Understanding Redundant Control Boards ! 561
Chapter 42: Monitoring Redundant Control Boards
Understanding Redundant Control Boards
Purpose Inspect redundant Control Boards to ensure that router component functions are
uninterrupted. Each Control Board works with an adjacent Routing Engine to
provide 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.
What Are Redundant
Control Boards
Redundant Control Boards are two Control Boards installed in the M320 router,
T320 router, or the T640 routing node.
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 227 on page 562). The Control Boards are hot-pluggable.
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