BGP - Determining the next hop IP (next-hop-self)
When a BGP router advertises a particular network it has learned to its BGP neighbors, the next hop IP it will advertise along with that route depends upon whether it is an eBGP peer or an iBGP peer.
An iBGP peer will advertise the route without changing the next hop IP while an eBGP peer will advertise the route with itself as the next hop IP. In this video, I will explore this behavior in more detail. We will also see why BGP has been designed in this way, and the various ways we can overcome any problems that this behavior may produce, including the next-hop-self feature.
Chapter list:
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00:00 Introduction
00:42 How the Next Hop is Handled
01:32 Next Hop IP Example
03:32 How iBGP and eBGP treat the next hop
04:24 Problems that can arise
05:30 Solutions to the problem
06:16 Next Hop Self
07:34 Why does BGP behave like this?
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 Attribute Categories - • BGP Attribute Categories - well-known...
BGP Official Definition RFC 4271 - https://datatracker.ietf.org/doc/html...
#bgp #nexthopIP #next-hop-self #ibgp #ebgp #bgpattributes #lazarusagapidis