. An alarm is generated whenever the backup Routing Engine is active, and
the display is updated with the current status.
3. Once the backup Routing Engine assumes mastership, it continues to function as
master even after the originally configured master Routing Engine has successfully
resumed operation. You must manually restore it to its previous backup status.
However, if at any time one of the Routing Engines is not present, the other Routing
Engine becomes master automatically, regardless of how redundancy is configured.
Related
Documentation
Checklist for Monitoring Redundant Routing Engines on page 591•
Using the Redundant Routing Engine Configuration
Purpose For routers with redundant Routing Engines, you can configure a master and backup
Routing Engine. By default, the Routing Engine in slot RE0 is the master, and the Routing
Engine in slot RE1 is the backup. Once configured, you can specify the Routing Engine to
assume mastership automatically if it detects loss of the keepalive signal from the master.
You can configure Routing Engine redundancy in the configuration mode at the [edit
chassis redundancy] hierarchy level.
NOTE: We recommend that both Routing Engines have the same
configuration. When changing the configuration on a Routing Engine, commit
it to both Routing Engines using the commit synchronize statement at the
[edit] hierarchy level.
You can configure redundant Routing Engine automatic failover for the backup Routing
Engine with a specified failover time. By default, automatic failover is disabled. To enable
it, include the failover on-loss-of-keepalives statement at the [edit chassis redundancy]
hierarchy level. By default, failover will occur after 300 seconds (5 minutes) unless a
different time is specified. The failover time is indicated by the keepalive-timeseconds
statement at the [edit chassis redundancy] hierarchy level. The range for the keepalive
time is from 2 to 10,000 seconds.
To display the current Routing Engine redundancy configuration:
1. Enter configuration mode using the following command:
user@host# configure
2. From the [edit chassis redundancy] hierarchy level, show the configuration using the
following command:
user@host# show
Action To display the current Routing Engine configuration, you can also use the following
command:
599Copyright © 2012, Juniper Networks, Inc.
Chapter 29: Monitoring Redundant Routing Engines
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