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T4000 Host Subsystem Description

 

The host subsystem provides the routing and system management functions of the router. The host subsystem consists of a Routing Engine and an adjacent control board. To operate, each host subsystem functions as a unit; the Routing Engine requires the corresponding control board, and vice versa.

Note

You can install one or two host subsystems on the router. We recommend that you install two host subsystems for redundant protection. If you install only one host subsystem, we recommend that you install it in slots RE0 and CB0.

Each host subsystem has three LEDs, located on the upper right of the craft interface, that display its status. In addition, there are LEDs on each Routing Engine and control board.