Too expensive to do in an ASIC. There is a reason the MAC table is bigger than the routing table on a chip, because it is cheaper. Think of an ASIC as a box tha

Too expensive to do in an ASIC. There is a reason the MAC table is bigger than the routing table on a chip, because it is cheaper. Think of an ASIC as a box that can be divided up in to smaller boxes that are an index. The total number of boxes is limited by the size of the ASIC. The bigger chip, the more box and greater the cost. To do MAC forwarding it takes 2 boxes. To do routing it takes 5. To do an ACL match it takes 14. This is the reason OpenFlow never really worked on switches at scale. What you are asking for is someone simpler to MPLS and that is an expensive feature die size wise. I have highly oversimplified this post, but it is mostly correct at a 1000ft level.