Engine and a Miscellaneous Control Subsystem (MCS). You can install two host modules
in the M40e and M160 routers. For more information about monitoring redundant MCSs,
see “Checklist for Monitoring Redundant MCSs” on page 675.
Both the Routing Engine and the MCS must be installed for the host module to function.
When two host modules are installed in the router, both are powered on, but only one is
the master; the second host module is the backup and performs no functions. By default,
the master host module has components installed in slots RE0 and MCS0; the backup
host module has components installed in slots RE1 and MCS1.
The M40e and M160 router craft interface LEDs indicate the Routing Engine operating
status and mastership. (See “Check the M40e and M160 Router Routing Engine LEDs”
on page 185.)
Figure 295: M40e and M160 Router Redundant Routing Engines
PCG 0
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
SFM 2
SFM 3
PCG 1
PCG 0
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
PCG 1
Do not install an SFM in this slot
Do not install an SFM in this slot
M160 router rear
M40e router rear
Routing engines
g004147
Routing engines
Related
Documentation
Checklist for Monitoring Redundant Routing Engines on page 591•
M320 Router Routing Engine Redundancy
The M320 router has a redundant Routing Engine that is a component of the host
subsystem (see Figure 296 on page 596). The host subsystem consists of a Routing Engine
and a Control Board. Two host subsystems can be installed in the M320 router. For more
information about monitoring redundant Control Boards, see .
Both the Routing Engine and the Control Board must be installed for the host subsystem
to function. When two host subsystems are installed in the router, both are powered on,
but only one is the master; the second host subsystem is the backup and performs no
functions. By default, the master host module has components installed in slots RE0
595Copyright © 2012, Juniper Networks, Inc.
Chapter 29: Monitoring Redundant Routing Engines
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