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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