Introduction to the Junos Operating System

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Introduction to the Junos Operating System Chapter 2: Junos Operating System Fundamentals

Fundamentals 2012 Juniper Networks, Inc.

2 Chapter Objectives After successfully completing this chapter, you will be able to: Describe the Junos operating system and its basic design architecture Explain traffic processing for transit and exception traffic Identify and provide a brief overview of Junos devices 2-2

architecture Explain traffic processing for transit and exception

3 Agenda: Junos Operating System Fundamentals The Junos OS Traffic Processing Overview of Junos Devices 2-3

4 The Junos OS Robust, modular operating system Provides industry-leading performance and scalability Based on the FreeBSD UNIX operating system 2-4

providing a consistent set of features that are implemented

5 Single Software Train A single software train for all platforms running the Junos OS Eases management overhead by providing a consistent set of features that are implemented in a consistent manner J2320 TX Matrix 2-5

6 Separation of Control and Forwarding All platforms running the Junos OS share a common design goal: Clean separation of control and forwarding functions Routing Engine RT FT The Junos OS Control Plane Internal Link Forwarding Plane Frames/Packets In FT Packet Forwarding Engine Frames/Packets Out 2-6

Routing Engine RT FT The Junos OS Control Plane Internal Link Forwarding Plane

7 Routing Engine Maintains routing and forwarding tables Controls and monitors the chassis Manages the PFE RT Routing Engine FT The Junos OS Control Plane Forwarding Plane Packet Forwarding Engine 2-8

PFE RT Routing Engine FT The Junos OS Control Plane

8 Packet Forwarding Engine Uses Layer 2 and Layer 3 forwarding tables, provided by the RE, to forward traffic toward its destination Implements various services such as policing, stateless firewall filtering, and class of service Frames/Packets In Control Plane Forwarding Plane Routing Engine FT Packet Forwarding Engine Frames/Packets Out 2-9

stateless firewall filtering, and class of service Frames/Packets In Control Plane

9 Agenda: Junos Operating System Fundamentals The Junos OS Traffic Processing Overview of Junos Devices

10 Transit Traffic Processing Transit traffic is forwarded through the local system PFE uses the forwarding table provided by the RE Examples of transit traffic include unicast and multicast traffic Control Plane Forwarding Plane Routing Engine CPU FT Frames/Packets In Packet Forwarding Engine Frames/Packets Out

include unicast and multicast traffic Control Plane Forwarding Plane Routing

Exception Traffic Processing (1 of 2) Exception traffic is processed by the local system Traffic destined for the local system is processed by RE CPU In most cases, the PFE processes traffic

11 Exception Traffic Processing (1 of 2) Exception traffic is processed by the local system Traffic destined for the local system is processed by RE CPU In most cases, the PFE processes traffic requiring the generation of ICMP messages, such as TTL expired Control Plane Forwarding Plane Routing Engine CPU Frames/Packets In Frames/Packets Out Packet Forwarding Engine

requiring the generation of ICMP messages, such as TTL expired Control Plane Forwarding Plane

Exception Traffic Processing (2 of 2) Exception traffic is rate-limited on the internal link to protect the RE from potential DoS attacks Control traffic is given

12 Exception Traffic Processing (2 of 2) Exception traffic is rate-limited on the internal link to protect the RE from potential DoS attacks Control traffic is given preference when congestion exists Routing Engine Control Plane CPU Forwarding Plane Built-In Rate Limiting Frames/Packets In Packet Forwarding Engine

preference when congestion exists Routing Engine Control Plane CPU Forwarding Plane

13 Agenda: Junos Operating System Fundamentals The Junos OS Traffic Processing Overview of Junos Devices

14 Overview of Junos Devices Platforms running the Junos OS span switching, routing, and security roles and are suited for small to large networks in both enterprise and service provider environments Routing Switching Security

for small to large networks in both enterprise and service

15 Junos Routing Devices ACX Series LN Series M Series MX Series PTX Series T Series

16 Junos Switching Devices EX Series QFX Series

17 Junos Security Devices J Series SRX Series

18 Summary In this chapter, we: Described the Junos OS and its basic design architecture Explained how transit and exception traffic is processed Identified and provided a brief overview of Junos devices

exception traffic is processed Identified and provided

19 Review Questions 1. What are some advantages of the Junos OS? 2. What are the primary functions of the control plane and the forwarding plane on Junos devices? 3. How are transit and exception traffic processed? 4. Name three platforms that run the Junos OS

20 Worldwide Education Services

Juniper Operating System Fundamental for APNIC Training Lab. APNIC Technical Workshop June 18, 2015, APNIC Office In-house training.

Juniper Operating System Fundamental for APNIC Training Lab APNIC Technical Workshop June 18, 2015, APNIC Office In-house training. Acknowledgment APNIC training lab facilitate hands-on training and workshop