From: Kaiser Anwar (kaiseranwar@sbcglobal.net)
Date: Thu Jan 08 2004 - 22:58:47 GMT-3
Thanks again I just tested it with rip its working fine. Thanks
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "'Kaiser Anwar'" <kaiseranwar@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Thursday, January 08, 2004 7:52 PM
Subject: RE: classfull routes with an access list
> Yes you can. The class of an address is determined by the first
> four most significant bits:
>
> Class A: 0xxxxxxx
> Class B: 10xxxxxx
> Class C: 110xxxxx
> Class D: 1110xxxx
> Class E: 1111xxxx
>
> So if you want to match on just the class, you can do it with a
> standard access-list.
>
> Access-list 1 permit 0.0.0.0 127.255.255.255 <-- Class A
> Access-list 1 permit 128.0.0.0 63.255.255.255 <-- Class B
> Access-list 1 permit 192.0.0.0 31.255.255.255 <-- Class C
>
> If you want to match classful networks with classful masks (i.e.
> class A with /8, class B with /16, and class C with /24), you need an
> extended access-list or an ip prefix-list.
>
> Simply take the above syntax and add the mask as the destination:
>
> Class A:
> Access-list 100 permit ip 0.0.0.0 127.255.255.255 host 255.0.0.0
>
> Class B:
> Access-list 100 permit ip 128.0.0.0 63.255.255.255 host 255.255.0.0
>
> Class C:
> Access-list 100 permit ip 192.0.0.0 31.255.255.255 host 255.255.255.0
>
> Note that this extended ACL syntax can only be applied in BGP.
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 708-362-1418 (Outside the US and Canada)
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Kaiser Anwar
> > Sent: Thursday, January 08, 2004 7:38 PM
> > To: ccielab@groupstudy.com
> > Subject: classfull routes with an access list
> >
> > Hi,
> > I was wondering that would it be possible to permit or block classfull
> > routes
> > with access-list.I know it is done with prefix list.
> >
> > Thanks
> >
> >
> > Sincerely,
> > Kaiser Anwar
> > (847) 409-7261
> > CCNA, CCNP
> > CCSA, MCSE
> >
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