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

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Article ID: KB15580 KB Last Updated: 10 Jun 2020Version: 9.0
Summary:

This article recommends a procedure for backing up a router in an SRX chassis cluster by using the backup-router configuration command.

 

Symptoms:

Setting a destination of 0.0.0.0/0 on a backup router configuration is not supported and can cause intermittent connectivity issues to Juniper and other third party management tools from the standby node when outbound-ssh is in use.

The following is an example of incorrect configuration:

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

 

Solution:

The recommended way to set up a backup router by using a non-zero prefix is described in Configuring a Backup Router.

The following is an example of the 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 be used only by the RG0 secondary node; the primary node will continue to use the inet.0 route table.

 

Modification History:

2020-06-10 Article reviewed for accuracy; no changes required

 

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