Configuration Rollback
Page 52 7210 SAS M, T, X, R6 Basic System Configuration Guide
• Although the use of the Control-C key combination is not recommended during a rollback
revert, it is supported (through CLI or SNMP). Interrupting a rollback revert may leave
the router in a state that is not necessarily something between the old active config and the
rollback checkpoint since the rollback processing may have been in the middle of tearing
things down or rebuilding configurations. A strong warning is issued in this case to
indicate that the operator must examine the config and potentially issue another rollback
revert to return to a known (and coherent) configuration.
• A High Availability CPM switchover during a rollback revert will cause the rollback
operation to abort. The newly active CPM will have an indeterminate configuration.
When an HA switchover occurs during a rollback (or within a few seconds of a rollback
completing), the operator is advised to repeat the rollback revert operation to the same
checkpoint.
Rescue Configuration
A special rescue configuration checkpoint can be created that an operator can rollback revert to at
any time. The rescue configuration has its own keyword (“rescue”) and does not use the same
rolling suffix indices as the normal rollback checkpoints. This allows the operator to easily return
to the rescue configuration state without having to consider a checkpoint index, and ensures that
the rescue checkpoint is always available (doesn’t roll off the bottom of the list of checkpoints).
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 done periodically:
• “admin save” to backup a complete config file that can be used during router reboot.
− Used with a reboot as a last resort.
− Do an admin save after any major hardware changes or major service changes.
− should be done after any s/w upgrade.
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