Hi Curtis,
Idr should not be adding a hack for small gain in FIB size when better techniques exist and products already exist with quite a few binary orders of magnitude headroom.
This is not a hack. In fact all what this is about can be accomplished today by sitting down and configuring three routers: edge, lookup router and egress (an option). If someone really want to divide the addressing space as Paul suggest marking can be reg community. This is provider contained solution - it does not cross any inter-as boundaries.
All this document attempts to is present such option for operators. Some may find them useful some may not.
Moreover there are other then edge FIB scaling real operational benefits for such solutions ... to name one I want to point at very fast reachability restoration in the event of failure.
To meet customer's and today's applications requirements one can forget about hop by hop switching, sending withdraws network wide, re-propagate new best paths etc ... That is gone model.
To meet such requirements requires to store backup paths for all destinations in FIB ahead of any failure + make sure that such router have very fast failure detection scheme. Every one could see that the less routers are configured with accelerated restoration features it scales much better ... or it allows for much faster OS upgrades on such boxes vs running around and upgrading all edge boxes.
Imagine also vast reduction in number of BFD sessions if someone would choose to use this technology for ASBR/PE failure detection.
Another one assuming that we would go one step fwd and remove RIB from the edge and just fully mesh those couple of IP lookup routers any problems with oscillations are history as well as vast reduction in intra-as triggered BGP instabilities.
For the FIB reduction indeed small/mid size ISPs or enterprise networks may benefit.
But for not directly mentioned in the draft benefits of moving to schemes which reduces the number of FIB lookup routers in the network many ISPs may be interested. And indeed I would like to hear their opinion on the list on that.
Cheers, R. _______________________________________________ Idr mailing list Idr at ietf.org https://www.ietf.org/mailman/listinfo/idr