Alcatel-Lucent 7950 XRS Series, Configuration Manual

Page: 51 / 502

CLI Usage
7950 SR OS Basic System Configuration Guide Page 51
Figure 4: Configuration Rollback
• A rollback revert does not affect the currently stored rollback checkpoint files (no
deletions or renumbering). This means that if an operator issues a “rollback revert 3” and
then issues a “rollback-save”, the resulting rollback checkpoint files “file-url.rb” and “file-
url.rb.4” will contain the same rollback state/configuration.
• The boot-good-exec or bad-exec are not automatically executed after a rollback.
• impacts to the running services are minimized during a rollback:

no impact in areas of configuration that did not change

configuration parameters that changed (or items that changed config have
dependencies on) are first removed (revert to default) and the previous values are then
restored (can be briefly service impacting in changed areas). Some examples are the
following:

If the currently active config contains configure port 5/1/1 dwdm tdcm
dispersion -1000 and the rollback checkpoint contains configure port 5/1/1
dwdm tdcm dispersion -1010 , then the operational dispersion will transition
from -1000, to 0 and then back to -1010 for port 5/1/1 which will cause a traffic
interruption.
• A Rollback will undo any SNMP sets or direct CLI config commands that occurred since
the last checkpoint creation.
• During the period when an SR-OS node is processing a rollback revert, both CLI
commands (from other users) and SNMP commands will continue to be processed. The
time
SNMP set
CLI config
rollback save
rollback
checkpoint
rollback save
rollback
checkpoint
rollback save
rollback
checkpoint
rollback revert 2
rollback revert latest
time
SNMP set
CLI config
rollback save
rollback
checkpoint
rollback save
rollback
checkpoint
rollback save
rollback
checkpoint
rollback revert 2
rollback revert latest