Network load control
10.4
QoS/Priority
122
UM Config GRS
Release
8.0
09/2019
10.4
QoS/Priority
QoS (Quality of Service) is a procedure defined in IEEE 802.1D which is used to distribute
resources in the network. QoS lets you prioritize the data of necessary applications.
When there is a heavy network load, prioritizing helps prevent data traffic with lower priority from
interfering with delay-sensitive data traffic. Delay-sensitive data traffic includes, for example, voice,
video, and real-time data.
10.4.1
Description of prioritization
For data traffic prioritization, traffic classes are defined in the device. The device prioritizes higher
traffic classes over lower traffic classes. The number of traffic classes depends on the device type.
To provide for optimal data flow for delay-sensitive data, you assign higher traffic classes to this
data. You assign lower traffic classes to data that is less sensitive to delay.
Assigning traffic classes to the data
The device automatically assigns traffic classes to inbound data (traffic classification). The device
takes the following classification criteria into account:
Methods according to which the device carries out assignment of received data packets to traffic
classes:
trustDot1p
The device uses the priority of the data packet contained in the VLAN tag.
trustIpDscp
The device uses the QoS information contained in the IP header (ToS/DiffServ).
untrusted
The device ignores possible priority information within the data packets and uses the priority
of the receiving port directly.
The priority assigned to the receiving port.
Both classification criteria are configurable.
During traffic classification, the device uses the following rules:
When the receiving port is set to
trustDot1p
(default setting), the device uses the data packet
priority contained in the VLAN tag. When the data packets do not contain a VLAN tag, the device
is guided by the priority of the receiving port.
When the receiving port is set to
trustIpDscp
, the device uses the QoS information (ToS/
DiffServ) in the IP header. When the data packets do not contain IP packets, the device is
guided by the priority of the receiving port.
When the receiving port is set to
untrusted
, the device is guided by the priority of the receiving
port.
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