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
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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