Configuration basics

We start at the root of the device, ppp0:

 # tc qdisc add dev ppp0 root      \ 
   handle 1: htb 

Installs HTB as the root qdisc, names it 1:0.

 # tc qdisc add dev ppp0 parent 1: \ 
   classid 1:1 htb rate 100kbps    \ 
   burst 2k

This attaches a shaping HTB to the HTB root, 100kbps with a 2k bucket.