Qos/Priority; Description Of Prioritization - Hirschmann RS20 User Manual

Network Load Control

8.4 QoS/Priority

8.4.1

Description of Prioritization

This function helps prevent time-critical data traffic such as language/video
or real-time data from being disrupted by less time-critical data traffic during
periods of heavy traffic. By assigning high traffic classes for time-critical data
and low traffic classes for less time-critical data, this provides optimal data
flow for time-critical data traffic.
The device supports 4 priority queues (IEEE 802.1D standard traffic
classes). Received data packets are assigned to these classes by

the priority of the data packet contained in the VLAN tag when the
receiving port was configured to "trust dot1p".
 the QoS information (ToS/DiffServ) contained in the IP header when the
receiving port was configured to "trust ip-dscp".
 the port priority when the port was configured to "untrusted".
 the port priority when receiving non-IP packets when the port was
configured to "trust ip-dscp".

the port priority when receiving data packets without a VLAN tag
page 77 "Configuring the Ports")
"trust dot1p".
Default setting: "trust dot1p".
The device takes account of the classification mechanisms in the above
order.
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and when the port was configured to
8.4 QoS/Priority
(see on
UM BasicConfig L2E
Release 8.0 05/2013