Re: Class "A" prefix-list

I like the 0.0.0.0/1 le 32 because it covers supernets/summaries also

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Regards,

Joe Astorino
CCIE #24347

"He not busy being born is busy dying" - Dylan

-----Original Message-----
From: Hammer cisco <cisco.iers_at_gmail.com>
Sender: nobody_at_groupstudy.com
Date: Wed, 1 Jun 2011 23:56:40
To: Tolulope Ogunsina<togunsina_at_gmail.com>
Reply-To: Hammer cisco <cisco.iers_at_gmail.com>
Cc: Daniel Kutchin<daniel_at_kutchin.com>; Cisco certification<ccielab_at_groupstudy.com>
Subject: Re: Class "A" prefix-list

thanks Tolu

so i think we can use 0.0.0.0/1 le 32 to be a general match for Class A
route whether it's a summary or not .

On 1 June 2011 23:54, Tolulope Ogunsina <togunsina_at_gmail.com> wrote:

> It depends on what you want to match.
>
> If you have a summary route e.g 16.0.0.0/6, then the prefix 0.0.0.0/1 ge 8
> wont match it but the prefix 0.0.0.0/1 le 32 would.
>
> HTH,
>
>
> On Wed, Jun 1, 2011 at 9:45 PM, Hammer cisco <cisco.iers_at_gmail.com> wrote:
>
>> thanks danel ,
>>
>> but still i need to know exactly what's the difference between 0.0.0.0/1ge
>> 8 and 0.0.0.0/1 le 32
>>
>> as i think all class A networks starting from mask 8 and greater , i have
>> not seen a network with mask less 8
>>
>> On 1 June 2011 23:35, Daniel Kutchin <daniel_at_kutchin.com> wrote:
>>
>> > If you just want to match Class A's with 8 bit masks, Class B's with 16
>> bit
>> > masks, and class C's with 24 bit masks.
>> >
>> > 0.0.0.0/1 ge 8 le 8
>> > 128.0.0.0/2 ge 16 le 16
>> > 192.0.0.0/3 ge 24 le 24
>> >
>> > If you want to match anything in the individual address spaces for class
>> > A,B, C
>> > 0.0.0.0/1 le 32
>> > 128.0.0.0/2 le 32
>> > 192.0.0.0/3 le 32
>> >
>> >
>> > Class A- binary first bit 0.
>> > Class B - binary first two bits 10.
>> > Class C - binary first three bits 110.
>> >
>> > -
>> > Daniel
>> >
>> >
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> > Hammer cisco
>> > Sent: Mittwoch, 1. Juni 2011 21:38
>> > To: ccielab_at_groupstudy.com
>> > Subject: Class "A" prefix-list
>> >
>> > Hi experts,
>> >
>> > i am a little bit confused about the exact prefix-list we can use to
>> match
>> > all class A network address routes :
>> >
>> > ip prefix-list 0.0.0.0/1 ge 8
>> >
>> > or
>> >
>> > ip prefix-list 0.0.0.0/1 le 32
>> >
>> >
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>> >
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>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Best Regards,
>
> Tolulope.

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Received on Wed Jun 01 2011 - 21:37:04 ART