Configuration Rollback
52 Basic System Configuration Guide
The operator should define a basic rescue configuration that is known to work and give
correct management access to the node.
The location and filename of the rescue file are configurable. SR OS appends an “.rc” suffix
to the specified rescue filename.
Operational Guidelines
The following points offer some operational guidance on the usage of rollback.
• Both admin save and rollback save should be performed periodically:
•Use admin save to backup a complete configuration file that can be used during
router reboot.
→ Used with a reboot as a last resort.
→ Do an admin save after any major h/w changes or major service changes.
→ Should be performed after any software upgrade.
•Use rollback-save to create a rollback checkpoint.
→ Used for intermediate checkpoints that can be recovered with minimal impacts
to services.
→ Should be performed each time that a moderate amount configuration changes
have been made.
→ Should be performed after any h/w changes.
→ Should be performed after any s/w upgrade.
→ Could also be scheduled with cron (for example, once every 1 or 2 weeks).
•A new rescue-save must be created when hardware is changed.
• Rollback-checkpoint files are not editable nor compatible/interchangeable with
config files (generated with admin save).
• Do not continue to repeat the rollback save, rollback save, rollback save over the
course of weeks/months without also doing executing an occasional admin save. In
a serious situation, use one of the saved configs to use as the primary config for an
admin reboot.
• Software Upgrade: It is recommended to create a Rollback Checkpoint (admin
rollback save), in addition to saving the configuration (admin save), after an
upgrade has been performed and the system is operating as expected. This will ensure
a good checkpoint fully compatible with the new release is available at a point shortly
after the upgrade.
• An operator could create a set of rollback checkpoints to support busy/quiet days or
weekend/weekday and use cron to shift between them.
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