On the ‘net: BGP as an SDN

There are probably a dozen other ways to influence the path in this situation using a route reflector in BGP. Each of these methods have advantages and disadvantages; for instance, flowspec and segment routing can classify traffic based on the source address, or other fields in the packet header, while modifying just the destination will modify the flow for every packet destined to F. But what’s interesting here is not the specific mechanisms used and their limitations, but rather that the RR can be treated as a controller which modifies the base BGP routing information using only mechanisms available within BGP itself. —ECI

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