On 26 Mar 2009, at 00:54, Dylan Hall wrote:
Why is it necessary to use a layer 2 QoS marking at all?
With my European operator hat[0] on - hello - every now and then, I notice that someone within the UK community requests similar features. Normally this is followed by a flurry of responses along the lines of, "This exchange is a neutral layer two segment, it should forward frames, all frames, to their intended destination in the most neutral way possible." So how do we handle capacity issues ? Simple, it says in our terms that you are forbidden to congest your port. There are carrot and stick ways to do this - at LONAP we hassle you until you do :-) and at LINX they invoice you a surcharge for congesting your port. We sell the exchange on the benefits of peering - improved speed of access, reduced latency, more capacity. If participants are congesting their ports, then these benefits nolonger ring true. Your exchange ports are one of the easiest places to have capacity on your network, so my opinion, an operator should work hard to keep spare capacity. Exchanges can help by making the cost per bit at capacity lower for busy 10GE ports than for busy 1GE ports. [0] Board member, LONAP - www.lonap.net, and noc/peering@ a large number of networks connected to LONAP, LINX, AMS-IX. Best wishes Andy -- Regards, Andy Davidson, CTO, NetSumo Limited T: +44 (0) 20 7993 1700 W: http://www.netsumo.com