mscAtmIfCAUbrTxQueueLimit 1.3.6.1.4.1.562.36.2.1.114.3.6.100.1.12

This attribute specifies the default maximum queue length for the emission queues used to buffer the traffic of the UBR service category. It is used as the basis for setting the discard thresholds on both common and per-VC queues. For the common queue, the discard thresholds are set at approximately 35, 75 and 90 percent of the value of this attribute for traffic at discard priority 3 (DP=3), DP=2 and DP=1 respectively. For per-VC queue, the actual limit may be reduced depending on the shaping rate of the connection (for standard Vpt Vccs, this is the shaping rate of the Vpt). The discard thresholds are set at approximately 35, 75 and 90 percent of the scaled queue limit for traffic at discard priority 3 (DP=3), DP=2 and DP=1 respectively. However, a reduction will never result in a value that is less than the value set for the minPerVcQueueLimit attribute. When the value of this attribute is autoConfigure, an appropriate value is selected based on the card type. It is set to 1792 for low speed cards such as DS1, E1 and IMA, set to 2304 for high speed CQC-based ATM cards such as JT2, DS3, E3 and OC3, and set to 10240 for high speed ATM IP cards such as 3pDS3Atm2, 3pE3Atm2, 2pOC3SmAtm2 and 2pOC3MmAtm2. For the 1pOC12SmLrAtm card, the value is set to 4096. On CQC-based ATM cards, this attribute must be set to the same value for CA NrtVbr, Abr and Ubr components, and the valid range is from 5 to 30000 inclusive. For ATM IP FPs, the per-VC queue limit may be overridden for a permanent connection by specifying a value in the Vcd Tm or Vpd Tm txQueueLimit attribute. The operational value of the maximum length of a queue (common or per-VC) is indicated by the Vcc Tm, Vpc Tm, or Vpt Tm txQueueThresholds attribute. For standard Vpts, this attribute does not apply when using per-VC queuing and only applies when using common queueing. When using per-VC queueing, regardless of the Vpt's service category, standard Vpts use the AtmIf Ca NrtVbr txQueueLimit value as their default. This attribute does not apply to basic Vpts. VALUES ( 0 = autoConfigure )