Juniper M Series User Manual

Related
Documentation
M120 Router Redundant Host Subsystems on page 567•
Redundancy Connection for an M320 Router
Figure 291 on page 574 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 291: Redundancy Connection for an M320 Router
Related
Documentation
M320 Router, T320 Router, and T640 Router Redundant Host Subsystems on page 568•
Redundancy Connection for a T320 Router, T640 Router, and T1600 Router
Figure 292 on page 575 shows the connection between the master and backup host
modules on a T320 router, T640 router, or T1600 router with a Routing Engine 600
(RE-600). Keepalive messages are sent from one Routing Engine to the other over the
fxp2 interface found on the Routing Engine. The keepalive message is received by the
other host module via the fpx1 interface. A keepalive message is sent back over the fxp2
interface of the other Routing Engine. In this way, the master and the backup host
subsystems exchange state information.
Copyright © 2012, Juniper Networks, Inc.574
M Series and T Series Routers Monitoring and Troubleshooting Guide

Juniper M Series Specifications

General

Brand	Juniper
Model	M Series
Category	Network Router
Language	English