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Example: Configuring Transmit Rates That Add Up to More Than 100 Percent

In the following example, ef is an expedited forwarding traffic queue; nc is a network control traffic queue; af_01, af_02, af_03, and af_04 are assured forwarding traffic queues; and be is a best effort forwarding queue. so-2/2/0 unit 0 is the logical interface.

The ef and the nc queues are at the same priority. Therefore, both these queues take precedence over all the other queues. The ef queue consumes 100 Mbps (50 percent of the CIR; that is, 50 percent of 200 Mpbs) bandwidth. The remaining 200 Mbps is rate limited. The nc queue continues to consume the bandwidth till the logical interface reaches its CIR of 200 Mbps. Therefore, the nc queue gets 100 Mbps bandwidth. When the logical interface reaches its CIR, all queues transition into the excess region and the scheduler allocates the remaining bandwidth to the non-expedited forwarding queues based on their default excess priorities and default excess rates (same as the transmit rates).

As per Table 1, all the non-strict-high queues are in the same excess priority (in this case, low priority), these non-strict-high queues get the bandwidth out of the remaining 100 Mbps in the ratio of 5:20:35:30:9:1 until the logical interface consumes its shaping rate of 300 Mbps. Thus, the non-strict-high queues add up to 100 percent of bandwidth utilization to optimize the bandwidth usage.