https://archive.nanog.org/meetings/nanog55/presentations/Monday/Lapukhov.pdf and the RFC is https://tools.ietf.org/html/draft-ietf-rtgwg-bgp-routing-large-dc-01
Note that normally, when BGP RIBs are exchanged by two routers, if both sit in the same AS, then while their RIB will show the path, it will be marked with an "i", and that path will not be advertised to the outside world. If we instead give an AS to each rack and then use BGP it can be still made to work because each ASN is considered a private ASN.
Note that normally, when BGP RIBs are exchanged by two routers, if both sit in the same AS, then while their RIB will show the path, it will be marked with an "i", and that path will not be advertised to the outside world. If we instead give an AS to each rack and then use BGP it can be still made to work because each ASN is considered a private ASN.
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