Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 110
QoS
QoS (Quality of Service) is a method to guarantee a bandwidth relationship between
individual applications or protocols. A communications network transports a multitude of
applications and data, including high-quality video and delay-sensitive data such as real-
time voice. Networks must provide secure, predictable, measurable, and sometimes
guaranteed services. Achieving the required QoS becomes the secret to a successful end-
to-end business solution.
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.
High flexibility is provided in 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 frame. It uses a super priority queue with dedicated memory and strict
highest priority in the 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.
QoS > Port Classification
This page lets you configure basic QoS Classification settings for all switch ports.
Port: The port number for which the configuration below applies.
COS: Controls 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
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