M40E Routing Engine Description; Figure 14: M40E And M160 Router Redundant Host Modules - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide

Figure 14: M40e and M160 Router Redundant Host Modules

M40e router rear
S F M 0
OFF LINE
FAIL
OK
S F M 1
OFF LINE
FAIL
OK
M C S 0
OFF LINE
FAIL
OK
MAS TER
MCS0
R E 0
RE0 R E 1
M C S 1
RE1
OFF LIN
E
FAIL
OK
MAS TER
MCS1
Related
Documentation

M40e Routing Engine Description

26
Miscellaneous
Control Subsystem
P C G 0
Routing
P C G 1
Engines
Miscellaneous
Control Subsystem
M40e System Architecture Overview on page 59
Host Module LEDs on the M40e Craft Interface on page 37
The Routing Engine runs the Junos OS. The software processes that run on the Routing
Engine maintain the routing tables, manage the routing protocols used on the router,
control the router's interfaces, control some chassis components, and provide the interface
for system management and user access to the router.
For a description of the Routing Engine's role in router architecture, see "M40e Routing
Engine Architecture" on page 61.
One or two host modules (paired Routing Engine and MCS) can be installed into the
midplane from the rear of the chassis, as shown in "M40e Chassis Description" on page 8.
If two host modules are installed, the Routing Engines together determine which is the
master and which is in standby mode (and so performs no functions). By default, the
Routing Engine in the slot labeled
determines which of the two PCGs is the master.
NOTE: If two Routing Engines are installed, they must both be the same
hardware model.
The Routing Engine is hot-pluggable, as described in "M40e Field-Replaceable Units
(FRUs)" on page 157. For information about the effect of removing a Routing Engine, see
M160 router rear
S F M 0
OFF LINE
FAIL
OK
S F M 1
OFF LINE
FAIL
OK
M S C 0
OFF LINE
FAIL
OK MAS TER
R E 0
R E 1
M S C 1
OFF LIN
E
FAIL
OK
MAS TER
S F M 2
S F M 3
RE0 is the master. The master Routing Engine also
Copyright © 2010, Juniper Networks, Inc.
MCS0
P C G 0
RE0
P C G 1
RE1
MCS1