Installation & Operation Manual 250 Document # LTRT-92224
Mediant 8000
28.5.2 Redundancy Modes
Each Media Gateway board may have different levels of protection, depending on the
configuration of the Redundancy Group that it is assigned to and the configuration of
the board itself.
The following levels of protection (also called "Redundancy Modes" or "HA Modes")
are available:
Hot Redundancy
The Media Gateway board is fully backed-up by the Redundant board. When a
Media Gateway board fails or a user-initiated switchover occurs, the service is
restored on the Redundant board without service interruption. Both channel
capacity and active calls connection is preserved.
Warm Redundancy
The Media Gateway board is only partially backed-up by the Redundant board.
When a Media Gateway board fails or a user-initiated switchover occurs, the
service is restored on the Redundant board, preserving the channels capacity;
however, active calls are dropped. Service may be interrupted for a few minutes
after the switchover.
No Redundancy
The Media Gateway board is not protected by the Redundant board. When a
Media Gateway board fails, the service is completely dropped. This mode may
occur, for example, in case of a double failure – i.e. when two Media Gateway
boards fail consequently, the Redundant board is used to protect the first failed
board, and no protection is provided for the second failed board.
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