HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 333

Setting Up Quality of Service
Configuring CBWFQ
Each QoS map entry can use only one set of criteria to match traffic. To match
another group of traffic, you must configure another entry.
Enter one of the match commands shown in Table 7-6 to select traffic.
Different options for the match command will be discussed separately in the
following sections.
Classifying Traffic According to a ToS Value. WFQ allocates relatively
more bandwidth to traffic with higher IP precedence (or DiffServ values).
Simple WFQ must use this formula:
(IP precedence value +1)/sum of all (IP precedence values +1)
With CBWFQ, you can control how much bandwidth the router assigns to a
class defined by a ToS value.
You would create an entry for each ToS value your system uses and then enter
this command:
Syntax: match [dscp <value> | precedence <value>]
Valid DiffServ (DSCP) values are from 0 to 63; valid IP precedence values are
from 0 to 7. For example:
ProCurve(config-qos-map)# match precedence 5
N o t e
This ToS value is set by an application or device before the packet arrives on
the interface. Although the router can mark traffic with ToS values, these
values are generally used in the network to which the router forwards the
packet.
DiffServ defines four classes of AF PHB, each class receiving successively
better service. (The first subclass in an AF class receives better treatment
because it has a lower drop precedence.) You could configure four classes to
match four AF PHB and allocate each successive class relatively more band-
width. (See Table 7-7 for the DSCP for AF PHB.)
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