Junos Enterprise Routing, 2nd Edition

What’s in This Book?

The ultimate purpose of this book is to be the single most complete source for working knowledge related to Juniper Networks enterprise routing. Although you won’t find much focus on actual packet formats and fields, topics for which there is already plentiful coverage on the Internet and in bookstores, you will find how to deploy Junos technology effectively in your network.

Here’s a short summary of the chapters and what you’ll find inside:

Chapter 1, Junos in the Enterprise Network

This chapter provides an overview of the hardware and software architecture on Juniper enterprise routers, as well as an overview of the Junos CLI for both new and experienced users. It then provides a description of the Juniper enterprise devices, walking through the various model families and providing a brief definition of the services, capabilities, and usages of each device.

Chapter 2, Enterprise Design

This chapter provides a set of design guidelines for the enterprise network. It presents the methodology for enterprise design and a series of network scenarios that illustrate the changes you can make to networks to improve their efficiency, security, and connectivity.

Chapter 3, Juniper Switching and Routing Platforms

This chapter provides the usage recommendations for Juniper enterprise devices. Many devices offer overlapping features and capabilities, and this chapter looks at these capabilities and positions the devices within the enterprise network.

Chapter 4, Interfaces

This chapter provides an overview of Junos interface organization. Then, it dives into some of the most common interface types and configurations seen in networks today. Finally, it concludes with a troubleshooting section with real-life scenarios seen every day.

Chapter 5, Protocol Independent Properties and Routing Policy

This chapter provides a condensed but comprehensive overview of Junos Protocol Independent Properties (PIPs), such as static and aggregate route, and of the Junos routing policy, which is used to control route advertisement, redistribution, and attribute manipulation.

Chapter 6, Interior Gateway Protocols and Migration Strategies

This chapter provides a detailed review of Interior Gateway Protocol (IGP) operation, and then focuses on multivendor deployments of the Routing Information Protocol (RIP) and Open Shortest Path First (OSPF). The material also focuses on IGP migration strategies and includes an EIGRP-to-OSPF migration case study.

Chapter 7, Border Gateway Protocol and Enterprise Routing Policy

After providing a detailed review of what the Border Gateway Protocol (BGP) is and how it can benefit an enterprise, this chapter provides a series of case studies that build in complexity, starting with a single homed network with no Internal BGP (IBGP) speaker and ending with a multihomed-to-multiple-providers scenario, to include a redundant IBGP route reflection design that avoids running IBGP on all internal routers. The policy treatment is focused on practical enterprise routing goals, and it details both inbound and outbound policy, including autonomous system (AS) path regex matching and BGP attribute manipulation.

Chapter 8, Access Security

This chapter provides an overview of a large variety of security concepts and the tools available to deploy them. These tools include user authentication and authorization, remote access, firewall filters, policers, Unicast Reverse Path Forwarding, the Simple Network Management Protocol (SNMP), and syslog.

Chapter 9, Junos Layer 2 Services

This chapter provides an overview of the Layer 2 services that can be deployed on a Juniper Networks router. Layer 2 services include features such as link bundling, Generic Routing Encapsulation (GRE), and link aggregation.

Chapter 10, Class of Service

This chapter provides an overview of IP class of service (CoS) and includes a detailed primer on IP DiffServ. The material then details the similarities and differences in CoS handling between the different platforms, which is a common source of confusion. A practical CoS case study serves as the foundation for CoS deployment and operational verification. The chapter also demonstrates the Virtual Channel CoS feature.

Chapter 11, IP Multicast in the Enterprise

Multicast tends to see little deployment and is a common area of confusion. This chapter details IP multicast concepts, provides an overview of multicast protocols, and then demonstrates several Physical Interface Module (PIM) sparse mode scenarios, to include PIM sparse mode with static, bootstrap, and Anycast-RP. Through all the examples, practical verification and fault isolation steps are provided.

Chapter 12, Junos Security Services

This chapter includes descriptions of the security services found in the J-series Services Routers and SRX Services Gateways. NAT, VPNs, UTM, and security policies are explained with configuration examples of each.

Appendix A

This appendix covers the legacy Layer 3 service set as found on older Junos versions and the M-series devices, hence its appendix status. NAT, IPSec VPNs, and stateful filters are covered, as well as configuration examples for each. This appendix also covers interface and next-hop service sets, with a comparison of where each should be used.

Appendix B

This appendix covers the methods that are available for upgrading a Junos device to a newer version of the operating system. Storage cleanup methods and memory extension capabilities are covered, and examples are provided for maximizing a device’s flash memory.

In addition, you can also use this book to attain one of the Juniper Networks certification levels related to enterprise routing. To that end, each chapter includes a set of review questions and exam topics that have been covered, all designed to get you thinking about what you’ve just read and digested. If you’re not in the certification mode, the questions will provide a mechanism for critical thinking, potentially prompting you to locate other resources to further your knowledge.

Topology of This Book

Figure 1 displays this book’s routing topology, which appears beginning in Chapter 4. It consists of 11 J-series routers running version 10.4R1.9 and 2 Cisco routers running IOS Release 12.3(15b). The Cisco routers are primarily employed in Chapter 6, where they are used for both RIP interoperability and as part of an EIGRP-to-OSPF migration exercise. The topology uses only Gigabit Ethernet and T1 interfaces; however, other interface types are examined in Chapter 4. You might recognize the hostnames of the routers, which all relate to a beverage that was created more than 7,000 years ago (with evidence to consumption) in Mesopotamia. The names are chosen due to the international appeal of the resultant product and for its food value only, as beer is an excellent way to preserve the nutritional value of grain.

Figure 1. This book’s topology