Troubleshooting guide

9 — NE maintenance
Alcatel-Lucent 5620 Service Aware Manager 9-5
5620 SAM
System Administrator Guide
Managing NE configuration rollbacks
A configuration rollback allows you to undo configuration changes but minimize the
impact to services by avoiding a system reboot. The 5620 SAM allows you to
perform up to five simultaneous NE rollback revert and rescue operations.
The rollback function allows you to use a configuration temporarily and revert to a
previous configuration, for example to:
• troubleshoot network problems on an NE
• configure trial sites
• set configurations for specific days such as weekdays or weekend days
For each NE, you create a rescue file which is a device configuration snapshot that
an NE retains until the creation of a new rescue file, which overwrites the existing
file. In addition, you can create multiple checkpoint files for each NE at any time.
Checkpoint files provide a history of NE configuration changes and include the full
configuration at the moment they are created. Only when a compare or revert
operation is done, is the delta between both created, and it is the delta that is applied
to the network. Checkpoint files are retained until a configurable maximum number
of files is reached, after which the oldest checkpoint files are purged. You can create
checkpoint files manually, or you can automate the creation of the file using NE
rollback policies.
The rescue file and checkpoint files are saved locally or remotely to an FTP site or
to a flash drive. You can change the NE configuration using either file at any time
without having to reboot.
The 5620 SAM scheduling function supports NE configuration rollback, which
allows you to automate NE configuration checkpoint file creation and NE
configuration reversion. See the 5620 SAM User Guide for scheduling information.
Comparing configuration files
A compare function allows you to display NE configuration changes between
selected checkpoints, a selected checkpoint and the active configuration, a selected
checkpoint and the rescue file, or the active configuration and the rescue file. This is
useful for troubleshooting NE configurations.
Note 1 — In the configuration rollback process, the 5620 SAM sends
snmp-set commands to initiate the creation of the rescue file and
checkpoint files. The rest of the configuration rollback activity is then
performed by the NE.
Note 2 — The configuration rollback function is supported on the
7450 ESS, 7750 SR, and 7950 XRS.
Note — In order to use the compare function, valid SSH or Telnet
credentials must be specified in the applicable mediation policy.
Release 13.0 R2 | May 2015 | 3HE 09815 AAAB TQZZA Edition 01