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PRG AV4202N
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Diffserv defines a field in IP packet headers referred to as DSCP. Hosts or
routers passing traffic to a Diffserv-enabled network will typically mark each
transmitted packet with an appropriate DSCP. The DSCP markings are used by
Diffserv network routers to appropriately classify packets and to apply particular
queue handling or scheduling behavior.
PRG AV4202N provides a table of predefined DSCP values, which are mapped
to 802.1p priority marking method. You can edit or delete any of the existing
DSCP setting, as well as add new entries.
1.
Click 'DSCP Settings' under the QoS tab in the 'Services' screen. The follow-
ing screen will appear
2.
To edit an existing entry, click its Edit action icon. To add a new entry, click
the 'New Entry' link. In both cases, the 'Edit DSCP Settings' screen will ap-
pear.
3.
Configure the following fields: DSCP Value (hex) Enter a hexadecimal num-
ber that will serve as the DSCP value. 802.1p Priority Select a 802.1p prior-
ity
level
from
the
combo-box
(each
priority
level
is
mapped
to
low/medium/high priority).
4.
Click 'OK' to save the settings.
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FIGURE 4.
DSCP Settings Panel
802.1P SETTINGS
The IEEE 802.1p priority marking method is a standard for prioritizing network
traffic at the data link/Mac sub-layer. 802.1p traffic is simply classified and sent
to the destination, with no bandwidth reservations established.
The 802.1p header includes a 3-bit prioritization field, which allows packets to
be grouped into eight levels of priority. PRG AV4202N maps these eight levels
to three main priorities: high, medium and low. By default, values six and seven
are mapped to high priority, which may be assigned to network-critical traffic.
Values four and five are mapped to medium priority, which may be applied to
delay-sensitive applications, such as interactive video and voice. Values three
to zero are mapped to low priority, which may range from controlled-load appli-
cations down to “loss eligible” traffic. The zero value is normally used for best-
effort traffic. It is the default value for traffic with unassigned priority.
1.
Click '802.1p Settings' under the QoS tab in the 'Services' screen. The fol-
lowing screen will appear
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PRG AV4202N
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QoS Section
2.
The eight 802.1p values are pre-configured with the three priority levels:
high, medium and low. You can change these levels for each of the eight
values in their respective combo-box.
3.
Click 'OK' to save the settings.
FIGURE 5.
802.1p Settings Panel
CLASS STATISTICS
PRG AV4202N
provides you with accurate, real-time information on the traffic
moving through your defined device classes. For example, the amount of pack-
ets sent, dropped or delayed, are just a few of the parameters that you can
monitor per each shaping class.
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To view your class statistics, click 'Class Statistics' under the QoS tab in the
'Services' screen. The following screen will appear. Note that class statistics will
only be available after defining at least one class (otherwise the screen will not
present any information).
FIGURE 6.
Class Statistics Panel
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