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           tc  qdisc  ... dev dev ( parent classid | root) [ handle major: ] htb [
           default minor-id ]
           tc class ... dev dev parent major:[minor] [ classid major:minor  ]  htb
           rate rate [ ceil rate ] burst bytes [ cburst bytes ] [ prio priority ]


           HTB is meant as a more understandable and intuitive replacement for the
           CBQ qdisc in Linux. Both CBQ and HTB help you to control the use of the
           outbound  bandwidth on a given link. Both allow you to use one physical
           link to simulate several slower links and to send  different  kinds  of
           traffic  on different simulated links. In both cases, you have to spec-
           ify how to divide the physical link into simulated  links  and  how  to
           decide which simulated link to use for a given packet to be sent.
           Unlike  CBQ,  HTB shapes traffic based on the Token Bucket Filter algo-
           rithm which does not depend on interface characteristics  and  so  does
           not need to know the underlying bandwidth of the outgoing interface.


           Shaping works as documented in tc-tbf (8).


           Within  the  one  HRB  instance  many  classes may exist. Each of these
           classes contains another qdisc, by default tc-pfifo(8).
           When enqueueing a packet, HTB starts at the root and uses various meth-
           ods to determine which class should receive the data.
           In the absence of uncommon configuration options, the process is rather
           easy.  At each node we look for an instruction,  and  then  go  to  the
           class  the  instruction  refers  us  to. If the class found is a barren
           leaf-node (without children), we enqueue the packet there. If it is not
           yet  a  leaf  node, we do the whole thing over again starting from that
           The following actions are performed, in order at each  node  we  visit,
           until one sends us to another node, or terminates the process.
           (i)    Consult filters attached to the class. If sent to a leafnode, we
                  are done.  Otherwise, restart.
           (ii)   If none of the above returned with an  instruction,  enqueue  at
                  this node.
           This  algorithm makes sure that a packet always ends up somewhere, even
           while you are busy building your configuration.
           handle major:
                  Like all other qdiscs, the HTB can be assigned a handle.  Should
                  consist  only  of a major number, followed by a colon. Optional,
                  but very useful if classes will be generated within this  qdisc.
           default minor-id
                  Unclassified  traffic gets sent to the class with this minor-id.


           Classes have a host of parameters to configure their operation.
           parent major:minor
                  Place of this class within the hierarchy. If  attached  directly
                  to  a  qdisc  and  not  to  another class, minor can be omitted.
           classid major:minor
                  Like qdiscs, classes can be named.  The  major  number  must  be
                  equal  to  the  major  number  of the qdisc to which it belongs.
                  Optional, but needed if this class is going to have children.
           prio priority
                  In the round-robin process, classes  with  the  lowest  priority
                  field are tried for packets first. Mandatory.
           rate rate
                  Maximum  rate  this  class  and all its children are guaranteed.
           ceil rate
                  Maximum rate at which a class can send, if its parent has  band-
                  width  to spare.  Defaults to the configured rate, which implies
                  no borrowing
           burst bytes
                  Amount of bytes that can be burst at ceil speed,  in  excess  of
                  the  configured rate.  Should be at least as high as the highest
                  burst of all children.
           cburst bytes
                  Amount of bytes that can be burst at 'infinite' speed, in  other
                  words,  as  fast as the interface can transmit them. For perfect
                  evening out, should be equal to  at  most  one  average  packet.
                  Should  be  at  least as high as the highest cburst of all chil-


           Martin  Devera  <>.  This manpage maintained by bert hubert

    iproute2 10 January 2002 HTB(8)


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