Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
294 ! Understanding the Host Subsystem
Host Subsystem Location
Figure 121 shows the location of the host subsystem components on the M320 and
T320 routers and the T640 routing node.
Figure 121: M320 and T320 Router and T640 Routing Node Host Subsystem Location
You can install one or two host subsystems into the midplane from the rear of the
chassis. Each host subsystem functions as a unit: the Routing Engine requires the
corresponding Control Board to operate, and vice-versa. If the adjacent component
is not present, the Routing Engine or Control Board will not function.
RE0 installs
below
CB0, and RE1 installs above CB1 otherwise the circuit will not be connected.
You take the host subsystem offline and online as a unit. Before you replace a
Routing Engine or a Control Board, you must take the host subsystem offline. The
host subsystem is hot-pluggable.
See Also ! Monitoring the Routing Engine on page 125
! Monitoring the Control Board on page 301
! Host Redundancy Overview on page 463
! Monitoring Redundant Routing Engines on page 491
! Monitoring Redundant Control Boards on page 559
g003265
T320 rear T640 rear
Control Boards
Routing
Engines
Control Boards
CB0
CB1
RE1
RE0
CB0
CB1
RE1
RE0
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
RE1
RE0
Control Boards
Routing Engines

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English