Understanding the Control Board ! 305
Chapter 22: Monitoring the Control Board
M320, T320 Router, and T640 Routing Node Control Board Location
You can install one or two Control Boards in the router. The Control Boards install
into the upper rear of the chassis in the slots labeled
CBO and CB1 (see Figure 127).
Figure 127: M320 Router, T320 Router, and T640 Routing Node Control Board Location
Each Control Board requires that a Routing Engine be installed in the adjacent slot.
CB0 installs above RE0, and CB1 installs below RE1. A Control Board does not
function if no Routing Engine is present in the adjacent slot.
If two Control Boards are installed, one functions as master and the other acts as
backup. If the master Control Board fails or is removed, the backup restarts and
becomes master.
The Control Boards are hot-pluggable.
See Also ! Monitoring the Control Board on page 301
! Monitoring the Routing Engine on page 125
! Monitoring the Host Subsystem on page 289
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T320 rear T640 rear
Control Boards
CB0
CB1
CB0
CB1
M320 rear
A
M
A
S
T
E
R
F
A
I
L
O
K
A
B
B
M
A
S
T
E
R
F
A
I
L
O
K
CB-M
CB-M
C
B
0
R
E
0
R
E
1
C
B 1
CB0
CB1
Control Boards
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