Chapter 36: Host Redundancy Overview
M40e and M160 Router Redundant Host Modules
On M40e and M160 routers, the host module consists of a paired Routing Engine and MCS. One pair functions as master, while the other stands by as a backup should the master Routing Engine fail. (See Figure 185 and “Redundancy
Connection for an M40e or M160 Router” on page 472.)
Figure 185: M40e and M160 Router Redundant Host Modules
M40e router rear M160 router rear
MCS0
RE0
RE1
MCS1
SFM 0
SFM 1
MCS 0
RE 0
RE 1
MCS 1
Do not install an SFM in this slot
Do not ins tall an SFM in this s lot
Miscellaneous
Control Subsystem
PCG 0
PCG 1
Routing
Engines
Miscellaneous
Control Subsystem
SFM 0
SFM 1
MSC 0
RE 0
RE 1
MSC 1
SFM 2
SFM 3
PCG 0
PCG 1
MCS0
RE0
RE1
MCS1
Understanding Redundancy for the Routing Engine, Host Module, and Host Subsystem !
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