Avaya 580 Manual Do Utilizador

25-42

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1

Chapter 25

For information about how CBWFQ works, see “

” earlier in this 

chapter.

* Note:  The switch does not drop packets on egress queue 7, even if you 

specify the drop keyword. This restriction ensures that traffic 
management packets are not discarded by the bandwidth-
limiting functions. In spite of the ability of egress queue 7 to 
exceed its bandwidth limit, the queue is subject to a fairness 
mechanism that prevents other queues (6 through 0) from being 
starved. Note that, when you specify drop, the bandwidth of 
queue 7 is limited if lower priority queues require service and 
have not reached their bandwidth guarantee.

The maximum size burst that is serviced by 
WFQ once the normal burst has been 
exceeded. Bursts that are smaller than this 
size are serviced by WFQ. Bursts that are 
larger than this size are dropped. If you set 
this threshold to the same value as normal 
burst, the maximum burst capability is 
disabled. 

The maximum burst can range from the 
normal burst size to 15,000.Avaya 
recommends a value of 6000. 

Increase the maximum burst setting as the 
burstiness of the traffic increases. 

The maximum burst setting must be 

greater than or equal to the normal 
burst.  

Enter this setting in a multiple of four. If you 
do not enter a multiple of four, the switch 
rounds down the number that you enter to a 
multiple of four. For example, if you enter a 
maximum burst size of 43 byes, the switch 
converts the setting to 40 bytes.If you enter a 
maximum burst size of 0,1,2 or 3, the switch 
stores a value of 0 and no data is forwarded 
from the queue.

The weight that you want to assign to the 
queue. Weights can range from 1to 254.