Avaya P580 User Manual page 658

Chapter 24
24-6
Table 24-2. Buffer Detail Configuration Dialog Box
Parameter Definition...
High Priority Displays the percent of the buffer's queuing space allotted to
Allocation high priority traffic. Because the high-priority queue is
serviced more frequently than the normal priority queue,
raising this value may not necessarily provide better service.
In fact, if you are using the high-priority queue for delay-
sensitive traffic, you may want to reduce the amount of
memory devoted to the high-priority queue. This ensures that
packets that cannot be delivered in a timely manner are
discarded. If you want the high priority queue to guarantee
delivery of as many packets as possible, regardless of delay,
increase this value. The change does not take effect until you
reset the switch.
Priority Allows you to set this parameter to the value at which the
Threshold switch starts sending packets to the high-priority queue. The
default value (4) causes all traffic with a priority greater than
or equal to 4 (4, 5, 6, and 7) to be assigned to the high-
priority queue. Priority schemes have more than two queues
(the IEEE allows up to 8, numbered 0 through 7). Avaya
recommends that you do not change this parameter.
High Priority Allows you to set how many times the high priority queue is
Service Ratio serviced for each time the low priority queue is serviced. The
ideal value changes from queue to queue, but the goal is to
ensure that traffic mix guarantees optimal mix between high-
priority and best effort traffic.
High and Displays the number of packets dropped because the
Normal associated buffer is full. Indicates that the device
Overflow immediately before the queue is processing traffic faster than
Drops the next downstream element can process the same volume
of traffic. For example, overflow drops on the input buffer
indicate that traffic is arriving faster than the switch matrix
can process it. Overflow drops on the output buffers
indicates that the output port cannot handle the volume of the
load being offered.
High and Displays the number of packets dropped because they timed
Normal Stale out waiting for service (using the age timer value). In the
Drops high-priority queue, this can help determine how efficiently
the switch is processing "better never than late" traffic.
Excessive stale drops on the high-priority queue may
indicate the need to increase the service ratio on the high-
priority queue.
Congestion Displays the number of packets dropped because the switch
Drops controller has sensed congestion at the outbound port.
User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0
2 of 2