Moxa Technologies Moxa EtherDevice Switch EDS-508 - Manual (Page 49)

EDS-508 Series User’s Manual Featured Functions
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MOXA EtherDevice Switch supports inspection of layer 3 TOS and/or layer 2 CoS tag
information to determine how to classify traffic packets.
Queuing Mechanism
Setting Description Factory Default
Weight Fair
EDS-508 has 4 priority queues. In the weighted 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
Inspect TOS
Setting Description Factory Default
Enable/Disable
Check the checkbox to enable EDS-508 to inspect the
Type of Service (TOS) bits in IPV4 frame to
determine the priority of each frames.
Enable
Inspect COS
Setting Description Factory Default
Enable/Disable
Check the check box to enable EDS-508 to inspect the
802.1p COS tag in the MAC frame to determine the
priority of each frame.
Enable
Default Port Priority
Setting Description Factory Default
Low/Normal/
Medium/High
Set the Port Default Priority of the ingress frames to
different priority queues. If the received packets are
not equipped with any tag information (CoS, TOS) the
default port priority will take effect.
Normal
NOTE The priority of an ingress frame is determined in order by:
1. Inspect TOS
2. Inspect CoS
3. Default Port Priority
NOTE The designer can enable these classifications individually or in combination. For instance, if a
‘hot,’ higher priority port, is required for a network design, “Inspect TOS” and “Inspect CoS” can
be disabled. This setting leaves only port default priority active, which results in all ingress frames
being assigned the same priority on that port.