[LARTC] How to change HTB default value?

[권우식 <openings@xxxxxxxxxxxxxxxxx>]

Hi.

 

I want to change HTB qdisc's default setting to 20.

 

but, i cannot change it.

 

# tc qdisc change dev eth0 root handle 1: htb default 20
RTNETLINK answers: Invalid argument

 

I can add qdisc and del qdisc. but can't change qdisc setting.

 

For class, I can add, del, change all setting.

 

How to change HTB qdisc's default value?