Joseph W. Doherty Wed, 12/17/2008 - 09:58
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"why are there 4 classes"


That's unclear from the defining RFC2597. My guess would be it was a good fit into the DSCP RFC2474 with minimum conflict to the earlier IP Precedence.


"which gives the lowest drop precedence"


AFx1, per RFC2597


"why not have 1 class with more drop precendences"


My guess would be to best conform with prior IP Precedence and especially with DSCP, RFC2474.

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