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)

*Class-map TST *

* Match ip precedence 4*

* Match access-group 100*

In the following example, you are saying as long as the packet matches one
of the following I have a classification. So the logic here is OR, it should
match ACL 100 OR have a marking of IPP4.

*Class-map match-any TST *

* Match ip precedence 4*

* Match access-group 100*

In the following example, you are saying that I like to have a
classification if the packet is marked with DSCP 31 OR 41, note the logic is
correct, because as long as the packet is marked with DSCP value of 31 or 41
you will have a classification.

*Class-map match-any TST*

* Match dscp 31*

* Match dscp 41*

In the following example, the two match statements that you have configured
will use an AND logic regardless of how the matches were configured; But
since you have NOT specified the logic (match-all or match-any), it defaults
to match-all, and because of that, the logic is incorrect, because a packet
can NOT have two different dscp values, I doubt that you will match anything
here.

*Class-map TST*

*Match dscp 31*

* Match dscp 41*

Now this is the correct way of configuring the above example, because you
are saying if the packet is marked with a dscp value of 31 OR 41, i want to
classify it.

*Class-map Match-any TST*

* Match dscp 31*

* Match dscp 41*

And if you do a show run after you configure the above example, the IOS will
display it the proper way:

*Class-map Match-any TST*

* Match dscp 31 41*

On Wed, Jan 20, 2010 at 9:16 AM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> 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
>
> ALL From_NJ @ 19/01/2010 11:23 -0300 dixit:
> > This is worth a quick look up to those who said it would not match
> > anything. Multiple DSCP values on a single command line are allowed ...
> > Also, this is worth labbing up. Look at the show running command with
> > separate match statements and then try again with a single match
> statement.
> >
> >
> > (say this with a pirate accent) "Aye mately, tis worth a quick glace says
> > I. Keep yer weather eye and yer wont be caught unawares ... "
> >
> >
> http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_m1.html#wp1034334
> >
> > Practice your doc cd lookup skills as well as see the command usage /
> usage
> > guidelines. ;-)
> >
> > HTH,
> >
> > Andrew
> >
> >
> > On Tue, Jan 19, 2010 at 8:27 AM, Mad_Prof Mad_Prof <dr3d3m3nt0_at_gmail.com
> >wrote:
> >
> >> class-map match-all TRANSACTIONAL_DATA
> >> match ip dscp af21 af22 af23
> >>
> >> I expect no matches for this class-map.
> >>
> >>
> >> Thanks
> >>
> >>
> >> On Tue, Jan 19, 2010 at 3:14 AM, estela Mathew <estelamathew_at_gmail.com
> >>> wrote:
> >>> Dear's
> >>>
> >>> Its different the upper statement shld match everything and the lower
> >>> statement matches any 1 of that and takes action.
> >>>
> >>> Thanks,
> >>>
> >>>
> >>> On Tue, Jan 19, 2010 at 11:51 AM, Joe Astorino <jastorino_at_ipexpert.com
> >>>> wrote:
> >>>> I agree with Narbik,these look functionally the same. BUT I would
> >>>> test it : ) We've all seen the AND/OR logic in a route-map do
> >>>> stranger things.
> >>>>
> >>>> On Tue, Jan 19, 2010 at 2:44 AM, Narbik Kocharians <narbikk_at_gmail.com
> >
> >>>> wrote:
> >>>>> They look the same to me.
> >>>>>
> >>>>> On Mon, Jan 18, 2010 at 10:54 PM, Ed Man <networkexpert08_at_gmail.com>
> >>>> wrote:
> >>>>>> Hi Group,
> >>>>>>
> >>>>>> Are they essentially the same? Or they are different?
> >>>>>>
> >>>>>> class-map match-all TRANSACTIONAL_DATA
> >>>>>> match ip dscp af21 af22 af23
> >>>>>>
> >>>>>> class-map match-any T_D
> >>>>>> match ip dscp af21
> >>>>>> match ip dscp af22
> >>>>>> match ip dscp af23
> >>>>>>
> >>>>>> Thanks
> >>>>>> Ed.
> >>>>>>
> >>>>>>
> >>>>>> Blogs and organic groups at http://www.ccie.net
> >>>>>>
> >>>>>>
> >>> _______________________________________________________________________
> >>>>>> Subscription information may be found at:
> >>>>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>
> >>>>> --
> >>>>> Narbik Kocharians
> >>>>> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> >>>>> www.MicronicsTraining.com <http://www.micronicstraining.com/>
> >>>>> Sr. Technical Instructor
> >>>>> YES! We take Cisco Learning Credits!
> >>>>> Training And Remote Racks available
> >>>>>
> >>>>>
> >>>>> Blogs and organic groups at http://www.ccie.net
> >>>>>
> >>>>>
> >> _______________________________________________________________________
> >>>>> Subscription information may be found at:
> >>>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>> --
> >>>> Regards,
> >>>>
> >>>> Joe Astorino CCIE #24347 (R&S)
> >>>> Sr. Technical Instructor - IPexpert
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> _______________________________________________________________________
> >>>> Subscription information may be found at:
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> >>>
> >>> Blogs and organic groups at http://www.ccie.net
> >>>
> >>> _______________________________________________________________________
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> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >> --
> >> It is said that if you know your enemies and know yourself, you will not
> be
> >> imperiled in a hundred battles; if you do not know your enemies but do
> know
> >> yourself, you will win one and lose one; if you do not know your enemies
> >> nor
> >> yourself, you will be imperiled in every single battle.
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
YES! We take Cisco Learning Credits!
Training And Remote Racks available
Blogs and organic groups at http://www.ccie.net