User`s manual

PT-G7509 User’s Manual Featured Functions
3-45
QoS Classification
The PT-G7509 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 the PT-G7509 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.
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.
Inspect TOS
Setting Description Factory Default
Enable/Disable Enables or disables the PT-G7509 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 Enables or disables the PT-G7509 to inspect the 802.1p
COS tag in the MAC frame to determine the priority of
each frame.
Enable