> On May 24, 2015, at 11:02 AM, Simon Barber <si...@superduper.net> wrote: > > Hi Roland, > > My recent attention to DSCP has come from looking at what correct mappings to > 802.1D (now 802.1Q) would be. I have also run across a couple of comments > that legacy IP Precedence maps CS1 -> higher priority than BE. Do you have > any knowledge of how prevalent this interpretation would be today, and > whether it happens in any place that would be a problem? (i.e. are there > applications that would generate these values, and rely on the behaivour, or > routers that mis-prioritize things at places that are likely a bottleneck)? > I.E. How important is it to consider these legacy behaivours today? > > Simon
What, specifically, does this have to do with the subject line? Could I trouble you to change the subject line, or at least reference a current internet draft? > On 5/18/2015 8:52 AM, Bless, Roland (TM) wrote: >> CS1 is maybe a problem because originally (rfc 2474) CS1 means better >> priority than CS0. At that point in time of RFC3662 the discussion was to >> use CS1, because also in 802.1p 1 means "background". However, this >> inconsistency makes it now hard to rely on any semantics of DSCP CS1. IIRC >> the Diffserv chairs were opposed to spend another DSCP on LE and therefore >> proposed to use an existing one. In retrospect, this seems to have been a >> wrong decision given the problems of rtcweb and so on these days. > >> Regards, Roland >
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