Understanding the Redundant Routing Engine Configuration
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 is in the JUNOS software command-line interface (CLI) configuration mode at the [edit chassis redundancy] hierarchy level.
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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 |
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, follow these steps:
- Enter the CLI configuration mode using the following command:
- From the
[edit chassis redundancy]hierarchy level, show the configuration using the following command:
user@host# configure
user@host# show
Alternative Action
To display the current Routing Engine configuration, you can also use the following CLI command:
user@host> show chassis redundancy
Sample Output
user@host> show chassis redundancy
routing-engine 0 master;
routing-engine 1 backup;
failover on-loss-of-keepalives;
keepalive-time 300;