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Multihoming to a single ISP

A while ago Greig asked an interesting question:
Would it be possible to explain in detail a scenario where dual-as and as-overide is being used and another scenario where dual-as (using no-prepend / replace-as), as-overide and remove-private-as are used?
I decided to start from the last item. The neighbor remove-private-as option is used in scenarios where you run BGP between public and private AS numbers to collect IP prefixes and advertise these prefixes to the rest of the world as belonging to the public AS. The most common design in this category is multihoming to a single ISP.

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