Specifications

Page 2 /148
Sommaire
1. INTRODUCTION................................................................................................................................................................5
1.1 JUNIPER NETWORKS : TECHNOLOGY OVERVIEW................................................................................................5
1.1.1 Challenge: Reliability with Rapid Growth ................................................................................................5
1.1.2 Juniper Networks: Enabling IP Network Growth.........................................................................................5
1.1.3 M5, M10, M20, M40, M160 : Foundation for the Internet Core ................................................................5
The Internet Processor: Optical-Speed Packet Forwarding...........................................................................................6
1.2 JUNOS INTERNET SOFTWARE: TRAFFIC ENGINEERING AND CONTROL.........................................7
1.2.1 JUNOS Internet Software: Class-of-Service Flexibility ..............................................................................7
1.2.2 Random Early Detection for Congestion Management................................................................................7
1.3 ADDRESSING SCALABILITY CONCERNS.......................................................................................................8
1.4 THE JUNIPER NETWORKS PROPOSAL............................................................................................................8
1.4.1 Backbone Routing...........................................................................................................................................9
1.4.2 Peering..............................................................................................................................................................9
1.4.3 Traffic Management via MPLS......................................................................................................................9
1.5 ACTIVE PARTICIPATION IN STANDARDS BODIES........................................................................................9
1.6 JUNIPER NETWORKS INTERNET BACKBONE ROUTERS ADVANTAGES ............................................10
2. THE JUNIPER NETWORKS INTERNET BACKBONE ROUTER PLATFORMS .....................................12
2.1 THE M20, M40 AND M160 INTERNET CORE BACKBONE ROUTERS..............................................12
2.2 THE M20 HARDWARE SYSTEM ....................................................................................................................14
2.3 THE M40 HARDWARE SYSTEM ....................................................................................................................20
2.4 THE M160 HARDWARE SYSTEM..................................................................................................................27
2.5 M20, M40 AND M160 INTERNAL ARCHITECTURE...............................................................................36
2.5.1 Internal Architecture of the M20 and M40..................................................................................................36
2.5.2 Differences between the M20 and the M40.................................................................................................37
2.5.3 Internal Architecture of the M160................................................................................................................37
2.5.4 Switching architecture ...................................................................................................................................40
2.5.5 The Routing Engine.......................................................................................................................................41
2.5.6 The Forwarding Table...................................................................................................................................42
2.5.7 Switching Performance .................................................................................................................................42
2.5.8 The Internet Processor II ASIC...............................................................................................................43
2.6 CONGESTION CONTROL...................................................................................................................................45
2.6.1 Hardware Monitoring of Input Traffic for Congestion..............................................................................45
2.6.2 Monitoring of Output Queue Congestion and Dropping Packets..............................................................45
2.6.3 Setting congestion control variables ............................................................................................................46
2.7 CLASS OF SERVICE............................................................................................................................................47
2.7.1 Implementation of Class Of Service ............................................................................................................47
2.7.2 Application of Class Of Service...................................................................................................................49
2.7.3 Traffic Policing.............................................................................................................................................49
2.7.4 ATM Traffic Shaping....................................................................................................................................51
2.8 CLOCK SOURCE ..................................................................................................................................................53
2.9 THE M5 AND M10 INTERNET ROUTERS.............................................................................................................54
2.9.1 The Forwarding Engine Board...................................................................................................................54
2.9.2 Routing Engine.............................................................................................................................................55
2.9.3 Interfaces .......................................................................................................................................................55
2.9.4 Compact Size for Space Efficiency...........................................................................................................56
2.9.5 Power Supplies .............................................................................................................................................56
2.9.6 Cooling System ............................................................................................................................................57
2.9.7 The M10/M5 Craft Interface ......................................................................................................................57
2.9.8 Field Replaceable Units ..............................................................................................................................57
2.9.9 Target Applications......................................................................................................................................57
2.10 PRODUCTS SPECIFICATIONS...........................................................................................................................59