This article explains why a commit synchronize command generates warning messages when executed on a router with dual routing engines that have different versions of the Junos OS.

When a commit synchronize command is executed on a backup RE that has a lower version of the Junos OS than the primary RE, the primary RE generates warning messages.

The scenario below outlines the problem.

• RE 1 is running Junos 9.3S9.

• RE 2 is running Junos 10.0S22.

• When a commit synchronize command is executed on RE 2, the message below is generated:

juniper@lab# commit synchronize
re1:
configuration check succeeds
re0:
warning: unsupported command: pull-configuration
warning: unsupported command: pull-configuration
warning: pull configuration failed, fallback to push configuration method
commit complete
re1:
commit complete


• This situation is not encountered when a commit synchronize command is executed on RE 1.

This is the expected behavior. This error occurs when the routing engines are running different versions of the Junos OS.

Note: This issue was revealed only when one RE was running Junos 9.x or older, and the other RE was running Junos 10.x.

• synchronize (commit synchronize)