Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
110
of
473
6. Quality of Service
The switch supports four QoS queues per port with strict or weighted fair queuing scheduling. It supports QoS
Control Lists (QCL) for advanced programmable QoS classification, based on IEEE 802.1p, Ethertype, VID,
IPv4/IPv6 DSCP and UDP/TCP ports and ranges.
It provides high flexibility in the classification of incoming frames to a QoS class. The QoS classification looks for
information up to Layer 4, including IPv4 and IPv6 DSCP, IPv4 TCP/UDP port numbers, and user priority of tagged
frames. This QoS classification mechanism is implemented in a QoS control list (QCL). The QoS Class assigned to
a frame is used throughout the device for providing queuing, scheduling, and congestion control guarantees to
the frame according to what was configured for that specific QoS class.
The switch supports advanced memory control mechanisms providing excellent performance of all QoS classes
under any traffic scenario, including jumbo frames. The switch provides superior priority queueing with
dedicated memory and strict highest-priority arbitration. The ingress super priority queue allows traffic
recognized as CPU traffic to be received and queued for transmission to the CPU even when all the QoS class
queues are congested.
Port Classification
This page lets you configure basic QoS Ingress Classification settings for all switch ports. To configure QoS
Ingress Port Classification in the web UI:
1.
Click Quality of Service and Port Classification.
2.
Scroll to select QoS Ingress Port parameters.
3.
Click Apply to save the settings.
4.
To cancel the settings click the Reset button. It will revert to previously saved values.
5.
Click “PCP Classification“ to go to the next page “Port PCP Classification”.
Figure 6-1: QoS Ingress Port Classification
Parameter descriptions
:
Port
: The port number for which the configuration below applies.
Queue Priority
: Select the default CoS value. All frames are classified to a CoS. There is a one to one mapping
between CoS, queue and priority. A CoS of 0 (zero) has the lowest priority. If the port is VLAN aware, the frame
is tagged and Tag Class. is enabled, then the frame is classified to a CoS that is mapped from the PCP and DEI
value in the tag. Otherwise the frame is classified to the default CoS.
The classified CoS can be overruled by a QCL entry. The valid range is 0 (default) to 7 (highest priority).
