BGP - Understanding the iBGP Split-Horizon Rule
The iBGP split-horizon rule states that an iBGP router must not advertise any route it has learned from one iBGP peer to another iBGP peer. That's a little strange right? Well, in this video I'll be describing this rule in more detail, including how it works, why it is necessary, and what would happen if the rule is not followed. Finally, we'll examine under what circumstances this rule must be violated in order for other mechanisms to function correctly.
If you want to find out more about the BGP routing protocol, or the method by which attributes are used to determine the best path, and other interesting features of the protocol, take a look at some of my other videos linked below (after the chapter list...)
Chapter list:
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00:00 Introduction
00:24 What is the iBGP Split-Horizon Rule?
01:54 iBGP Full Mesh Peering
04:02 Why is the split horizon rule needed?
05:17 Exceptions to the Rule
06:00 Route Reflectors
06:45 BGP Confederations
08:01 Selective advertisements and multipath
09:12 Summary
Related links and videos:
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Video: What is BGP? - • BGP - What is it?
Video: eBGP vs iBGP - What's the difference? - • BGP - eBGP vs iBGP - What's the diffe...
Video: BGP attributes and determining the best path - • BGP - BGP Attributes and Determining ...
Video: BGP - Why does BGP require an IGP to function? - • BGP - Why does BGP require an IGP to ...
Video: BGP - Why does iBGP require full mesh peering? - • BGP - Why does iBGP require full mesh...
BGP Official Definition RFC 4271 - https://datatracker.ietf.org/doc/html...
#ibgp #splithorizonrule #ibgprouter #internetrouting #routingprotocol #routereflectors #lazarusagapidis #networking