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Excess Bandwidth Sharing and Minimum Logical Interface Shaping

The default excess bandwidth sharing proportional rate is 32.65 Mbps (128 kbps x 255). In order to have better weighed fair queuing (WFQ) accuracy among queues, the shaping rate configured should be larger than the excess bandwidth sharing proportional rate. Some examples are shown in Table 61.

Table 61: Shaping Rates and WFQ Weights

Shaping Rate	Configured Queue Transmit Rate	WFQ Weight	Total Weights
10 Mbps	(30, 40, 25, 5)	(22, 30, 20, 4)	76
33 Mbps	(30, 40, 25, 5)	(76, 104, 64, 13)	257
40 Mbps	(30, 40, 25, 5)	(76, 104.64, 13)	257

With a 10-Mbps shaping rate, the total weights are 76. This is divided among the four queues according to the configured transmit rate. Note that when the shaping rate is larger than the excess bandwidth sharing proportional rate of 32.65 Mbps, the total weights on the logical interface are 257 and the WFQ accuracy will be the same.

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