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    T320 Router, T640 Router, and T1600 Router Routing Engine Redundancy

    Figure 1 shows the T320 router, T640, and T1600 redundant Routing Engines that are components of the host subsystem.

    Figure 1: T320, T640, and T1600 Router Routing Engines

    T320, T640, and T1600 Router
Routing Engines

    Both the Routing Engine and the Control Board must be installed for the host subsystem to function. When two host subsystems are installed in the router, both are powered on, but only one is the master; the second host subsystem is the backup and performs no functions. By default, the master host subsystem has components installed in slots RE0 and CB0; the backup host module has components installed in slots RE1 and CB1. If one Routing Engine physically fails, the other one assumes the routing functions. If a software failure occurs, the other backup Routing Engine assumes routing functions if some preliminary configuration has been done.

    The T320 router, T640 router, and T1600 router craft interface LEDs indicate the Routing Engine operating status and mastership.

    Published: 2012-08-20