lp Eng Arc Aqm Ov Port Congestion Policy

This attribute specifies the congestion behavior of all ports on this FP. It applies only to transmit traffic and does not apply to the CBR service category. When the value is aggregate, the enqueue decision of cells or frames to a queue is based upon the congestion state of the entire port to which the queue belongs. A port is defined to be as congested as the most congested queue amongst all its queues. Thus, for example, if a nrtVBR queue is congested, the rtVBR queue also experiences discards even though the rtVBR queue may itself not be congested. Setting this attribute to aggregate assures that the low priority queues are also serviced in the event of congestion. If this attribute is set to aggregate then rtVBR must not be configured to do common queueing and its emissionPriority should be set to a number numerically smaller than or equal to 3. Another impact of setting this attribute to aggregate is that the per connection queue limits for nrtVBR and UBR connections will be increased to the link pool size and their discard thresholds will be modified to be aligned with the free list discard thresholds. When the value of this attribute is set to individualQueue, the enqueue decision of cells or frames to a queue is based solely upon the congestion state of that queue, not the port. This setting assures that the absolute priority of the traffic is taken into account, regardless of whether the lower priority queues are being served. On 3pOC3SmAtm2 and 3pOC3MmAtm2 cards, if more than one override component exists, they must have the same setting for this attribute. Otherwise, setting the attribute under one override component applies to the entire card.