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QMultiFlex-400™ Installation and Operating Handbook
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The source and/or the destination address in the IP packet along with the source
and/or the destination port number of the TCP or UDP header in the packet. Any or
all of these can be used in any combination at the same time, including using a range
of port numbers.
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The 6-bit Differentiated Services Code Point (DSCP) value in the IP packet header.
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The 3-bit Priority Code Point field of an IEEE 802.1Q VLAN tag (also referred to as
an IEEE 802.1p Priority Tag).
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The VLAN ID in an IEEE 802.1Q VLAN tag.
The key classifiers are described in the following sections. The result is that each incoming
packet is assigned to one of a number of QoS classes. Data will be classified as belonging
to the first class in the list for which a match is found starting from the top. If no match is
found, then the packet is assigned a default class that corresponds to a priority level of seven
(lowest). The default data stream gets a BIR value assigned to of 100% (equal to the transmit
data rate of the modem).
In addition to the stream classification, each stream can be associated with a particular DVB-
S2/S2X MODCOD when transmitted as part of the shared outbound carrier (VCM), with the
MODCOD being matched to the satellite signal strength being received by a particular
remote modem. When multiple streams are disabled then all packets will be transmitted
using the same MODCOD.
8.7.8.4.1 IP Address
A data stream can be classified based on either the source and/or the destination addresses
in the IP packet as well as by a range for the source and/or the destination port numbers in
the TCP or UDP header in the packet.
The example in Figure 8-8 shows a traffic shaping scheme based on matching on source
and destination addresses and port numbers. In this example the shared outbound consists
of a single MODCOD (not shown).
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