On Friday, September 02, 2011 10:49:32 PM Jeff Saxe wrote:
Seriously, I would expect that most public Internet carriers, unless you paid them extra fees to pay attention to the DSCP markings, would completely ignore them and treat it all as best-effort traffic, right up to and including the last-mile circuit that should be the congestion point at which QoS would be most useful to differentiate. I don't think it would be the stated policy of any public ISP to drop other-than-zero-marked packets, especially if it's a transit somewhere that's out of reach of either you or the other customer you're trying to reach.
I think that DSCP 0 is safest for Internet traffic. As such, if a network is going to deploy QoS, they would do well to implement this safety net for Internet traffic so that said traffic doesn't fall victim to restrictive policies of non-0 DSCP strategies, or just as equally, doesn't get scheduled with a better advantage than is necessary, as that would cost money. Mark.