Figure 289: Redundancy Connection For An M40E Or M160 Router; Figure 290: Redundancy Connection For An M120 Router - Juniper M Series Monitoring And Troubleshooting Manual

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Redundancy Connection for an M120 Router

Figure 289: Redundancy Connection for an M40e or M160 Router

M40e and M160 Router Redundant Host Modules on page 567

Figure 290 on page 573

shows the connection between the master and backup host

subsystems on an M120 router. Keepalive messages are sent from the Routing Engine

to the em0 and also to the other host subsystem via the switch. A keepalive response is

sent back over the switch to the other Routing Engine. In this way, the master and the

backup host subsystems exchange state information.

Master Host Subsystem

Physical connection

Chapter 28: Host Redundancy Overview

Backup Host Subsystem