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The same problem on Gentoo
change
RATE_NOW=`tc class show dev $DEVICE| sed -n \
"/cbq 1:$CLASS / { s/.*rate //; s/ .*//; p; q; }"`

to
RATE_NOW=`tc class show dev $DEVICE parent 1:$CLASS| sed -n \
"/cbq 1:$CLASS / { s/.*rate //; s/ .*//; p; q; }"`