Most Common BGP Communities

If you're interested in networking, then you've probably heard of the term "BGP community." But what are they? And what do they do?

In this blog post, we'll take a look at some of the most well-known BGP communities. We'll also discuss their functions and how they can be useful.

So if you're curious about BGP communities and want to learn more, keep reading!

or

You can check our BGP training course.

What is BGP Community?

BGP community is a BGP attribute that can be attached to a route to provide additional information and allow for more granular control in BGP routing decisions. BGP community values are optional and transitive, meaning they can be passed along from one BGP speaker to the next.

This allows for increased flexibility and customizability in BGP routing policies. BGP communities can also be used for hierarchical or organizational purposes, such as identifying routes belonging to a particular service provider or network segment.

What is the Purpose of a BGP Community?

The Border Gateway Protocol (BGP) is a fundamental component of the internet. It is responsible for routing traffic across networks and determining the most efficient path for data to travel. However, BGP was not originally designed to support complex network configurations, leading to issues such as suboptimal routing decisions and security vulnerabilities. This is where BGP communities come in.

A BGP community is a group of network nodes that share a common policy, allowing for better control and management of traffic on the Internet. This can include setting preferred paths for certain types of traffic, controlling the advertisement of routes to certain nodes, and defining actions to take if certain conditions are met.

BGP communities offer increased flexibility and customization for network routing policies. By assigning a community tag to an advertisement, network providers can apply custom configurations for specific types of traffic. This allows for more granular control over traffic flow and optimization based on factors like customer contracts or service level agreements. BGP communities also allow for the application of policies across multiple networks, allowing providers to easily coordinate and manage their routing strategies.

In addition, BGP communities can be used to enhance security by limiting the dissemination of sensitive information to specific nodes or groups. This helps to enhance security by limiting access to this sensitive information and preventing it from being inadvertently leaked outside of the assigned community.

Most Well-Known BGP Communities

When it comes to Border Gateway Protocol (BGP), communities are sets of route attributes that can be used for various purposes, such as routing and traffic engineering. The most commonly known BGP communities include No Export, No Advertise, and Graceful Shutdown. These communities provide highly valuable functions in networking and allow for more efficient routing decisions.

1. No Export

In the BGP routing protocol, a No Export community is used to prevent an announcement from being exported to any external BGP peers. This ensures that traffic intended for the local autonomous system stays within that system and does not get accidentally propagated outside of it. The No Export community can be applied both inbound and outbound on BGP announcements, allowing for fine-tuned control over which routes are shared with external peers. This can also be useful in troubleshooting routing issues or maintaining network security.

2. No Advertise

The No Advertise BGP community is a configuration option for Border Gateway Protocol (BGP) that tells a BGP speaker not to advertise a particular route to its neighbors. This feature can be useful in preventing certain routes from propagating to external networks while still allowing them to be used locally. It can also be helpful in troubleshooting network issues or controlling traffic flow. The No Advertise community is just one of many optional BGP attributes that can be used to fine tune network routing.

3. Graceful Shutdown

The Graceful Shutdown BGP community is used to control the behavior of a router during BGP session shutdown. When applied, it allows for the orderly withdrawal of routes and graceful closure of BGP peering sessions. This helps to minimize network disruption and ensure that all necessary updates are properly propagated in the network. The Graceful Shutdown community can be applied to a specific peer or globally, allowing for fine-tuned control over how the shutdown is handled. This can be a useful tool for facilitating network maintenance or making changes to routing configurations.

Final Words

The BGP community is a powerful tool to manage routing in your network. Using them lets you control how prefixes are handled and which routes are accepted or rejected. This allows for more fine-tuned traffic management and can help improve performance and stability. We encourage you to try them if you’re not already using BGP communities.

They may just be the tool you need to run your network like a well-oiled machine.

Have you ever used BGP communities in your network? What tips do you have for others who want to start using them?

You can learn about lots of BGP Communities in our CCIE Enterprise Infrastructure course.

Created by
Stanley Avery

I am a certified network engineer with over 10 years of experience in the field. I have a deep understanding of networking and IT security, and I am always looking for new challenges.

View profile

Daniel Lardeux
Daniel Lardeux Senior Network Consultant at Post Telecom

I passed the CCDE Practical exam and Orhan’s CCDE course was very important contributor to my success. I attended the CCDE course of Orhan Ergun in July and it was exactly what I needed, Orhan is taking the pain to break down the different technologies.

Roy Lexmond
Roy Lexmond Senior Network Designer at Routz CCDE #20150017 & CCIE R&S; #26557

After I attended Orhan Ergun’s CCDE course I passed the CCDE practical exam.I really enjoyed the course a lot ...

Nicholas Russo
Nicholas Russo Network Consulting Engineer (CCDE/CCIEx2), Cisc

I signed up for Orhan’s CCDE training. This training is very technically detailed and the use-cases, quizzes, scenarios, and mind maps are all great resources in the overall training program. Orhan teaches his students to think like a network designer ...

Slide Heading
Slide Heading Network Systems Engineer at Conscia A/S CCIE #42544 (SP) & CCDE #20160015

Orhan is forcing you to take off the implementation hat that most of us have been wearing for many years, instead he is providing a new fancy design hat, which makes you see and deal with the issues presented ...

Kim Pedersen
Kim Pedersen CCIE in RS and SP (#29189) CCDE#20170021

I’ve used Orhan’s self-paced CCDE training material. If you are interested in knowing how all the technologies go together in a coherent design i can highly recommend it.I also enjoyed the Quizzes which helped pick out my weak spots in selecting ...

Laurent Metzger
Laurent Metzger 3xCCIE/CCDE Senior Network Architect

Hi Orhan. I passed the CCDE exam on February 22. I read everything that you put on your Self Paced CCDE Training course and it was very helpful in my success. Thank you very much.

Martin J. Duggan
Martin J. Duggan Network Architect at AT&T;, Ciscopress Author CCDE #20160006 & CCIE#7942

I attended Orhan’s April 201610 days CCDE Bootcamp. I am CCDE now !

You can tell Orhan has a great deal of experience, it really comes through when he presents his design case studies and the CCDE Practical scenarios.

Muhammad Abubakar
Muhammad Abubakar Lead Network Architect – CCDE #20160016 2xCCIE #26693 2xJNCIE VCIX

Your excellent CCDE materials and amazing Bootcamp helped me tremendously through my learning journey.Also thank you very much for being available whenever I have a design question or a complex design topics. I can’t compare your design skills ...

Jennifer Pai
Jennifer Pai Network/Security Engineer at KNET Technology

Thanks Orhan very much for this course. It helped strengthen my “Network design mind”.

Ruslan Silyayev
Ruslan Silyayev Solution Architect at R.I.S.K Company

Training by Orhan is not a CCDE preperation training only. It will be useful for engineers which are dealing with design. You want to pass CCDE exam or learn network design, then don’t look at anywhere else!

Sameer Meher
Sameer Meher Solutions Architect at 23 Wards/Japan

Orhan Ergun’s CCDE course was really very good. CCDE Level Intelligence was delivered very well and with very useful case studies and the scenarios, I am thankful to Orhan for all his help!

Ken Young
Ken Young Senior Technical Architect Province of Nova Scotia, 2xCCIE #41597 | CCDE #20170047

If anyone wants to understand network design and architecture, also pass CCDE exam , I recommend you to attend Orhan’s online courses! I am a CCDE now but learning is a journey, we will be together in your other courses too Orhan!

Matt Cross
Matt Cross Technical Architect at Heartland – CCDE #2019::7

Orhan did an excellent job of filling in the gaps of knowledge that I had that took me to the finish line of the practical exam CCDE. The community of people that Orhan facilitates are both engaging and supportive of the journey to CCDE. Orhan ...

Shiling Ding
Shiling Ding Sentinel Technologies – CCDE #2019::12

Just passed the CCDE Practical exam! I attended Orhan Ergun’s CCDE training program , used Orhan’s Instructor Led and Self-Paced CCDE training and Online CCDE Practical Scenarios during my CCDE journey. Orhan’s CCDE In Depth book is an excellent summary ...

Abelardo Basurto
Abelardo Basurto Solutions Architect at Cisco Systems – CCDE 2018::6

Hi everyone, I’ve just passed the CCDE Exam. My Number is CCDE 2018::6 I attended to Online CCDE Bootcamp of Orhan. I want to thank Orhan not only for the great book and bootcamp, but also for his commitment, availability and willingness to assist the ...

Hady Mohamed Abdellah
Hady Mohamed Abdellah Network Architect Hamad International Airport Qatar – CCDE 2018::1

Hi guys, I’m so happy that I passed the exam. I’ve already got my number CCDE 2018::1. Thanks to Orhan for being the best CCDE instructor in the world. I highly recomend Orhan’s CCDE Training and In-Depth-CCDE ...

Bryan Bartik
Bryan Bartik Sr. Systems Engineer at CompuNet – CCDE 20170059

Hi Orhan I passed CCDE Practical exam on November 2017 ! I really enjoyed your materials and quizzes and use cases. They were definitely helpful in my preparation. Thanks a lot !

Giedrius Trapkauskas
Giedrius Trapkauskas Network Solutions Architect at Liberty Global – CCDE 20180004

I attended Orhan’s CCDE Training in Istanbul and it was very helpful in my preparation. I passed the exam recently and I want to say Thank you Orhan! For those who want to pass the CCDE exam, definitely start with ...

Alaa Issa
Alaa Issa Sr.Solutions Architect – CCDE#20180033 3xCCIE ( Collab|DC|Security )#27146

I registered to Orhan’s training in Feb 2017. From that time, I attended Orhan’s training several times. The depth of knowledge which Orhan has is amazing, and how to present such consistent knowledge to the ...

Mazin Ahsan Design Lead Engineer | Solutions Engineer | CCDE License # 20160030 | CCIE Licence # 23892

I passed the CCDE Practical Lab exam on November 17,2016 from supplications of elders and dedication from my Sensei Mr. Orhan Ergun I took different CCDE bootcamps in the past. Orhan has the most depth and expertise ...

Jeff Patterson CCDE# 2018::11

Hi Orhan I wanted to pass along my appreciation for the outstanding training material. I used the online CCDE training provided by Orhan as well as the In-Depth-CCDE book and passed the exam in February 2018. Thank you Orhan!

Mehdi Sfar
Mehdi Sfar Network and Security Architect / CCDE #20210003 | CCIE R&S; #51583

I signed up for Orhan’s CCDE Self paced Course. This course, along with the CCDE In Depth book, helped me for my CCDE Practical as well as Written exams. It pushed me to ask the "WHY" questions and allowed ...

Related courses