Moxa Technologies EDS-518A Series Inspect TOS, Inspect COS, Queuing Mechanism, Port Highest Priority

EDS-518A Series User’s Manual				Featured Functions
	Queuing Mechanism
		Setting	Description		Factory Default
	Weighted Fair		EDS-518A 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.		Weight Fair
	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.
	Port Highest Priority
		Setting	Description		Factory Default
	Enable/Disable		Set the Port Priority of the ingress frames to “High”		Disable
			queues.
	Inspect TOS
		Setting	Description		Factory Default
	Enable/Disable		Select the option to enable EDS-518A to inspect the		Enable
			Type of Service (TOS) bits in IPV4 frame to determine
			the priority of each frame.
	Inspect COS
		Setting	Description		Factory Default
	Enable/Disable		Select the option to enable EDS-518A to inspect the		Enable
			802.1p COS tag in the MAC frame to determine the
			priority of each frame.
NOTE	The priority of an ingress frame is determined in order by:
	1.	Port Highest Priority
	2.	Inspect TOS
	3.	Inspect CoS
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.

3-32