On Fri, 31 May 2019 00:10:42 -0000, Mel Beckman said: > What are you talking about? Do you use multi homed BGP? If so, Iâd expect > you > to know that an organization with multiple sites having their own Internet > still uses a single AS. They have IGP paths to route traffic between sites > (e.g., by using dedicated circuits).
The situation being discussed is an organization with multiple sites that *don't* have a behind-the-scenes dedicated circuit, tunnel, or other interconnect. For example, XYZ Corp has a POP in Tokyo announcing a /16 to their provider there, and a POP in DC announcing a different /16 to their North American provider, using the same ASN for both - but traffic between the two /16s traverses the commodity Internet. Or they advertise the same /16 and pray to the anycast gods. :) (Actually, that's OK too, as long as both Tokyo and DC also announce a second route (possibly a more-specific, or different address space) for their interconnect needs)
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