HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 321

Table 7-2. Assured Forwarding PHB
AF Class Drop Precedence
AF1 low
medium
high
AF2 low
medium
high
AF3 low
medium
high
AF4 low
medium
high
For example, you can define three subclasses with AF1. The third subclass
would have a higher drop precedence that the first two. If the AF13 traffic
exceeded its limits, the router would drop packets that matched this
traffic class, rather than packets from AF12 or AF11. (Note that this means
the AF1 class with DSCP 10 receives better service than AF13 with
DSCP 14.)
You cannot configure drop precedence or buffer space on the ProCurve
Secure Router (although you can mark packets for networks that do
consider such specifications). You can configure bandwidth indirectly by
assigning certain AF classes a specific proportion of an interface's band-
width with CBWFQ.
Expedited Forwarding PHB—The Expedited Forwarding PHB ensures
that the packet receives guaranteed bandwidth and the best level of
service. This PHB ensures that the traffic has low latency, low jitter, and
low loss.
A standard DSCP for the Expedited Forwarding PHB is 46.
On the ProCurve Secure Router, you can configure a low-latency queue
for packets marked with the DSCP for the Expedited Forwarding PHB.
You should reserve the Expedited Forwarding PHB for mission-critical
applications. Using this PHB for a majority or all of the traffic defeats the
purpose of QoS.
Setting Up Quality of Service
DSCP DiffServ Value
001010 10
001100 12
001110 14
010010 18
010100 20
010110 22
011010 26
011100 28
011110 30
100010 34
100100 36
100110 38
Overview
7-9