From: David Porta (David.Porta003@msd.govt.nz)
Date: Mon Nov 17 2003 - 23:18:02 GMT-3
Silvio and Jonathan,
As Jonathan mentioned, we need to be very careful on how we read the
questions and in my case I think I was too hasty on my answer. Please let
me elaborate.
Here is what I understand about your question Silvio:
1) The class "class-default" (all in lower case) is a well-known class:
!
R100(config)#class-map class-default
class-default is a well-known class and is not configurable under class-map
!
All traffic that is not classified, will belong to this class.
This traffic will receive best effort treatment by default. However, you
can configure different treatment using a policy-map statement, for example:
!
R100(config)#policy-map UNCLASSIFIED-TRAFFIC
R100(config-pmap)#class class-default
R100(config-pmap-c)#bandwidth percent 50
R100(config-pmap-c)#queue-limit 100
!
2) The class named "CLASS-DEFAULT" (all in upper case) is not the same as
class "class-default". It is a different class but with the same name.
In the example you e-mailed, say you had an ACL which allowed / filtered
only your TCP and FTP traffic.
You could use the following configuration using this class:
!
R100(config)#class-map CLASS-DEFAULT
R100(config-cmap)#match not access-group 100
!
This would classify all traffic that is not TCP or FTP into the class
CLASS-DEFAULT.
!
R100(config)#policy-map NON-TCP-FTP-TRAFFIC
R100(config-pmap)#class CLASS-DEFAULT
R100(config-pmap-c)#bandwidth percent 50
R100(config-pmap-c)#queue-limit 100
!
Maybe the following document will explain things better for you.
http://www.cisco.com/en/US/customer/products/sw/iosswrel/ps5014/products_feature_guide_chapter09186a008008813a.html#19860
Silvio, please let me know if this is a bit more clear.
If you guys see a problem here, please let us know.
Thanks Jonathan for your help.
Cheers,
David
Jonathan V Hays wrote:
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> >Behalf Of David Porta
> >Sent: Monday, November 17, 2003 7:18 PM
> >To: Silvio Nunes
> >Cc: ccielab@groupstudy.com
> >Subject: Re: CBWFQ - Class-Default
> >
> >
> >Hi Silvio,
> >
> >I believe you still have to create the class "CLASS-DEFAULT"
> >before you assign
> >it to the policy map.
> >ie:
> >
> >!
> >class CLASS-DEFAULT
> > match cos 1
> >!
>
> First, the class "CLASS-DEFAULT" is *not* the same class as
> "class-default". These labels are case-sensitive. See below.
>
> R2#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> R2(config)#class
> R2(config)#class-map TEST
> R2(config-cmap)#match any
> R2(config-cmap)#class-map test
> R2(config-cmap)#match any
> R2(config-cmap)#end
> R2#sh run | include class-map
> class-map match-all TEST
> class-map match-all test
> R2#
>
> Second, you do *not* have to create the class "class-default."
>
> R2(config)#policy jonathan
> R2(config-pmap)#class ?
> WORD class-map name
> class-default System default class matching otherwise unclassified
> packets
>
> R2(config-pmap)#class
>
> Also, see
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
> fqos_c/fqcprt7/qcfipatm.htm#18050
>
> "Therefore, to configure per-VC WFQ, you must first create a policy map
> and configure the class-default class. (You need not create the
> class-default class, which is predefined, but you must configure it.)"
>
> http://www.cisco.com/univercd/cc/td/doc/product/aggr/10000/config/qos/ov
> rvu.htm#1070365
>
> "Class-Default Class
>
> The class named class-default is a traffic class that the router uses to
> classify traffic when no other traffic class is defined. You cannot
> modify the class-default class."
>
> So all you need to do is configure the class-default class in your
> policy map, if so desired.
>
> HTH,
>
> Jonathan
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