Routing Engine, Host Module, and Host Subsystem Redundancy Connections ! 471
Chapter 36: Host Redundancy Overview
Redundancy Connection for an M20 Router
Figure 188 shows the connection between the master and backup Routing Engines
on an M20 router. Keepalive messages are sent between the master and backup
Routing Engine through the switch on the SSB. In this way, the master and the
backup Routing Engines exchange state information.
Figure 188: Redundancy Connection for an M20 Router
Master Routing Engine
RE0
SSB
RE1
Backup Routing Engine
FXP1FXP1
Switch
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