On 2/6/15, 2:27 PM, "Brian E Carpenter" <brian.e.carpenter@xxxxxxxxx> wrote: >On 07/02/2015 08:05, Piers O'Hanlon wrote: >> >> On 6 Feb 2015, at 18:24, Richard Shockey wrote: >> >>> >>> Fine now how do you get the labeling/queueing across the AS boundary? >>>I >>> don¹t know any ISP that accepts or recognizes the packet labeling of >>> another AS. >>> >> Sure - that's another whole ballgame! A number of ISPs blow away the >>DSCP bits in packets from and to the home, as I understand they use >>their own set of DSCPs internally. > >That is entirely in keeping with the diffserv architecture, which is >explicit that DSCPs are domain-specific and that traffic may be >reclassified at domain boundaries. (Which is what operators wanted >when diffserv was designed.) > >> But agreements of use across boundaries aren't that clear and probably >>wouldn't generally be extended to end users. > >Agreements across boundaries require mutual trust, so it's to be >expected that ISPs will reclassify traffic arriving from subscribers. >For ISP/ISP boundaries, see >http://tools.ietf.org/html/draft-ietf-tsvwg-diffserv-intercon > >> I guess they're also using things like MPLS, or SDN (e.g. Google B4) >>for traffic engineering. > >Diffserv isn't traffic engineering, however. Well Brian after Feb 26 we don¹t know what DIFFSERV will be. It may be illegal unless you can define what a ³specialized service², ³reasonable network management² or ³commercially reasonable² actually is.