Moxa Technologies Moxa EtherDevice Switch EDS-508 - Manual (Page 48)

EDS-508 Series User’s Manual Featured Functions
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queue based on the IEEE 802.1p service level value defined in that packet. Service level markings
(values) are defined in the IEEE 802.1Q 4-byte tag, and therefore traffic will only contain 802.1p
priority markings if the network is configured with VLANs and VLAN tagging. The traffic flow
through the switch is as follows:
1. A packet received by the EDS may or may not have an 802.1p tag associated with it. If it
does not, then it is given a default 802.1p tag (which is usually 0). Alternatively, the packet
may be remarked with a new 802.1p value, which will result in all knowledge of the old
802.1p tag being lost.
2. Because the 802.1p priority levels are fixed to the traffic queues, the packet will be placed in
the appropriate priority queue, ready for transmission through the appropriate egress port.
When the packet reaches the head of its queue and is about to be transmitted, the device
determines whether or not the egress port is tagged for that VLAN. If it is, then the new
802.1p tag is used in the extended 802.1D header.
The EDS will check a packet received at the ingress port for IEEE 802.1D traffic classification,
and then prioritize it based upon the IEEE 802.1p value (service levels) in that tag. It is this 802.1p
value that determines which traffic queue the packet is mapped to.
Traffic Queues
The EDS hardware has multiple traffic queues that allow packet prioritization to occur. Higher
priority traffic can pass through the EDS without being delayed by lower priority traffic. As each
packet arrives in the EDS, it passes through any ingress processing (which includes classification,
marking/remarking), and is then sorted into the appropriate queue. The Switch then forwards
packets from each queue.
EDS supports two different queuing mechanisms:
# Weighted Fair: This method services all the traffic queues, giving priority to the higher
priority queues. Under most circumstances, this method gives high priority precedence over
low-priority, but in the event that high-priority traffic exceeds 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. This method always gives precedence to high
priority over low-priority.
Configuring Traffic Prioritization
QoS Classification