Summary:If the automatic and periodic database backup functions of an MSTP NE are disabled,
NE configurations may be lost after the system control board is warm or cold reset, active and
standby system control boards switch over, or the NE is restarted.
[Problem Description]
Trigger conditions:
This problem occurs if the following conditions are met:
Automatic and periodic database backup functions of the NE are disabled.
After automatic and periodic database backup functions of the NE are disabled, modifications
such as service configuration or ASON rerouting are made to the NE.
The system control board is warm or cold reset, active and standby system control boards switch
over, or the NE is restarted.
Fault symptoms:
After the system control board is warm or cold rest or active and standby system control boards
switch over, some configurations modified after automatic and periodic database backup functions
of the NE are disabled may be lost. In this case, a service board reset will result in complete or
incomplete service interruption.
After the NE is restarted, some configurations modified after automatic and periodic database backup
functions of the NE are disabled may be lost, resulting in complete or incomplete service interruption.
Identification method:
This problem can be identified using the inspection tool or commands.
Problem identification using the inspection tool
For OptiX OSN 5X0 (except OptiX OSN 580) of versions earlier than V100R006C00, OptiX OSN 2000,
OptiX OSN 1500/2500/2500REG/3500/3500II/3580/7500/7500II of V100R010 and TDM versions
earlier than V100R010, OptiX OSN 9500, and OptiX OSN 9560, run the check item selected in the
following figure.
For OptiX OSN 5X0 (except OptiX OSN 580) of V100R006C00 and later versions, and
OptiX OSN 1500/2500/2500REG/3500/3500II/3580/7500/7500II of V100R009C03,
V200R011, and packet versions later than V200R011, run the check item selected in the following figure.
For OptiX OSN 580, run the check item selected in the following figure.
For OptiX Metro 1000 V300, run the check item selected in the following figure.
For OptiX Metro 3000, run the check item selected in the following figure.
If the check results meet the analysis result shown in the following figure, the automatic
and periodic database backup functions are disabled.
Problem identification using commands
olt_4
Whether automatic and periodic database backup functions are enabled cannot be queried
using the NMS.
Periodic database backup
Run the :dbms-get-cyclebackup command. If the returned result is disable, periodic
database backup is disabled.
The following figure shows an example.
Automatic database backup
Run the :dbms-get-autobackup command. If the returned result is disable, automatic
database backup is disabled.
The following figure shows an example.
[Root Cause]
After automatic and periodic database backup functions of the NE are disabled,
new configurations or configuration modifications cannot be saved to the database.
Therefore, after the system control board is warm or cold reset, active
and standby system control boards switch over, or the NE is restarted, the new
configurations or configuration modifications fail to be restored from the database,
resulting in partial or complete configuration loss.
[Impact and Risk]
Scope: in and outside China
Risk: New configurations and configuration modifications may be lost after the
system control board is warm or cold reset, active and standby system control
boards switch over, or the NE is restarted.
[Upgrade Scenario]
System control board reset and active/standby switching are required during
an NE upgrade. If automatic and periodic database backup functions are disabled before the
NE upgrade, NE configurations may be lost after the NE upgrade.
According to the OptiX NG-SDH Upgrade Guide_Simulation Package Loading Method,
checking the consistency of databases and checking the periodic backup and automatic
backup statuses must be performed before the NE upgrade. In addition,
NE upgrade must be performed by following instructions in the corresponding upgrade guide;
otherwise, exceptions may occur during the NE upgrade.
Note：Currently, the OptiX database check tool can automatically check whether backed
up databases are normal.
However, it cannot identify whether the backed up database is the latest one. Therefore,
before upgrading an NE, use the inspection tool to check whether the automatic and
periodic database backup function is enabled.
If the function is disabled, please enable it.
[Measures and Solutions]
Recovery measures:
If automatic and periodic database backup functions are detected to be disabled
while services are not affected,
run the following commands to enable the functions:
Automatic database backup:
:dbms-set-autobackup:enable
Periodic database backup:
:dbms-set-cyclebackup:enable;
Then, run the :dbms-copy-all:drdb,fdb command to manually save new configurations
and configuration modifications to the database.
If automatic and periodic database backup functions are detected to be disabled and
services are interrupted,
perform the following operations to restore the services:
Run the following commands to enable the automatic and periodic database backup
functions.
Automatic database backup:
:dbms-set-autobackup:enable
Periodic database backup:
:dbms-set-cyclebackup:enable;
Restore configurations.
Use the NMS to re-deliver configurations to the NE according to the corresponding
product guide.
After services are interrupted, do not upload configurations to the NMS. Otherwise,
configurations on
the NMS and NE will be inconsistent.
Run the :dbms-copy-all:drdb,fdb command to manually save configurations to the
database.
—-End
Workarounds:
Exercise caution when using the commands to disable automatic and periodic
database functions.
In some maintenance scenarios, the two functions need to be disabled. Promptly
enable the two
functions once the maintenance is finished.
Solutions:
Same as the recovery measures
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