Rolling Back JUNOS Configuration Changes

This topic shows how to use the rollback command to return to the most recently committed JUNOS configuration. The rollback command is useful if you make configuration changes and then decide not to keep the changes.

The following procedure shows how to configure an SNMP health monitor on a device running JUNOS software and then return to the most recently committed configuration that does not include the health monitor. When configured, the SNMP health monitor provides network management system (NMS) with predefined monitoring for file system usage, CPU usage, and memory usage on the device.

1. Enter configuration mode:

   user@host> configure

   entering configuration mode

   [edit]

   user@host#

2. Show the current configuration (if any) for SNMP:

   [edit]

   user@host# show snmp

   No snmp statements appear. SNMP has not been configured on the router.

3. Configure the health monitor:

   [edit]

   user@host# set snmp health-monitor

4. Show the new configuration:

   [edit]

   user@host# show snmp

   health-monitor;

   The health-monitor statement indicates that SNMP health monitoring is configured on the router.

5. Use the rollback configuration mode command to return to the most recently committed configuration:

   [edit]

   user@host# rollback

   load complete

6. Show the configuration again to make sure your change is no longer present:

   [edit]

   user@host# show snmp

   No snmp configuration statements appear. The health monitor is no longer configured.

7. Use the commit command to activate the configuration to which you rolled back:

   [edit]

   user@host# commit

8. Exit configuration mode:

   [edit]

   user@host# exit

   Exiting configuration mode

You can also use the rollback command to return to earlier configurations. For more information, see Managing Configurations.