Alcatel 7750 SR-12, Installation Manual

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Chassis Features
Page 24
7750 SR-12
S
YNCHRONIZATION IN
R
EDUNDANT
S
YSTEMS
The 7750 SR-12 router is capable of a 1:1 Control Processor Module (CPM) redundancy scheme.
Redundancy methods facilitate system synchronization between the active and standby 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 operation
configured on the primary, secondary or tertiary locations 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>system>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>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.
For more information about redundancy and synchronization, refer to the Alcatel OS
System Guide
S
YNCHRONIZING
R
EDUNDANT
B
ITS
T
IMING
P
ORTS
In 7750 SR-12 systems with redundant SF/CPMs, a Y-cable can be connected to the Building
Integrated Timing Supply (BITS) port on each CPM front panel.