Re: IP Prefix-List question

Agree with that. This is a good time to ask the proctor. Show him that you
understand the question show both options and what requirements of the task
both options will fullfill.

Kind regards,

Maarten Vervoorn
CCIE#27144
2012/4/3 Calin Chiorean <calin_at_engineer.com>

> Hello Maarten,
>
> Thanks!
>
> What confuse me is that no solution seems to be 100% true.
> - if I go with my one line prefix-list solution, than the request with
> minimum number of prefix-list is totally fulfilled , but I'm not that
> specific in regard to subnets
> - if I go with the proposed solution or with yours, then I'm more
> specific in regards to subnets matching, but I have more lines in the
> prefix-list
>
> It's not a task that I would call it hard to solve, rather a grey area one.
>
> Calin
>
> On 04/03/2012 10:14 AM, Maarten Vervoorn wrote:
> > Hi Calin,
> >
> > The first one has the least prefix-list lines. The second one in the
> answer
> > is a bit strange because it starts with 23 and thwere are no prefixes
> with
> > 23 or 24.
> > ip prefix-list ONE seq 5 permit 10.4.0.0/22 ge 23 le 30
> > ip prefix-list ONE seq 10 permit 10.4.4.0/22 ge 23 le 28
> > For the prefix 10.4.0.0/22 only 23 - 30 prefix lengts are allowed. 23 -
> > 28 is not needed if I look at the prefixes. Also 23-25 and 28 is not
> needed
> > in the second line
> >
> > in 10.4.0.0/21 ge25 le 30, prefixes 28, 29 and 30 are also allowed in
> the
> > 10.4.4.0/22 part and 25 - 27 are allow from the 10.4.0.0/22 part
> > But if it comes to prefixes I think I would expect a answer with a prefix
> > list as below
> > ip prefix-list ONE seq 5 10.4.0.0/22 ge 28 le 30
> > ip prefix-list ONE seq 10 10.4.4.0/22 ge 25 le 27
> >
> > Kind regards,
> >
> > Maarten Vervoorn
> > CCIE#27144
> >
> >
> >
> > 2012/4/3 Calin Chiorean <calin_at_engineer.com>
> >
> >> Hello Nitin,
> >>
> >> I think I was pretty clear in my e-mail:
> >>
> >> "I have a task in a preparation Lab for CCIE RS"
> >>
> >> Preparation Lab = workbook, mock lab, etc; this is what I understand
> >> from my phrase.
> >>
> >> This is not a task from the actual lab. Since I did not sit yet for the
> >> latest version (v4 I believe) of the lab, it4s pretty hard to guess the
> >> tasks :)
> >>
> >> Cheers,
> >> Calin
> >>
> >> On 04/03/2012 05:47 AM, nitin shettigar wrote:
> >>> Hi Calin,
> >>>
> >>> The Cisco NDA policy restricts one to discuss any thing which is
> related
> >>> directly to the LAB examination. Hope the Cisco guys don't come running
> >>> after you and debar you from the cisco community for life-time.
> >>>
> >>> regards,
> >>>
> >>> Nitin
> >>>
> >>> On Tue, Apr 3, 2012 at 12:59 AM, Calin Chiorean <calin_at_engineer.com
> >>> <mailto:calin_at_engineer.com>> wrote:
> >>>
> >>> Hello,
> >>>
> >>> I have a task in a preparation Lab for CCIE RS and I would like
> your
> >>> opinion on this.
> >>>
> >>> I have a number of subnets from which the followings are important
> >> for
> >>> this task:
> >>>
> >>> 10.4.1.4/30 <http://10.4.1.4/30>
> >>> 10.4.2.8/29 <http://10.4.2.8/29>
> >>> 10.4.3.16/28 <http://10.4.3.16/28>
> >>> 10.4.4.32/27 <http://10.4.4.32/27>
> >>> 10.4.5.64/26 <http://10.4.5.64/26>
> >>> 10.4.6.128/25 <http://10.4.6.128/25>
> >>>
> >>> The other present subnets are something like 10.7.x.x
> >>>
> >>> The request is to configure a prefix-list with base on:
> >>> - allow all subnets in 10.4.0.0
> >>> - as specific as possible, I should not allow other prefixes
> >>> - minimum number of prefix-lists
> >>>
> >>> Considering the above one I did
> >>> ip prefix-list ONE permit 10.4.0.0/21 <http://10.4.0.0/21> ge 25
> le
> >> 30
> >>>
> >>> However the proposed solution is:
> >>> ip prefix-list ONE seq 5 permit 10.4.0.0/22 <http://10.4.0.0/22>
> ge
> >>> 23 le 30
> >>> ip prefix-list ONE seq 10 permit 10.4.4.0/22 <http://10.4.4.0/22>
> ge
> >> > 23 le 28
> >>>
> >>> Both solutions are working, nevertheless which one would you choose
> >> in
> >>> an exam?
> >>>
> >>> Thanks and cheers,
> >>> Calin
> >>>
> >>>
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> >>>
> >>>
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Received on Tue Apr 03 2012 - 09:45:39 ART