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Configuration Guide - Low Latency Network

CloudEngine 8800, 7800, 6800, and 5800 V200R005C00

This document describes the configurations of Buffer optimization of lossless queues, Fast ECN, Fast CNP, Dynamic ECN threshold of lossless queues, and Dynamic load balancing.
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Configuring Fast ECN

Configuring Fast ECN



Only the CE8860EI, CE8850EI, CE6860EI, CE6865EI, CE6870EI, and CE6875EI support the function.

Fast ECN allows the device to tag the packet when the packet goes out of the queue. When a packet goes out of a queue, the device determines whether the buffer used by the queue exceeds the ECN threshold. If so, the packet is tagged with the ECN field (the ECN field in the packet is set to 11). The device then tags the packet with the ECN field and forwards the tagged packet. As the packet has already left the queue, the time for forwarding tagged packets in the queue is shortened. The destination server can receive the tagged packet with the least delay possible.


By default, the fast ECN function is provided at boot time. No command for enabling or disabling this function is provided.

Updated: 2019-04-20

Document ID: EDOC1100040243

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