The 7705 SAR uses a 1:1 redundancy scheme. Redundancy methods facilitate system synchronization between the active and standby CSMs so that they maintain identical operational parameters to prevent inconsistencies in the event of a CSM failure.
When automatic system synchronization is enabled for an entity, any save or delete file operations configured on the primary, secondary, or tertiary choices on the active CSM file system are mirrored in the standby CSM file system.
Although software configurations and images can be copied or downloaded from remote locations, synchronization can only occur locally between compact flash drives (cf3-A: and cf3-B:).
Synchronization can occur:
automatically — automatic synchronization is disabled by default. To enable automatic synchronization, the config>redundancy>synchronize command must be specified with either the boot-env parameter or the config parameter.
When the boot-env parameter is specified, the BOF, boot.ldr, config, and image files are automatically synchronized. When the config parameter is specified, only the config files are automatically synchronized.
Automatic synchronization also occurs whenever the BOF is modified with persistence on and when an admin>save command is entered with no filename specified.
manually — to execute synchronization manually, the admin>redundancy> synchronize command must be entered with the boot-env parameter or the config parameter.
When the boot-env parameter is specified, the BOF, boot.ldr, config, and image files are synchronized. When the config parameter is specified, only the config files are synchronized.
The following shows the output displayed during a manual synchronization of configuration files.
ALU-1>admin>redundancy# synchronize config
Syncing configuration......
Syncing configuration.....Completed.
ALU-1#