Software Rollback

The Software rollback feature is available if the user experiences a problem with a software upgrade or a corrupted system.

When executed, the system will restore the previous software and database by a single command.

Bolt Software Rollback comprises the following attributes:

Enables rapid rollback to previous releases.
The database is restored just prior to switching
The database exists with the load until that load is deleted.
Database Rollback will restore the previous load and database
Software Rollback will typically only take a few minutes, depending on the size of the network.
Since OLT and ONTs, typically, still have the previous load, all can rapidly switch back.

Video

Access OLT Command Line Interface (CLI)

Connect via Console Serial RJ45

The BOLT is equipped with a Console Serial RJ45 interface which provides direct access to the Command Line Interface (CLI) found on all Tellabs OLTs. To use this interface, attach a standard Cisco serial cable from the OLT Console port to any serial port or USB to serial cable.

Once the cable is connected, open a serial terminal program (TeraTerm, putty, HyperTerminal, etc.) Typically, a serial port for the connection is automatically created.

When connecting directly to the OLT using the serial port, the serial parameters should be configured for standard N-8-1 (115, 200 bit/s, N, 8, 1) settings as follows:

Speed: 115200
Parity: none
Data bits: 8
Stop bits: 1

Log into the OLT CLI. The default username and password for the system are: admin/tellabs

Tellabs Linux BOLT 3.1.33 MDS1-ESUA ttyS0

MDS1-ESUA login: admin <enter>
Password: tellabs <enter>
Welcome, admin!
Last login: Mon Sep 15 18:22:55 EDT 2025 from 10.99.99.110 on pts/1

admin connected from 127.0.0.1 using console on MDS1-ESUA

Rollback Procedure

There are two ways to view the current and previous software by using the List or Show command.

To use the list command, go to the MDS1-ESUA# command line, input tolt system software list, and press Enter. Output similar to the following is displayed listing the previous and running software list.

MDS1-ESUA# tolt system software list  <enter>
image-list SR33.0_620080 (remote)
image-list SR34.0_620146 (remote)
image-list SR34.0_620147 (remote)
image-list SR34.0_620148 (local, previous)
image-list SR34.0_620149 (remote)
image-list SR34.0_620150 (local, running)
image-list SR34.0_620927 (local)
image-list SR34.0_620928 (local)
image-list SR34.0_620952 (remote)
MDS1-ESUA# _

To use the show command, go to the MDS1-ESUA(config)# command line, input show tolt system software inventory and press Enter. Output similar to the following is displayed listing both the running (current) System Version and previous (backup) System Version software.

MDS1-ESUA# show olt system software inventory <enter>
           INSTALLED  BUILD                      BUILD  SYSTEM         BUILD                      BUILD  SYSTEM
CARD AID   TYPE       DATE    VERSION            ID     VERSION        DATE    VERSION            ID     VERSION
------------------------------------------------------------------------------------------------------------------------
MDS1-ESUA  xpon16p28  250923  XPON16P28_V620135         SR34.0_620150  250911  XPON16P28_V620133         SR34.0_620148

MDS1-ESUA# _

The user will use the rollback command to automatically roll back the software to the previous version.

From the MDS1-ESUA# command line, input tolt system software rollback, and press Enter. The system will locate the previous software/database (SR34.0_620148), restore the software/database to the unit, and then switch (downgrade) from the current (SR34.0_620150) to the previous (SR34.0_620148) version.

MDS1-ESUA# tolt system software roolback  <enter>

---- Software Rollback process---
---- Approximately 4 mibnutes (depending on size)----

Start kernel images and FPGA validation: DO NOT POWER DOWN THE UNIT
Kernel images and FPGA validated.
 
OLT Type                  : BOLT
Switch Type               : XPON16P28
System Version            : SR34.0_620148
Starting crond: OK

Tellabs Linux BOLT 3.1.33 MDS1-ESUA ttyS0

MDS1-ESUA login:

When finished, the system will be running on the previous software and database configuration.