Moxa EDS-518E-4GTXSFP-T [71/116] Cos classification

Managed Ethernet Switch (UI_2.0_FW_5.x) Featured Functions

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marking/re-marking), and is then sorted into the appropriate queue. The switch then forwards packets from

each queue.

Moxa switches support two different queuing mechanisms:

• Weight Fair: This method services all the traffic queues, giving priority to the higher priority queues.

Under most circumstances, the Weight Fair method gives high priority precedence over low priority, but in

the event that high priority traffic does not reach the link capacity, lower priority traffic is not blocked.

• Strict: This method services high traffic queues first; low priority queues are delayed until no more high

priority data needs to be sent. The Strict method always gives precedence to high priority over low priority.

Configuring Traffic Prioritization

Quality of Service (QoS) provides a traffic prioritization capability to ensure that important data is delivered

consistently and predictably. The Moxa switch can inspect IEEE 802.1p/1Q layer 2 CoS tags, and even layer 3

TOS information, to provide a consistent classification of the entire network. The Moxa switch’s QoS capability

improves your industrial network’s performance and determinism for mission critical applications.

CoS Classification

Scheduling Mechanism

Setting Description Factory Default

Weight Fair The Moxa switch has 4 priority queues. In the weight fair

scheme, an 8, 4, 2, 1 weighting is applied to the four priorities.

This approach prevents the lower priority frames from being

starved of opportunity for transmission with only a slight delay

to the higher priority frames

Weight Fair

Strict In the Strict-priority scheme, all top-priority frames egress a

port until that priority’s frames egress. This approach can cause

the lower priorities to be starved of opportunity for transmitting

frames but ensures that

all high priority frames will egress the

switch as soon as possible.