Feature Behavior - Alcatel-Lucent 7950 XRS Series Configuration Manual

Feature Behavior

The following list describes detailed behavior and CLI usage of the rollback feature:
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7950 SR OS Basic System Configuration Guide
The user can create a rollback checkpoint, and later, revert to this checkpoint with minimal
impacts to services:
admin>rollback# save [comment <comment-string>]
comment-string: an 255 char comment associated with the checkpoint
Rollback checkpoints include all current operationally active configuration:

Changes from direct CLI commands in the configuration branch.

SNMP sets
Rollback checkpoints do not include bof configurations. The BOF file (and bof config) is
not part of a rollback-save or rollback. A rollback does not change any of the bof
configuration. The BOF contains basic information for the node and does not change
frequently (mostly during initial commissioning of the node).
A rollback save feature can be automatically executed (scheduled, for example, monthly)
using the cron facility of SR-OS.
The latest rollback checkpoint file uses a suffix of ".rb". The next latest rollback
checkpoint file has a suffix of ".rb.1", the next oldest has a suffix of "rb.2" etc:
file-url.rb <--- latest rollback file
file-url.rb.1
...
file-url.rb.9 <--- oldest rollback file
When a rollback save [no "-"] is executed, the system shifts the file suffix of all the
previous checkpoints by 1 (new id = old id + 1). If there are already as many checkpoint
files as the maximum number supported then the last checkpoint file is deleted.
The maximum number of rollback checkpoints is configurable and defaults to 10 ("latest"
and 1 through 9, where checkpoint file 9 is deleted during the next rollback-save).
The location and name of the rollback checkpoint files is configurable to be local (on
compact flash) or remote. The file-url must not contain a suffix (just a path/directory +
filename). The suffix for rollback checkpoint files is ".rb" and is automatically appended
to rollback checkpoint files.
config>system>rollback# rollback-location <file-url>
There is no default rollback-location. If one is not specified (or it is cleared using "no
rollback-location") and a rollback save is attempted, the rollback save will fail and return
an error message.
The entire set of rollback checkpoint files can be copied from the active CPM CF to the
inactive CPM CF. This synchronization is done via the following command:
admin>redundancy# rollback-sync
The operator can enable automatic synchronization of rollback checkpoint files between
the active CPM and inactive CPM. When this automatic synchronization is enabled, a
rollback save will cause the new checkpoint file to be saved to both the active and standby.
The suffixes of the old checkpoint files on both active and standby CPMs are incremented.
CLI Usage
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