> Compared to MPLS, a L2 solution with 100 Gb/s interfaces between > core switches and a 10G connection for each buildings looks so much > cheaper. But we worry about future trouble using Trill, SPB, or other > technologies, not only the "open" ones, but specifically the proprietary > ones based on central controller and lots of magic (some colleagues feel > the debug nightmare are garanteed). > > If you had to make such a choice recently, did you choose an MPLS design > even at lower speed ?
A year ago we built NREN backbone using TRILL instead of MPLS. 40 POPs, no central controller, RFC standardized TRILL protocol i.e. L2 routing using IS-IS, no STP. See my recent presentation at http://md.bts.sk/sanet-100g-2.pdf for more details. Much easier to setup, operate & maintain than MPLS and obviously much lower cost. Based on 6-months production experience, my recommendation would be to stay away from MPLS in the campus. With kind regards, M.