CLI Usage
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Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
3.8.1.1 Rollback File Backup
The rollback checkpoint files can be backed up from the active CSM to the standby
CSM on the 7705 SAR-8 or 7705 SAR-18 with the rollback-sync command in the
admin context. Rollback file backups are not supported on fixed platforms as they
do not have redundant CSMs.
The 7705 SAR also supports automatic synchronization with the rollback-sync
command in the config context. When automatic rollback synchronization is
enabled, a rollback save will cause the new checkpoint file to be saved on both the
active and standby CSMs if the rollback location is a local location. The suffixes of all
older checkpoint files on both active and standby CSMs are incremented by one.
Automatic synchronization only causes newly created rollback checkpoint files to be
copied to both CSMs. Any rollback checkpoint files that were created before
automatic synchronization was enabled are not copied to the standby CSM, but can
be manually backed up with the rollback-sync command in the admin context.
If the config>rollback-sync command is enabled, deleting a rollback checkpoint file
also deletes the backup file and decrements the suffix ID numbers on the standby
CSM.
The dedicated rollback-sync commands are the only commands that can be used
to back up rollback checkpoint files. Existing redundancy synchronization commands
are not compatible with rollback checkpoint files.
3.8.2 Performing a CLI Configuration Reversion
The rollback revert command is used to return the CLI configuration, including all
configuration commands and SNMP sets, to the saved configuration in a rollback
checkpoint or rescue file. CLI configuration reversion can be used to quickly correct
problems in the configuration during network operation, or to aid in experimentation
by enabling a return to known settings after trying a new configuration.
The CLI configuration reversion is performed without a reboot and with minimal
impact on the services being provided by the 7705 SAR. Configuration parameters
that have changed since the checkpoint file was created, or items on which changed
configurations have dependencies, are first reset to their default values and then
restored to their previous values from the rollback checkpoint file. Performing a
configuration reversion can be briefly service-impacting in changed areas. There are
no service impacts to configuration areas that did not change since the rollback
checkpoint file was created.
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