Routing Engine, Host Module, and Host Subsystem Redundancy Connections ! 473
Chapter 36: Host Redundancy Overview
Redundancy Connection for an M320 Router
Figure 190 shows the connection between the master and backup host subsystems
on an M320 router. Keepalive messages are sent from the Routing Engine over the
em0 interface. The keepalive message is forwarded to the other host subsystem via
the
bcm0 interface on the Control Board. A keepalive response is sent back over the
em0 interface to the other Routing Engine. In this way, the master and the backup
host subsystems exchange state information.
Figure 190: Redundancy Connection for an M320 Router
Master Host Subsystem
RE0
CB0 CB1
RE1
Backup Host Subsystem
EM0
PCI bridge PCI bridge
keepalive messages
physical connection
g002281
SwitchBCM0
EM0
Switch BCM0
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