Re: IP Prefix-List question

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
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
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Received on Tue Apr 03 2012 - 09:14:42 ART