Synchronization and Redundancy
246 Basic System Configuration Guide
Synchronization and Redundancy
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, 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 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, 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.
A:ALA-12>admin>redundancy# synchronize config
Syncing configuration......
Syncing configuration.....Completed.
A:ALA-12#
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