Understanding The Routing Engine - Juniper M Series Monitoring And Troubleshooting Manual

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Table of Contents

M Series and T Series Routers Monitoring and Troubleshooting Guide

Documentation

Understanding the Routing Engine

Routing Engine Overview

Documentation

Routing Engine Overview on page 168

Routing Engine Types and Characteristics on page 169

Routing Engine Overview on page 168

Routing Engine Types and Characteristics on page 169

Routing Engine Locations on page 172

Routing Engine Redundancy on page 176

Routing Engine Component Companionship on page 177

Routing Engine Boot Devices on page 177

Routing Engine Storage Media on page 178

Inspect the Routing Engine to ensure that key system processes are operating normally.

The Routing Engine is a key component in the router. It is primarily responsible for the

protocol intelligence of the router. Thus, it is responsible for creating a routing table,

which consists of all routes learned by all protocols running on the router. The Routing

Engine interprets the routing table, generates a subset of routes to be used for all

forwarding purposes, and places them in the forwarding table. The Routing Engine also

holds the microcode for the Packet Forwarding Engine.

The Routing Engine is responsible for user interaction functions, such as the command-line

interface (CLI), Simple Network Management Protocol (SNMP) management, and craft

interface interaction.

The Routing Engine consists of the following components:

Intel Pentium compact Peripheral Component Interconnect (PCI) platform

Nonrotating CompactFlash card (RAM disk)

Standard rotating hard drive

Removable media drive

The Junos OS resides on the CompactFlash card, with an alternate copy residing on the

system hard drive.

Routing Engine Types and Characteristics on page 169

Routing Engine Redundancy on page 176