配置ECN后导致丢包

客户配置ECN后出现队列1 2 3 丢包

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qos wred queue table wred

queue 4 drop-level 0 low-limit 80 high-limit 516 discard-probability 100

queue 4 drop-level 1 low-limit 80 high-limit 516 discard-probability 100

queue 4 drop-level 2 low-limit 80 high-limit 516 discard-probability 100

queue 4 ecn

queue 5 drop-level 0 low-limit 1000 high-limit 5000 discard-probability 20

queue 5 drop-level 1 low-limit 1000 high-limit 5000 discard-probability 20

queue 5 drop-level 2 low-limit 1000 high-limit 5000 discard-probability 20

queue 5 ecn

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其他队列丢包是因为它们应用了 WRED 表的缺省参数（下限 100，上限 1000，丢弃概率 10%），而又没有开启ECN，导致了wred丢包

调高对应队列的水线，避免wred丢包

qos wred queue table 100G-WRED-Template

queue 0 drop-level 0 low-limit 3500 high-limit 20000 discard-probability 20

queue 0 drop-level 1 low-limit 3500 high-limit 20000 discard-probability 20

queue 0 drop-level 2 low-limit 3500 high-limit 20000 discard-probability 20       

queue 1 drop-level 0 low-limit 3500 high-limit 20000 discard-probability 20

queue 1 drop-level 1 low-limit 3500 high-limit 20000 discard-probability 20

queue 1 drop-level 2 low-limit 3500 high-limit 20000 discard-probability 20

queue 2 drop-level 0 low-limit 3500 high-limit 20000 discard-probability 20

queue 2 drop-level 1 low-limit 3500 high-limit 20000 discard-probability 20

queue 2 drop-level 2 low-limit 3500 high-limit 20000 discard-probability 20

queue 3 drop-level 0 low-limit 3500 high-limit 20000 discard-probability 20

queue 3 drop-level 1 low-limit 3500 high-limit 20000 discard-probability 20

queue 3 drop-level 2 low-limit 3500 high-limit 20000 discard-probability 20

queue 4 drop-level 0 low-limit 1000 high-limit 2000 discard-probability 20

queue 4 drop-level 1 low-limit 1000 high-limit 2000 discard-probability 20

queue 4 drop-level 2 low-limit 1000 high-limit 2000 discard-probability 20

queue 5 drop-level 0 low-limit 1000 high-limit 2000 discard-probability 20

queue 5 drop-level 1 low-limit 1000 high-limit 2000 discard-probability 20

queue 5 drop-level 2 low-limit 1000 high-limit 2000 discard-probability 20

queue 6 drop-level 0 low-limit 3500 high-limit 20000 discard-probability 20

queue 6 drop-level 1 low-limit 3500 high-limit 20000 discard-probability 20

queue 6 drop-level 2 low-limit 3500 high-limit 20000 discard-probability 20

queue 7 drop-level 0 low-limit 37999 high-limit 38000 discard-probability 20

queue 7 drop-level 1 low-limit 37999 high-limit 38000 discard-probability 20

queue 7 drop-level 2 low-limit 37999 high-limit 38000 discard-probability 20  

queue 4 ecn

queue 5 ecn