3Com 3500 - 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 an d packet
loss by physical port and queue (reserved, high, best, an d 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 stat istic 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 no t 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 p ackets 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 enab le intelligent
discard of traffic in a congestion situation. When the system is
congested, you can decide which traffic can be d iscarded and mark
that traffic as loss eligible.