EDS-405A/408A Series User’s Manual
Featured Functions
3-45
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
Inspect TOS
Setting
Description
Factory Default
Enable/Disable
Select this setting to enable the EDS-405A/408A 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 this setting to enable the EDS-405A/408A 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
