Synchronization and Redundancy
Page 220 7750 SR OS Basic System Configuration Guide
Synchronization and Redundancy
7750 SR-Series routers supporting redundancy (such as the SR-12 and SR-c12 models) 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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