S5720-28X-LI-24S-AC buffer size
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Hello, The qos queue max-buffer command sets the maximum number of bytes in all packets to be cached in a queue. The undo qos queue max-buffer command restores the default maximum number of bytes in all packets to be cached in a queue. The qos queue green max-buffer command sets the maximum number of bytes in green packets to be cached in a queue. The undo qos queue green max-buffer command restores the default maximum number of bytes in green packets to be cached in a queue. By default, the maximum buffer size of all packets in a queue is 24 and the maximum buffer size of green packets in a queue is 12, in cells. The size of a cell is 128 bytes.  Only the S2720-EI, S5720I-SI, S5720-LI, S5720S-LI, S5720S-SI, S5720-SI, S5730S-EI, S5730-SI, S6720-LI, S6720S-LI, S6720S-SI, and S6720-SI support this command. Formatqos queue queue-index max-buffer cell-number [ green max-buffer cell-number ] undo qos queue queue-index max-buffer [ cell-number green max-buffer cell-number | green max-buffer ] qos queue queue-index green max-buffer cell-number undo qos queue queue-index green max-buffer Parameters
Usage GuidelinesUsage Scenario When congestion occurs, the switch uses the tail drop method. When the queue length reaches the upper limit, excess packets (buffered at the queue tail) are discarded until congestion is removed. You can run the qos queue max-buffer command to set the maximum number of bytes in all packets or green packets to be cached in a queue so that the queue has sufficient buffer, preventing packet loss. Prerequisites A tail drop profile has been created using the qos tail-drop-profile (system view) command. Precautions You can also use the qos queue max-length command to set the maximum number of packets to be cached in a queue. If the maximum number of bytes or packets is reached, the device considers that congestion occurs and will discard subsequent packets. Example# Create a global tail drop profile named test, and then set the maximum buffer size of all packets in a BE queue for the global tail drop profile to 100, in cells. <HUAWEI> system-view[HUAWEI] qos tail-drop-profile test[HUAWEI-tail-drop-profile-test] qos queue 0 max-buffer 100 Thanks | |||||||||||||||
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