# Managing Module Redundancy

This chapter describes how to manage redundancy (stateless switchover) 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
- Line Module Redundancy Requirements
- Understanding Automatic Switchover
- Understanding Reversion After Switchover
- Configuring Line Module Redundancy
- Managing Line Module Redundancy
- Example: Forcing the Router to Switch from Primary Line Module to Spare Line Module
- Interoperation of Redundancy and Stateful Switchover for Line Modules
- Understanding SRP Module Redundancy
- Understanding Configuration of SRP Modules for Redundancy
- Installing a Redundant SRP Module
- Managing SRP Module Redundancy
- Switching to the Redundant SRP Module
- Determination of Redundancy Status for Line Modules and SRP Modules Using Status LEDs
- Monitoring Redundancy in Installed Hardware
- Monitoring Redundancy in Line Module and SRP Modules
- Monitoring Redundancy Status on E320 Router