Installation & Operation Manual 822 Document # LTRT-92224
Mediant 8000
When the Hitless Upgrade mechanism is selected, it is still possible that the Graceful
Shutdown mechanism will be used for certain Media Gateway boards. For more
information, see Section 'Overview' on page 811.
VoP Board Upgrade Mode – level of user interaction while upgrading Media
Gateway boards; the following options are available:
• Non-Interactive - the upgrade process moves to the next Media Gateway
board without any user interaction; user is informed when all Media Gateway
boards complete the upgrade.
• Pause after the first Media Gateway board – the upgrade pauses after the
first Media Gateway board is upgraded; the user may test the system to
ensure that the first Media Gateway board's upgrade was successful before
upgrading the remaining Media Gateway boards.
• Pause after each Media Gateway board—the upgrade pauses after each
Media Gateway board is upgraded.; the user controls the start time for each
of the Media Gateway board upgrades and thus may further minimize the
amount of calls affected by the upgrade process.
Graceful Shutdown Period (sec) - the amount of time allowed for calls to end
before upgrading each Media Gateway board via the Graceful Shutdown
mechanism. This parameter has no affect when the Media Gateway board is
upgraded via the Hitless Upgrade mechanism. During the Graceful Shutdown
Period (if it is used), the Media Gateway board accepts no new calls, and at the
end of this period all remaining calls are dropped.
Graceful Shutdown Period for Abort (sec) – graceful shutdown period that is
used during rollback sequence when user presses the Abort button.
Notes:
• Set Graceful Shutdown Period parameter to the smallest applicable time, since
it directly affects the total time of the upgrade process and new calls are not
established on the specific Media Gateway board during this time.
• Even when you choose Hitless Upgrade as a preferred upgrade mechanism,
some Media Gateway boards may be upgraded via Graceful Shutdown
mechanism (for more information, see Section 'Overview' on page 811).
Therefore, set proper value of Graceful Shutdown Period and estimate
required worst-case upgrade maintenance time.
• Rollback sequence always uses the Graceful Shutdown mechanism. Therefore
always set proper value for Graceful Shutdown Period for Abort parameter.
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