control and monitoring functions for the router. These include determining Routing Engine
mastership; controlling power, reset, and SONET clocking for the other router components;
monitoring and controlling fan speed; and monitoring system status.
The Control Board is a component of the host module. Each Control Board requires a
Routing Engine to be installed in an adjacent slot. The Control Board in slot CB0 installs
above the Routing Engine in slot RE0, and the Control Board in slot CB1 installs below
the Routing Engine in slot RE1. Even if a Control Board is physically installed in the chassis,
it does not function if there is no Routing Engine present in the adjacent slot.
If two Control Boards are installed, by default, CB0 acts as the master Control Board and
CB1 acts as a backup. If the master Control Board (CB0) fails or is removed, the backup
(CB1) restarts and becomes the master Control Board.
The Control Boards install into the midplane from the back of the chassis (see Figure
334 on page 668) in M320 router , T320 router , T640 router , T1600 router, and TX Matrix
router. It is installed at the front in TX Matrix router (see Figure 335 on page 669). The
Control Boards are hot-pluggable.
667Copyright © 2012, Juniper Networks, Inc.
Chapter 34: Monitoring Redundant Control Boards
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