Thursday, October 14, 2021

BGP Optimal Route Reflection 101

Almost a decade ago I described a scenario in which a perfectly valid IBGP topology could result in a permanent routing loop. While one wouldn’t expect to see such a scenario in a well designed network, it’s been known for ages1 that using BGP route reflectors could result in suboptimal forwarding.

Here’s a simple description of how that could happen:


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