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user@host> show chassis redundancy

routing-engine 0 master;

routing-engine 1 backup;

failover on-loss-of-keepalives;

keepalive-time 300;

Documentation

Checklist for Monitoring Redundant Routing Engines on page 591•

Check the Default Routing Engine Redundancy Behavior

Purpose By default, the Junos OS uses RE0 as the master Routing Engine and RE1 as the backup

Routing Engine. Unless otherwise specified in the configuration, RE0 will always assume

mastership if the acting master Routing Engine is rebooted.

To see how the default Routing Engine redundancy setting works:

CAUTION: Do not try this procedure on a production network.

Action Make sure the router is running on RE0 as the master Routing Engine.1.

2. To manually switch the state of the Routing Engine mastership, use the request chassis

routing-engine master command. RE0 is now the backup Routing Engine and RE1 is

the master Routing Engine. If you use this command to change the master Routing

Engine, and then restart the chassis software for any reason, the master reverts to

the default setting. For information about switching Routing Engine mastership, see

the request chassis routing-engine master command in the Junos OS Protocols, Class

of Service, and System Basics Command Reference.

NOTE: On the next reboot of the master Routing Engine, the Junos OS

returns the router to the default state because you have not configured

the Routing Engines to maintain this state after a reboot.

3. Reboot the master Routing Engine RE1. When you do this, the Routing Engine boots

up and reads the configuration. If you have not specified in the configuration which

Routing Engine is the master, RE1 uses the default configuration as the backup. Now

both RE0 and RE1 are in a backup state. The Junos OS detects this conflict and, to

prevent a no-master state, reverts to the default configuration with RE0 assuming

mastership.

Documentation

Checklist for Monitoring Redundant Routing Engines on page 591•

Display the Redundant Routing Engines Installed in the Router

Purpose To check for redundant Routing Engines in the router.

M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series User Manual

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