Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
496 ! Understanding Redundant Routing Engines
M40e and M160 Router Routing Engine Redundancy
The M40e and M160 routers have redundant Routing Engines that are components
of the host module (see Figure 195). The host module consists of a Routing 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 “Monitoring Redundant MCSs” on page 567.
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 143.)
Figure 195: M40e and M160 Router Redundant Routing Engines
1689
PCG 0
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
SFM 2
SFM 3
PCG 1
Routing
Engines
M160 router rear M40e router rear
PCG 0
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
PCG 1
Routing
Engines
Do not install an SFM in this slot
Do not install an SFM in this slot

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

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