Managing Module Redundancy; Line Module Redundancy Overview; Module Requirements; Erx7Xx Models And Erx14Xx Models - Juniper SERVICE AVAILABILITY - CONFIGURATION GUIDE V 11.1.X Configuration Manual

Chapter 2

Managing Module Redundancy

Line Module Redundancy Overview

Module Requirements

This chapter describes how to manage redundancy in line modules, switch route
processor (SRP) modules, switch fabric modules (SFMs), I/O modules, and I/O adapters
(IOAs) in E Series routers.
This chapter contains the following sections:
Line Module Redundancy Overview on page 7
Monitoring Line Module and SRP Module Redundancy on page 19
Managing Port Redundancy on page 23
You can install an extra line module in a group of identical line modules to provide
redundancy if one of the modules fails.
The process by which the router switches to the spare line module is called
switchover. During switchover, the line, circuit, and IP interfaces on the I/O module
or one or more IOAs appear to go down temporarily. The duration of the downtime
depends on the number of interfaces and the size of the routing table, because the
router must reload the interface configuration and the routing table from the SRP
module.
If the line module software is not compatible with the running SRP module software
release, a warning message appears on the console.
The requirements for line module redundancy depend on the type of router that you
have.
NOTE: The information in this section does not apply to the ERX310 Broadband
Services Router, which does not support line module redundancy.

ERX7xx Models and ERX14xx Models

To use this feature on ERX7xx models and ERX14xx models, you must also install
a redundancy midplane and a redundancy I/O module. For a detailed explanation
Line Module Redundancy Overview
7