Re: hierarchical shaping versus shaping in conjunction to cbwfq

From: Pierre-Alex (paguanel@hotmail.com)
Date: Sat Jun 03 2006 - 17:26:56 ART

Its all clear now .

Thanks Petr and Chris for your help !!!

  ----- Original Message -----
  From: Chris Lewis
  To: Petr Lapukhov
  Cc: Pierre-Alex ; ccielab@groupstudy.com
  Sent: Saturday, June 03, 2006 8:54 PM
  Subject: Re: hierarchical shaping versus shaping in conjunction to cbwfq

  Pierre,

  It's a bit difficult to sift through all of the materila in your first post,
I think most of its already discussed. Just a comment on one issue though.
  Regards "Would Configuration 4 accomplish the same thing as
  configuration 3 ?"

  Configuration 3:
  ==========

  policy pop
     class main
        shape a
        service-policy toto

   policy toto
   class 1
      bandwidth y

   class 2
        bandwidth z

  ==========
  Configuration 4:
  ==========

  policy pop
     class main
        shape a

   class 1
      bandwidth y

   class 2
        bandwidth z

  Configuration 3 will shape the main interface to rate a, and bandwidth will
be applied to class 1 and 2 as configured. Configuration 4 will not achieve
the same thing. In a policy-map, the order of clas appearance is significant.
If class main matches all traffic, not traffic will ever fall dwon out of it
to be matched in class 1 or class 2, so the bandwidth configuration will not
have an effect for those classes.

  Chris

  On 6/3/06, Petr Lapukhov <petrsoft@gmail.com> wrote:
    As for subinterface example.

    Let's imagine that we have FastEthernet with two vlans: 10 and 20

    We want to limit sending rate to every VLAN up to 1Mbs, and provide
    some traffic reservation at the same time. Say give RTP priority, and
    guarantee HTTP 384Kb on every vlan.

    We can not directly put CBWFQ at subinterface - subinterface is never
    congested, hence queueing in never activated. So we need to come
    with a little bit more complicated idea.

    First, we create CBWFQ strategy:

    class-map VOICE
    match protocol rtp

    class-map HTTP
    match protocol http

    policy-map CBWFQ
    class VOICE
    priority 128
    class HTTP
    bandwith 384

    Now, we should shape ALL the subinterface traffic to 1Mbs:

    policy-map VLAN10_SHAPE
    class class-default
    shape average 1000000
    service-policy CBWFQ

    interface fastethernet 0/0.10
    encapsulation dot1q 10
    ip address 10.10.10.1 255.255.255.0
    service-policy output VLAN10_SHAPE

    So now we shape all VLAN10 traffic to 1Mbs, yet give some traffic
    priority treatment.

    HTH
    Petr

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