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This role sets up SQM QoS traffic shaping, in Luci found at Network- SQM QoS.
For detailed documentation about this feature see OpenWrt SQM docs.
A minimalistic configuration could look like this, on a VDSL2 100/40 Mbps line.
openwrt_sqm_interfaces:
pppoe:
interface: "pppoe-wan"
linklayer: "ethernet"
overhead: 34
upload: 35000
download: 90000
Multiple instances of sqm interfaces can be defined using this dictionary variable.
Attention
The interface name (here: pppoe) may not contain a hyphen. I cannot say what other characters are disallowed, too. Ideally don't use special characters, just alphanumeric.