SR-series routers supporting redundancy use a 1:1 redundancy scheme. Redundancy methods facilitate system synchronization between the active and standby Control Processor Modules (CPMs) so they maintain identical operational parameters to prevent inconsistencies in the event of a CPM 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 CPM file system are mirrored in the standby CPM file system.
Although software configurations and images can be copied or downloaded from remote locations, synchronization can only occur locally between compact flash drives (cf1:, cf2:, and cf3:).
Synchronization can occur either:
automatically
Automatic synchronization is disabled by default. To enable automatic synchronization, the config>redundancy>synchronization 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, YANG schema files and image files are automatically synchronized. If the schema YANG files are not found, the files are not copied but the rest of the synchronization is not affected.
When the config parameter is specified, only the config files are automatically synchronized.
Automatic synchronization also occurs whenever the BOF is modified and when an admin>save command is entered with no filename specified.
manually
To execute synchronization manually, the admin>redundancy> synchronization 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, YANG schema files and image files are synchronized.If the schema YANG files are not found, the files are not copied, but the rest of the synchronization is not affected.
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.
A:ALA-12>admin>redundancy# synchronize config
Syncing configuration......
Syncing configuration.....Completed.
A:ALA-12#