User`s manual

EDS-405A/408A Series User’s Manual Featured Functions
3-43
low-priority, but in the event that high-priority traffic exceeds the link capacity, lower priority
traffic is not blocked.
y 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
The EDS supports inspection of layer 3 TOS and/or layer 2 QoS tag information to determine how
to classify traffic packets. (NOTE: The user interface for the EDS-408A shows 8 ports.)
Queuing Mechanism
Setting Description Factory Default
Weighted Fair
The EDS-405A/408A 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.
Strict
In the Strict-priority scheme, all top-priority frames
egress a port until that priority’s queue is empty,
and then the next lower priority queue’s frames
egress. This approach can cause the lower priorities
to be starved of opportunity for transmitting any
frames but ensures all high priority frames to egress
the switch as soon as possible.
Weight Fair