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Implementing BGP in a Service Provider Network

Implementing BGP in a Service Provider Network

This course is part of Configuring BGP on Cisco Routers Specialization

Instructor: Cisco Learning & Certifications

Included with

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5 modules

Gain insight into a topic and learn the fundamentals.

Beginner level

No prior experience required

9 hours to complete

Flexible schedule

Learn at your own pace

5 modules

Gain insight into a topic and learn the fundamentals.

Beginner level

No prior experience required

9 hours to complete

Flexible schedule

Learn at your own pace

Skills you'll gain

Details to know

Shareable certificate

Add to your LinkedIn profile

Assessments

29 assignments¹

AI Graded see disclaimer

Taught in English

91% of learners achieved a positive career outcome

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Build your subject-matter expertise

This course is part of the Configuring BGP on Cisco Routers Specialization

When you enroll in this course, you'll also be enrolled in this Specialization.

Learn new concepts from industry experts
Gain a foundational understanding of a subject or tool
Develop job-relevant skills with hands-on projects
Earn a shareable career certificate

There are 5 modules in this course

Unlock the complex world of internet routing with this specialized course on transit autonomous systems (AS). Designed for network engineers and IT professionals, you’ll explore how a transit AS operates as the backbone for global data exchange, efficiently routing traffic that originates from or is destined for locations outside its own network. Through engaging modules, learn how BGP (Border Gateway Protocol) interacts and coordinates with internal routing protocols (IGPs) to maintain consistent and reliable network connectivity.

What sets this course apart is its in-depth focus on the unique challenges of configuring and troubleshooting a multihomed transit AS. You’ll discover the intricacies of IBGP and EBGP interaction, the importance of recursive route lookups, and the use of IBGP monitoring and troubleshooting commands to solve real-world network issues. By completing this course, you’ll gain practical skills to design, maintain, and troubleshoot transit AS environments, making you an asset for any organization managing complex interconnections across the Internet. Join and advance your expertise where robust routing meets practical problem-solving—empowering you to support the backbone of modern digital communication.

Module details

What's included

2 readings

All transit autonomous systems are required to carry traffic originating from or destined for locations outside of that AS. For the transit AS to meet this requirement, there has to be interaction and coordination between BGP and the IGP that this particular AS uses. Such a configuration requires special care to ensure consistency of routing information throughout the AS. The topology of the Internet can be viewed as a series of connections among stub networks, multihomed networks, and transit autonomous systems. A transit AS is a multihomed AS that contains more than one connection to the outside world and that allows traffic not originating in that AS to travel through it. This course introduces the concept of the multihomed transit AS and how BGP exchanges routing information inside the AS and between neighboring autonomous systems. It also explains the requirement for IBGP within the multihomed transit AS.

What's included

5 videos6 readings7 assignments

5 videosTotal 9 minutes

Introduction video for Working with a Transit AS1 minute
Transit AS Tasks1 minute
External Route Propagation2 minutes
Packet Forwarding in an AS2 minutes
Core Router IBGP Requirements in a Transit AS2 minutes

6 readingsTotal 27 minutes

Transit AS Tasks5 minutes
External Route Propagation4 minutes
Internal Route Propagation4 minutes
Packet Forwarding in an AS5 minutes
Core Router IBGP Requirements in a Transit AS6 minutes
Summary - Working with a Transit AS3 minutes

7 assignmentsTotal 77 minutes

Working with a Transit AS Course Exam25 minutes
Knowledge Check4 minutes
Knowledge Check - External Route Propagation6 minutes
Knowledge Check - Internal Route Propagation3 minutes
Knowledge Check - Packet Forwarding in an AS3 minutes
Knowledge Check - Core Router IBGP Requirements in a Transit AS6 minutes
Describe the functions of a transit AS30 minutes

Configuring a BGP network in a transit services configuration requires special care to ensure consistency of routing information throughout the AS. Understanding the interaction between EBGP and IBGP is crucial to successfully configuring and troubleshooting the transit AS.

What's included

10 videos10 readings10 assignments1 peer review

10 videosTotal 23 minutes

Introduction Video for Interacting with IBGP and EBGP in a Transit AS1 minute
AS Path Processing in IBGP2 minutes
Multipath Load Sharing in BGP2 minutes
BGP Split Horizon2 minutes
IBGP Full Mesh3 minutes
IBGP Neighbours2 minutes
IBGP Next-Hop Processing3 minutes
Transit Network Using Edge Routers as Next Hops Example2 minutes
Differences Between EBGP and IBGP Sessions3 minutes
Scalability Limitations of IBGP-Based Transit Backbones2 minutes

10 readingsTotal 55 minutes

AS Path Processing in IBGP5 minutes
Multipath Load Sharing in BGP7 minutes
BGP Split Horizon5 minutes
IBGP Full Mesh7 minutes
IBGP Neighbours7 minutes
IBGP Next-Hop Processing6 minutes
Transit Network Using Edge Routers as Next Hops Example5 minutes
Differences Between EBGP and IBGP Sessions6 minutes
Scalability Limitations of IBGP-Based Transit Backbones4 minutes
Summary 3 minutes

10 assignmentsTotal 80 minutes

Interacting with IBGP and EBGP in a Transit AS Course Exam40 minutes
Knowledge Check - AS Path Processing in IBGP6 minutes
Knowledge Check - Multipath Load Sharing in BGP6 minutes
Knowledge Check4 minutes
Knowledge Check - IBGP Full Mesh3 minutes
Knowledge Check - IBGP Neighbours3 minutes
Knowledge Check - IBGP Next-Hop Processing3 minutes
Knowledge Check - Transit Network Using Edge Routers as Next Hops Example6 minutes
Knowledge Check - Differences Between EBGP and IBGP Sessions3 minutes
Knowledge Check - Scalability Limitations of IBGP-Based Transit Backbones6 minutes

1 peer reviewTotal 60 minutes

IBGP and EBGP inter-working in a transit AS60 minutes

A transit AS requires interaction between EBGP and IBGP and between IBGP and an IGP in the transit AS. This course describes packet forwarding through a transit AS and discusses the requirements for successful packet forwarding, such as recursive route lookup and an IGP in the transit AS. This course concludes with a discussion of the interaction between IBGP and an IGP running within the transit AS.

What's included

4 videos6 readings6 assignments

4 videosTotal 12 minutes

Forwarding Packets in a Transit AS1 minute
Packet Forwarding in a Transit AS4 minutes
Routing Protocols in a Transit AS4 minutes
Problems with BGP and IGP Interaction4 minutes

6 readingsTotal 34 minutes

Packet Forwarding in a Transit AS7 minutes
Recursive Lookup in Cisco IOS Software7 minutes
Routing Protocols in a Transit AS7 minutes
BGP and IGP Interaction6 minutes
Problems with BGP and IGP Interaction4 minutes
Summary 3 minutes

6 assignmentsTotal 55 minutes

Forwarding Packets in a Transit AS Course Exam30 minutes
Knowledge Check - Packet Forwarding in a Transit AS6 minutes
Knowledge Check - Recursive Lookup in Cisco IOS Software3 minutes
Knowledge Check - Routing Protocols in a Transit AS6 minutes
Knowledge Check4 minutes
Knowledge Check - Problems with BGP and IGP Interaction6 minutes

Introducing a transit backbone into a BGP network can create unique troubleshooting challenges. This course introduces IBGP monitoring commands and troubleshooting techniques for solving the most common IBGP problems that you might encounter in a transit backbone. Common problems with IBGP, as discussed in this course, occur when IBGP sessions do not reach the established state, when routing information that is received via IBGP is never selected and when the best BGP route is never installed in the routing table.

What's included

4 videos7 readings6 assignments

4 videosTotal 7 minutes

Introduction video for Monitoring and Troubleshooting IBGP in a Transit AS1 minute
Monitoring IBGP2 minutes
Troubleshooting IBGP Session Startup Issues2 minutes
Troubleshooting IBGP Route Selection Issues2 minutes