Shaping Granularity Values for Enhanced Queuing Hardware

Due to the limits placed on shaping thresholds used in the hierarchy, there is a granularity associated with the Enhanced IQ2 (IQ2E) PIC and the Enhanced Queuing (EQ) DPC. For these hardware models, the shaper accuracies differ at various levels of the hierarchy, with shapers at the logical interface level (Level 3) being more accurate than shapers at the interface set level (Level 2) or the port level (Level 1). Table 1 shows the accuracy of the logical interface shaper at various rates for Ethernet ports operating at 1 Gbps.

Table 1: Shaper Accuracy of 1-Gbps Ethernet at the Logical Interface Level
Range of Logical Interface Shaper	Step Granularity
Up to 4.096 Mbps	16 Kbps
4.096 to 8.192 Mbps	32 Kbps
8.192 to 16.384 Mbps	64 Kbps
16.384 to 32.768 Mbps	128 Kbps
32.768 to 65.535 Mbps	256 Kbps
65.535 to 131.072 Mbps	512 Kbps
131.072 to 262.144 Mbps	1024 Kbps
262.144 to 1 Gbps	4096 Kbps

Table 2 shows the accuracy of the logical interface shaper at various rates for Ethernet ports operating at 10 Gbps.

Table 2: Shaper Accuracy of 10-Gbps Ethernet at the Logical Interface Level
Range of Logical Interface Shaper	Step Granularity
Up to 10.24 Mbps	40 Kbps
10.24 to 20.48 Mbps	80 Kbps
10.48 to 40.96 Mbps	160 Kbps
40.96 to 81.92 Mbps	320 Kbps
81.92 to 163.84 Mbps	640 Kbps
163.84 to 327.68 Mbps	1280 Kbps
327.68 to 655.36 Mbps	2560 Kbps
655.36 to 2611.2 Mbps	10240 Kbps
2611.2 to 5222.4 Mbps	20480 Kbps
5222.4 to 10 Gbps	40960 Kbps

Table 3 shows the accuracy of the interface set shaper at various rates for Ethernet ports operating at 1 Gbps.

Table 3: Shaper Accuracy of 1-Gbps Ethernet at the Interface Set Level
Range of Interface Set Shaper	Step Granularity
Up to 20.48 Mbps	80 Kbps
20.48 Mbps to 81.92 Mbps	320 Kbps
81.92 Mbps to 327.68 Mbps	1.28 Mbps
327.68 Mbps to 1 Gbps	20.48 Mbps

Table 4 shows the accuracy of the interface set shaper at various rates for Ethernet ports operating at 10 Gbps.

Table 4: Shaper Accuracy of 10-Gbps Ethernet at the Interface Set Level
Range of Interface Set Shaper	Step Granularity
Up to 128 Mbps	500 Kbps
128 Mbps to 512 Mbps	2 Mbps
512 Mbps to 2.048 Gbps	8 Mbps
2.048 Gbps to 10 Gbps	128 Mbps

Table 5 shows the accuracy of the physical port shaper at various rates for Ethernet ports operating at 1 Gbps.

Table 5: Shaper Accuracy of 1-Gbps Ethernet at the Physical Port Level
Range of Physical Port Shaper	Step Granularity
Up to 64 Mbps	250 Kbps
64 Mbps to 256 Mbps	1 Mbps
256 Mbps to 1 Gbps	4 Mbps

Table 6 shows the accuracy of the physical port shaper at various rates for Ethernet ports operating at 10 Gbps.

Table 6: Shaper Accuracy of 10-Gbps Ethernet at the Physical Port Level
Range of Physical Port Shaper	Step Granularity
Up to 640 Mbps	2.5 Mbps
640 Mbps to 2.56 Gbps	10 Mbps
2.56 Gbps to 10 Gbps	40 Mbps