Network Load Control
168
8.4
QoS/Priority
UM Basic Configuration L3P
Release
7.1
12/2011
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 8 priority queues (IEEE 802.1D standard traffic
classes). Received data packets are assigned to these classes by
Access Control Lists, MAC- or IP-based ACLs (see on page 109 “Access
Control Lists (ACL)”).
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 (see on
page 81 “Configuring the Ports”) and when the port was configured to
“trust dot1p”.
Default setting: “trust dot1p”.
The device takes account of the classification mechanisms in the above
order. This means that the Access-Control Lists always take priority over the
following mechanisms. AccessControl Lists can classify the data packets
relative to Layer 2, Layer 3 and Layer 4 (e.g. MAC addresses, IP addresses,
protocols, TCP/UDP ports).
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