Handling Of Traffic Classes; Setting Prioritization - Hirschmann RS20 User Manual

Network Load Control
8.4.5

Handling of traffic classes

For the handling of traffic classes, the device provides:

Strict Priority
Description of Strict Priority

With the Strict Priority setting, the device first transmits all data packets
that have a higher traffic class (higher priority) before transmitting a data
packet with the next highest traffic class. The device transmits a data
packet with the lowest traffic class (lowest priority) only when there are no
other data packets remaining in the queue. In unfortunate cases, the
device never sends packets with a low priority if there is a high volume of
high-priority traffic waiting to be sent on this port.
In delay-sensitive applications, such as VoIP or video, Strict Priority
allows Strict Priority data to be sent immediately.
8.4.6

Setting prioritization

Assigning the Port Priority

 Select the
 In the "Port Priority" column, you can specify the priority (0-7) with
which the device sends data packets which it receives without a
VLAN tag at this port.
 In the column "Trust Mode", you have the option to control which
criterion the the device uses to assign a traffic class to received data
packets (see on page 128 "Description of
Note: If you have set up VLANs, pay attention to the "VLAN 0
Transparent mode" (see Switching:VLAN:Global)
UM BasicConfig L2E
Release 8.0 05/2013
QoS/Priority:Port Configuration
8.4 QoS/Priority
dialog.
Prioritization").
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