BGP - What is the BGP Cluster List Attribute?
The Cluster List BGP attribute is part of a mechanism used by iBGP Route Reflectors to prevent routing loops. BGP Route Reflectors introduce an effective way to overcome the limitations of the iBGP full mesh peering that is required within an autonomous system. However, when we use Route Reflectors, we are bypassing another important rule that iBGP uses: The iBGP split horizon rule, a rule used to prevent routing loops. For this reason, we need another mechanism to prevent routing loops, and that's where the Cluster List comes in.
In this video, we'll explore the Cluster List attribute that is exchanged between iBGP routers and how it helps to prevent routing loops in a Route Reflector environment.
Chapter list:
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00:00 Introduction
00:14 iBGP RRs Bypass the split horizon rule
01:26 The Cluster List is a BGP Attribute
02:22 What is a Cluster?
03:17 Rules Governing Route Reflectors
03:55 What is the CLuster List Attribute?
06:20 Clusters with Multiple Route Reflectors
07:14 Cluster List Rules and Behavior
09:05 Summary
Other videos mentioned in this video:
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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...
Video: BGP - Understanding the iBGP Split Horizon Rule - • BGP - Understanding the iBGP Split-Ho...
Video: BGP - What are iBGP Route Reflectors? - • BGP - What are iBGP Route Reflectors?
Video: BGP - Route Reflectors Basic Configuration on Cisco IOS - • BGP - Route Reflectors Basic Configur...
Video: BGP - What is the BGP Originator ID? - • BGP - What is the BGP Originator ID?
Other 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 ...
BGP Official Definition RFC 4271 - https://datatracker.ietf.org/doc/html...
BGP Route Reflectors Definition RFC 1966 - https://datatracker.ietf.org/doc/html...
#bgp #ibgp #bgpcluster #clusterlist #bgpattribute #routereflector #lazarusagapidis