[LARTC] tncg and bandwidth limiting

[Scott Baker]

I'm trying to do some very simple rate-shaping on an interface. I want to 
limit my 100baseT interface to 7 megs both ingress and egress of the 
interface. I've been hacking my way through the documentation and some 
examples and I've come up with the following configuration for tcng that 
seems to do what I want.

I'm curious if some of the other experts out there wouldn't have a "better" 
way to do what I'm doing. I'd like to do HTB ingress as well, but it 
complains that the the ingress qdisc doesn't allow inside classes or 
something like that. I think this will work for me, I just want to make 
sure this is the best way to do things.

----------------------------

dev INTERFACE {
   egress {
      class ( <$all> ) if 1;

      htb () {
        class ( rate 100Mbps, ceil 100Mbps ) ;
        $all = class ( rate 7Mbps, ceil 7Mbps ) ;
      }
      $o = bucket(rate 7Mbps, burst 200kB, mpu 200B);
      class (2) if (conform $o && count $o) || drop;
   }
}

/*  tcng syntax         English equivalent         tc syntax
    -----------         --------------------       ---------
       bps              bits per second               bit
       Bps              bytes per second              bps (!)
       kbps             kilobits per second           kbit
       kBps             kilobytes per second          kbps
       Mbps             megabits per second           ???
*/
Scott Baker - Network Engineer - RHCE
bakers @ web-ster . com - 503.266.8253 

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