Installation & Operation Manual 252 Document # LTRT-92224
Mediant 8000
28.5.4 Actual Redundancy Mode
The Actual Redundancy mode indicates the actual level of protection provided for the
specific Media Gateway board. The Actual Redundancy mode may provide a lower
level of redundancy to the Desired Redundancy mode, configured by the user, due to
the following factors:
• Mismatches in configuration of the normal and redundant Media Gateway
boards
For each parameter that is configured with different values on the normal
and redundant Media Gateway boards, Redundancy Type of the parameter
is used to determine whether this mismatch affects the Actual Redundancy
mode. The following parameter redundancy types are available:
♦ Hot – mismatch in this parameter between the active and redundant
Media Gateway boards has no affect on the Actual Redundancy mode;
most of the configuration parameters belong to this type;
♦ Warm – mismatches in a parameter value between the Active and the
Redundant Media Gateway boards, degrade the Actual Redundancy
mode to Warm value; when a parameter is set to the same value on the
Active and Redundant Media Gateway boards, there is no affect on the
Actual Redundancy mode; parameters of this type are marked with
icon in EMS configuration screens.
• Mismatches in Hardware and Application Types of normal and redundant
Media Gateway boards
Mismatch in the Hardware and/or Application Types of normal and
redundant Media Gateway boards may degrade Actual Redundancy Mode to
Warm or No Redundancy value.
• Current state of the normal and redundant Media Gateway boards
Actual Redundancy mode will be downgraded to No Redundancy value
when normal or redundant Media Gateway boards are out of service
• Current state of the Redundancy group
Actual Redundancy mode will be downgraded to No Redundancy value
when another Media Gateway board is currently "backed up" by the
Redundant board
• Mismatches in License Keys of Normal and Redundant Media Gateway
boards
Actual Redundancy mode will be downgraded to No Redundancy value
when critical mismatches are detected in the License Keys of normal and
redundant Media Gateway boards.
The Actual Redundancy mode is independently determined for each Media Gateway
board . At any point in time, in the same Redundancy group, the Actual Redundancy
mode of one board may differ from the Actual Redundancy mode of another board
(due to the difference in their state or configuration).
In the Boards Redundancy Status screen, the HA Reason column indicates the exact
reason for the current value of the Actual Redundancy mode. For example, if a
specific configuration parameter differs between the specific Media Gateway board
and the Redundant board, its name will be specified in the HA Reason column.
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