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Figure 14: M40e and M160 Router Redundant Host Modules
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
MASTER
PCG 0
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
PCG 1
Routing
Engines
Miscellaneous
Control Subsystem
Miscellaneous
Control Subsystem
MCS0
RE0
RE1
MCS1
MCS0
RE0
RE1
MCS1
Do not install
an SFM
in this slot
Do not install
an SFM
in this slot
M40erouter rear
M160router rear
PCG 0
SFM 0
SFM 1
MSC 0
RE 0
RE 1
MSC 1
SFM 2
SFM 3
PCG 1
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
OFFLINE
FAIL
OK
MASTER
OFFLINE
FAIL
OK
MASTER
g002293
Related
Documentation
M40e System Architecture Overview on page 59
•
•
Host Module LEDs on the M40e Craft Interface on page 37
M40e Routing Engine Description
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
RE0
is the master. The master Routing Engine also
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
Copyright © 2010, Juniper Networks, Inc.
26
M40e Multiservice Edge Router Hardware Guide
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