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 Replacing an MCS in an M40e Router and Replacing a Routing Engine in an M40e Router.)
Figure 1: M40e and M160 Router Redundant Host Modules
