3Com 3500 - Manual (Page 741)

qos statistics transmit 741
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qos statistics transmit For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Displays QoS transmit statistics.
Valid Minimum Abbreviation
q s t
Important Considerations
■
The transmit statistics help you track bandwidth utilization and packet
loss by physical port and queue (
reserved , high , best , and low ).
■
The RSVP and network control packets go out on the reserved queue.
■
When you mark any packet ( conforming or excess ) as loss
eligible , the packet is dropped if the transmit queue for which it is
destined is over its threshold. A packet that is marked loss-eligible falls
into one of the two
highLoss statistic categories:
■
If the transmit queue is not over its threshold, the packet is sent
and counted as a
highLossSent packet.
■
If the transmit queue is over its threshold, it is dropped and
counted as a
highLossDropped packet.
■
If you do not mark a packet as loss-eligible, it falls into one of the
three
lowLoss statistics.
■
If the queue is not over the threshold, it is counted as a
lowLossSent .
■
If the queue is over its threshold, it is counted as
lowLossDelayed .
■
If the queue is full, it is counted as lowLossDropped .
■
Loss-eligible packets are conforming packets that are discarded
instead of queued when transmit queues back up beyond a threshold.
You can specify whether conforming packets (as well as
nonconforming excess packets) are loss-eligible when you define a
control. Marking packets loss-eligible is useful to enable intelligent
discard of traffic in a congestion situation. When the system is
congested, you can decide which traffic can be discarded and mark
that traffic as loss eligible.