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    Understanding Redundancy for the Routing Engine, Host Module, and Host Subsystem

    To learn how redundant Routing Engines, host modules, and host subsystems work on various routing platforms. You monitor these components to provide a standby Routing Engine and controller component that will switch from standby to active, assuming mastership when a failure brings down the active master Routing Engine.

    Redundant Routing Engines are two Routing Engines that are installed in the same routing platform. One functions as the master, while the other stands by as a backup should the master Routing Engine fail.

    Redundant host modules are two Routing Engine and Miscellaneous Control Subsystem (MCS) pairs installed in the same routing platform. One pair functions as master, while the other stands by as a backup should the master Routing Engine fail.

    Redundant host subsystems are two Routing Engine and Control Board pairs installed in the same routing platform. One pair functions as master, while the other stands by as backup should the master Routing Engine fail.

    The M5, M10, M7i, and M40 routers do not support Routing Engine, host module, or host subsystem redundancy.

    Published: 2012-08-20