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Rollback is graceful at any stage. Only those Media Gateway boards that were
upgraded to the new software version are reset. The reset is done gracefully – similar
to the way upgrade is performed. The Ethernet Switch boards are downgraded to the
previous version automatically one by one – without any effect on service.
15.5
Software Upgrade/Rollback Troubleshooting
If you experience an unexpected network or software problem during online software
upgrade (e.g., if the PC on which the EMS client runs, crashes, or the network
connection to the media gateway is lost) and because of the failure you can neither
complete nor cancel the online software upgrade, you must perform a manual rollback
to the previous software configuration.
15.5.1
Performing a Manual Rollback to the Previous Software
Configuration
To perform a manual rollback to the previous software
configuration, take these 13 steps:
1.
Close the EMS Upgrade Wizard screen.
2.
Connect to both of the SC boards through Telnet or the RS-232 port.
3.
On each of the SC boards, (if the OS is currently running, i.e., Telnet works
and/or a login prompt appears), log in and stop the SC software on both SC
boards by typing tools tg dn. Press Enter.
client208::~# tools tg dn
4.
If there is no Telnet connection an SC board, take these 2 steps:
•
Connect to the RS232 console of the SC board and verify that the OS is actually
not running on it.
•
If the OS is running, stop the SC software as described above.
5.
If hardware failure occurs on one of the SC boards and it does not respond to the
RS232 console at the OBP level, remove the failed SC board from the chassis.
For details on replacing a failed SC board, refer to 'SC Board Replacement
Procedure' on page 133.
Note:
6.
Rollback the Primary SC board (if it has not been removed), to remove the
"upgrade in progress" marker, type rm –f /Upgrade/UpgradeInProgress.ini and
press Enter.
client208::~# rm –f /Upgrade/UpgradeInProgress.ini
It is important to stop SC software on both of the SC boards prior to
proceeding to the next step.
15. Software Upgrade
Issue 1 October 2007 167
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Troubleshooting
