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[SRX] 'backup-router' command configuration on Chassis Cluster

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Article ID: KB15580 KB Last Updated: 26 Nov 2014Version: 8.0
Summary:
This article recommends a procedure for backing up a router in a SRX chassis cluster using the 'backup-router' configuration command.
Symptoms:
Setting a destination of 0.0.0.0/0 on back up router configuration is not supported and can cause intermittent connectivity issues to NSM and other management hosts from secondary node.

This is an example of incorrect configuration:

set groups node0 system backup-router 10.10.10.1 destination 0.0.0.0/0
Cause:

Solution:
Recommended way to setup a backup router by using a non-zero prefix:

http://www.juniper.net/techpubs/en_US/junos/topics/task/configuration/backup-router-configuring.html

This is an example of correct non-zero subnet backup-router configuration:

set groups node0 system backup-router 10.10.10.1 destination 10.100.0.0/16

Or, as an equal alternative to the 0/0 backup-router destination, here is another usage example where 0/0 gets split into two prefixes:

set groups node0 system backup-router 10.10.10.1 destination 0.0.0.0/1
set groups node0 system backup-router 10.10.10.1 destination 128.0.0.0/1



Note: If multiple networks need to be reachable via the backup-router, you can add multiple destination entries to the configuration. Also, the backup-router configuration will only be used by RG0 secondary node, primary node will continue to use the inet.0 route table.

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