RE: class-map match

Right.
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Narbik Kocharians
> Sent: Wednesday, January 20, 2010 12:48 PM
> To: Carlos G Mendioroz
> Cc: ALL From_NJ; Mad_Prof Mad_Prof; estela Mathew; Joe Astorino; Ed
> Man; GS
> Subject: Re: class-map match
>
> Have a look at the logic and it will make perfect sense:
>
>
>
> In the following example, you are matching packets that are marked with
> IPP
> 4 AND match access-list 100, so the logic says, in order for me to have
> a
> classification, the packet has to match to what ever I have defined in
> the
> access-list AND it has to also be marked with IPP4 (since you used
> *ip*precedence, it has to be an IPv4 packet as well)
>
>
> > Agreed,
> > but they are different, and the difference will be obvious when
> > you later on decide to add another line to the class.
> >
> > So far, I would expect them to behave almost the same, one will have
> > more granular counters in show policy though ?
> >
> > -Carlos
> >

I still agree with Carlos though, that the combined OR statement vs a listed OR has benefits of both adding more configuration later and the policy map counters:

Rack1R1(config-pmap-c)#do show run | s class-map|policy-map
class-map match-any DSCP-26-24
 match dscp af31
 match dscp cs3
class-map match-all DSCP-26-24-oneline
 match dscp cs3 af31
policy-map classify-in
 class DSCP-26-24
 class DSCP-26-24-oneline

Rack1R1(config-pmap-c)#do show policy-map int
 Serial0/2/0

  Service-policy input: classify-in

    Class-map: DSCP-26-24 (match-any)
      0 packets, 0 bytes
      5 minute offered rate 0 bps
      Match: dscp af31 (26)
        0 packets, 0 bytes
        5 minute rate 0 bps
      Match: dscp cs3 (24)
        0 packets, 0 bytes
        5 minute rate 0 bps

    Class-map: DSCP-26-24-oneline (match-all)
      0 packets, 0 bytes
      5 minute offered rate 0 bps
      Match: dscp cs3 (24) af31 (26)

    Class-map: class-default (match-any)
      11 packets, 868 bytes
      5 minute offered rate 0 bps, drop rate 0 bps
      Match: any

It might do the same thing, but you might miss a big part of the picture.

-ryan

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Received on Wed Jan 20 2010 - 18:05:29 ART