EDS-510A Series User’s Manual
Featured Functions
3-53
Queuing Mechanism
Setting
Description
Factory Default
Weighted Fair
EDS-510A 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
Port Highest 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
Inspect TOS
Setting
Description
Factory Default
Enable/Disable
Select the option to enable EDS-510A to inspect the
Type of Service (TOS) bits in IPV4 frame to determine
the priority of each frame.
Enable
Inspect COS
Setting
Description
Factory Default
Enable/Disable
Select the option to enable EDS-510A to inspect the
802.1p COS tag in the MAC frame to determine the
priority of each frame.
Enable
NOTE
The priority of an ingress frame is determined in order by:
1. Inspect
TOS
2. Inspect
CoS
3. Port
Highest
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.
