Internet Router Hardware Guide

M160 Internet Router Hardware Guide
Host Module LEDs ............................................................. 31
FPC LEDs and Offline Button ................................................. 31
Connector Interface Panel (CIP) ................................................... 32
Routing Engine Management Ports........................................... 33
BITS Input Ports................................................................ 34
Alarm Relay Contacts.......................................................... 34
Power System ....................................................................... 35
Power Supply................................................................... 36
Circuit Breaker Box ............................................................ 38
Fuses............................................................................ 39
Cooling System ..................................................................... 39
Cooling System Components ................................................. 40
Airflow through the Chassis................................................... 40
Cable Management System........................................................ 41
Chapter 3
JUNOS Internet Software Overview .. 43
Routing Engine Software Components............................................ 43
Routing Protocol Process...................................................... 44
IPv4 Routing Protocols.................................................... 44
IPv6 Routing Protocols.................................................... 46
Routing and Forwarding Tables .......................................... 47
Routing Policy ............................................................. 47
VPNs ............................................................................ 48
Interface Process............................................................... 49
Chassis Process ................................................................ 49
SNMP and MIB II Processes ................................................... 49
Management Process.......................................................... 49
Routing Engine Kernel......................................................... 49
Tools for Accessing and Configuring the Software ............................... 50
Tools for Monitoring the Software................................................. 50
Software Upgrades.................................................................. 50
Chapter 4
System Architecture Overview .. 51
Packet Forwarding Engine Architecture........................................... 51
Data Flow through the Packet Forwarding Engine .......................... 52
Routing Engine Architecture ....................................................... 53
Routing Engine Functions.....................................................54
Part 2
Initial Installation
Chapter 5 Preparing for Router Installation .. 59
Rack Requirements................................................................. 59
Rack Size and Strength ........................................................60
Spacing of Mounting Holes.................................................... 61
Connection to Building Structure............................................. 62
Clearance Requirements for Airflow and Hardware Maintenance..............62
Routing Node Environmental Specifications .....................................62
Fire Safety Requirements .......................................................... 63
vi Table of Contents