[Lucy] if MPLSoUDP and NVGREoUDP, underlying network only needs to handle UDP based load balancing, which presents a simpler solution for DC infrastructure. DC do not have to change today's DC device at all. This is the architecture metric I see. How many DC routers support GRE based load balancing today? Lucy
That ship has already sailed and the capability to do ECMP based on GRE key has already been incorporated into ASICs which enables ECMP based on standard-based MPLSoGRE (RFC2890 and RFC2784). Anyway, let's see what DC operators have to say about this. [Xiaohu] Ali, The following text is quoted from your draft (http://tools.ietf.org/html/draft-sajassi-nvo3-evpn-overlay-01) which was just submitted no more than two months ago, " As noted previously, there are existing core switches that do not support ECMP by hashing the GRE key; however, vast majority of existing core switches support ECMP by hashing UDP header; therefore, VXLAN encapsulation can provide better ECMP functions for these existing switches". Are you going to correct the above statement in a manner of U-turn in the next revision? Xiaohu [/Xiaohu] -Ali
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