配套网卡DCQCN拥塞控制，交换机需要配置ECN水线。配置ECN水线属于交换机通用配置，本节是按Huarong FM8861交换机为例进行介绍。
配置参考
- 配置pfc和ecn。
port link-type trunk
port trunk allow-pass vlan 100 200
qos buffer queue 0 shared-threshold dynamic 10
qos buffer queue 1 shared-threshold dynamic 10
qos buffer queue 2 shared-threshold dynamic 10
qos buffer queue 3 shared-threshold dynamic 10
qos queue 0 wred 100g
qos queue 1 wred 100g
qos queue 2 wred 100g
qos queue 3 wred 100g
qos drr 0 to 3
qos queue 0 drr weight 25
qos queue 1 drr weight 25
qos queue 2 drr weight 25
qos queue 3 drr weight 25
qos queue 0 ecn
qos queue 1 ecn
qos queue 2 ecn
qos queue 3 ecn
dcb pfc enable mode manual
dcb pfc buffer 0 xoff static 500 cells xon offset 250 cells hdrm 2000 cells
dcb pfc buffer 1 xoff static 500 cells xon offset 250 cells hdrm 2000 cells
dcb pfc buffer 2 xoff static 500 cells xon offset 250 cells hdrm 2000 cells
dcb pfc buffer 3 xoff static 500 cells xon offset 250 cells hdrm 2000 cells
- 配置丢弃模板。
color green buffer-size low-limit 100000 high-limit 18874080 discard-percentage 30
- 配置优先级。
[~Switch]dcb pfc default
[~Switch-dcb-pfc-default]dis this
dcb pfc
priority 0 to 3
