I very much doubt that marketing issues were a significant issue. Off-the-shelf OS networking has always fallen short of supporting
it wasn't made for that.
As someone else already mentioned in this thread, supporting hardware offload for forwarding is a major issue. Core routers (or even provider-edge routers) depend on most of the packet forwarding being done in proprietary hardware. Operating system IP stacks don't support this very well; all of the routers I've worked on used the kernel IP stack only for packets going to and from the kernel itself, and used a different stack for what I call "transit" packets -- those that are only being forwarded by the local system.
as higher speed routers are "hardware" - why OS has to do ANY work on routing?
it's just there to prepare routing tables in format required for routing ASIC's and put them there!
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