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AWS spent years rebuilding its routing control plane without taking the network down

There's another way to fix iBGP scaling besides route reflectors. Almost nobody talks about it at work.

BGP Confederations. Sub-ASes. eBGP-like sessions inside your own AS.

Confederations split one AS into sub-ASes. From outside you're still one AS. Inside, sub-ASes use eBGP-like sessions.

Full mesh stops being your problem.

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Version devBuilt at: 2026-10-11 02:37:10 EDT

AWS spent years rebuilding its routing control plane without taking the network down

There's another way to fix iBGP scaling besides route reflectors. Almost nobody talks about it at work.

BGP Confederations. Sub-ASes. eBGP-like sessions inside your own AS.

Confederations split one AS into sub-ASes. From outside you're still one AS. Inside, sub-ASes use eBGP-like sessions.

Full mesh stops being your problem.