What is the border gateway protocol (BGP)?
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- Опубликовано: 7 сен 2016
- Routing on the internet is actually performed between autonomous systems (ASes). Those autonomous systems need a way to determine how to send data to ASes that they are not directly connected with. To do this, the use the border gateway protocol, or BGP. By exchanging routing announcements using BGP routers located in each autonomous system can eventually build up a routing table allowing them to determine the best way to reach any other AS connected to the internet.
Credits: Talking: Geoffrey Challen (Assistant Professor, Computer Science and Engineering, University at Buffalo). Producing: Greg Bunyea (Undergraduate, Computer Science and Engineering, University at Buffalo).
Part of the www.internet-class.org online internet course. A blue Systems Research Group (blue.cse.buffalo.edu) production.
After long beating around the bush videos about BGP , finally found one explained in a nutshell.... well explained
damn, watched 4 other videos and none made sense, watched this 7 min videos and it clicked. Thank you.
WOW!! I am a UB student and I didn't realize he taught at UB unless I heard him say University at Buffalo. Amazing video!!
Makes the concept very straight-forward :)
InstaBlaster...
Great video with a clear example!
Great explanation!
very good explanation!! Thanks for sharing this video
Good explanation! I wish there was someone who could go deeper then this. There is so much more to BGP. This is the high level aspect.
I bet there's a video somewhere
Packet Pushers channel on here. Russ White BGP course.
Simple and clear -- Thanks.
Explained on the best way!!! :)))
Thank you so much, very well explained.
Great job! We had an outage at work and I couldn't figure out why but this makes sense now
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Impressive. Thank you for sharing
good explanation I ever came across
Awesome explanation!
Very well explained :)
Benedict Rodrigues z xxxcom
It is the best explianation out in the internet. ❤♥
Excellent explanation!!!!
thanks facebook for upgrading my networking knowledge
Thank you ..nice explanation..was having difficulty understanding Azure VPN Gateway BGP setting
Not to throw stones in the glass house. but what you explained here was Distance vector protocol. BGP use Path vector protocol which is somewhat like Distance vector protocol but is'nt exacly the same and should be explained in more details. BGP performs “path vector” routing by advertising a vector of paths (lists of ASes) rather than just distances (hop counts.).
Also Paths between autonomous systems are sometimes rerouted manually, due to that BGP is traffic insensitive and does'nt responed to traffic jams on the links.
Where are you man??
Need more content from you man?? Loving your videos
Here's my understanding:
- IP routing tables are used *within* Autonomous Systems (i.e. a set of network administered by the same authority -e.g. a corporate network). IP Routing tables are great, but they have to be *manually configured* by a router admin.
- Because the Internet is made of many independent Autonomous Systems, there is a need for a routing protocol that can *autonomously learn routing routes* . That's why BGP was introduced.
Correct?
A home LAN is an example of an autonomous system. All computers, iPad, iPhone, nest cameras, smart TV etc on a LAN have a routing table, which typically has three routes. However the router, provided by your ISP, for your LAN has a large routing table that constantly needs to be updated. Routes need to be added in the routers table or existing routes need to be modified. These updates are sent by other routers on the internet (outside of your home LAN). For routers to be able to talk to each other there needs to be a protocol. That protocol is BGP.
Routing tables are used on all routers. “Autonomously learn” has nothing to do with any of this.
when you have bike ride at 9 but computer network class at 8.
Thx golf explanation 😎
Made it soo easy!
Thanks!
Thanks for that, i will continue researching. i have some questions. how does the the protocol handle a new connection or a miss one? :))
Well done
well done :)
finally someone explained it
Hello! Found this on the description of this great explanatory video of BGP:
To do this, the use the border gateway protocol, or BGP.
It should say To do this, theY use the border gateway protocol, or BGP, thanx.
Jo
BGP
- border gateway protocol
- 자율시스템(AS) 간의 라우팅 프로토콜
- 초기에 BGP 라우터들이 연결될 떄에는 전체 경로 제어표(Routing Table)을 교환하고, 이후에는 변화된 정보만을 교환한다.
awesome!
BGP is how edge or border routers in an AS forward packets to the next AS to get to their destination.
I like that intro
kicked off with spawn sound effect from battlefront 2
clear explanation! My question is: what is the "cost" you mentioned? The cost is the RTT(Round Trip Time)?
Number of hops
This raises more questions.. Because I still don't understand how the data is being send from one AS to another. Is there a cable or wireless signal? Allowing them to talk to each other?
How does it get 'advertised'? Is there a a big database that any of the companies can look into each time? Like how do they know which AS has 242.156.21.34 in it's domain
Thanks
Life saver
Hey prof, great little explainer. Right now in Canada the Rogers network is down, and I read a post about how currently Rogers isn't advertising its presence (which is what lead me here). Do you (or anyone else) have any thoughts on what could cause something like this to happen creating a nationwide outage? The internet is wild man.
I come here to revise my concepts , what could have happened in Canada is as we all know routers are mechanical parts and they deteriorate with time and that's why its so important to maintain them, so in this case the Rogers may have become faulty and as it might have been a major router and majority of traffic might be flowing through it so as it became faulty the entire network broke .But you will see that only around 60 % people might have been affected this is because we have other major routers too , so one reason is the network centers aren't maintaining the routers properly and these are mostly government organizations so you must ask government questions as you guys are paying your taxes , hopefully its not a big deal but such kind of thing can make the nation lose a lot of money and power even though its negligible it shouldn't happen . The same situation happened in my country India during 2005 but I am happy we are doing quite well now .
Thanks, it saves me from exam tomorrow
good joke
awsome
Thank you! Are the autonomous systems ISPs for example????? I'm confused! Could u explain what a border router is?
Yes they could be an ISPs
Is this an example of Link State or Distance vector in the principal that neighbors update each others forwarding tables?
To answer this question abit late. Here he explains distance vector protocol which for example RIP, RIPv2 and older protocolls which BGP decends from uses. Except BGP is abit different and it actually use Path vector protocol
POV: you are watching this after the Facebook outage to understand how BGP works
excatly
So am I just missing it or what? Over what kind of connection do the clouds talk to one another? Nobody ever mentions it boggles me mind ;)
Sorry cause I think I am a little late to reply.
At first, A knows how to reach to A, so it broadcasts itself to its neighbours. Now B and C knows that A is directly connected to them, so their routing tables are respectively B:0, A:1 and C:0, A:1. Now both of them broadcasts themselves and reaches D. So now D knows how to reach to B and C and they know how to reach to A. So D's routing table looks like D:0, B:1, C:1, A:B:2, A:C:2. Now D broadcasts itself and B and C know that they can reach D. Their routing tables get updated. When B gets the routing table of D, it ignores the value of A, because it knows that it has a direct connection, but update the connection for C. The same for C. When B and C re-advertise themselves, A gets itself back, and now it knows the route to D. Finally, A broadcasts, but no effect, since B, C and D already know the minimum cost paths to everywhere. Now the process it complete.
For practical purposes, this routers advertise themselves periodically, or when there is a change in one or more of the links.
If the clouds A B C D are far away those connection are probably a fibers that run under the ground to give physical connection
Big fan brroooo
Isn’t this like distance vector routing?
Artyte B.
Sort of but hop count is not used as a metric. Autonomous systems are used to gauge distance from one point to another. BGP update messages are sent between routers that include NLRI and path attributes, which are used to determine which routes are best.
All routers have this BGP table or just some "special" routers?
👏👏👏
Who is here after facebook’s global outage ?
Just the nerds :>
Me 😂
good
I am here because Facebook is down :V
you look like a discount Jason Statham :D
lmfaoo
He could def kick some AS
On the 6 minute mark you say that B knows 2 ways to send packets to C, but B doesn't have advertisement from D that it can reach C. What is the logic with that statement?
Why can't b send that stuff directly to c
jesse pinkman?
ROO-TUR
B is directly connected to A. How it is one hop away then.
Only oneself is 0 hop. Directly connected ones are 1 hop.
A directly connected router is 1 hop away. It’s networking fundamentals.
Kinda misleading since you made it look like a distance vector routing protocol
@Omar Aziz What is the difference between the two?
“When the protocol is bootstrapping itself…” I don’t like this phrase because boot has a very specific meaning in computer technology. Protocols do not boot or bootstrap themselves.
Think an example with a real world use case would have been better.
The way he explains BGP, very confusing.
This video basically explains "routing" in a nutshell. Not specifically BGP though.
this things can save many life....for them able to make it to heaven..
-:compare to me with Google, have thousand heart and brains...so it's up to them
It sounds great but it is very basic in my point of view. He needs to explain more with more information which would be useful in the professional environment.
here because of the facebook crash
lmao same
I beleave you understand what you are talking about but I think there is mutch easier they to explain it.
Who's here because of Facebook?
You look like Jessie Pinkman!
...if Jessie didn't smoke meth
I was looking for this comment
Sounds ridiculously vulnerable
thank you Jesse Pinkman,
who came here after Facebook outage...lol
Since when did Jesse Pinkman take up networking?
Bla. Bla. Bla...time waist..
Thanks!