From: John Conzone (jkconzone@xxxxxxxx)
Date: Sun Aug 27 2000 - 20:52:26 GMT-3
Guys, someone help me out. I'm all right with class b, class c, and even
and odd. But the mask thing is confusing me.
How do you filter a mask in an bgp update? Source of the route okay, the
destination the route points to okay, but the mask?
I don't get it and its pissing me off!
----- Original Message -----
From: "Kent" <cciecn@yahoo.com>
To: "Aaron DuShey" <aaron.dushey@dushey-consulting.com>; "'Simon Baxter'"
<Simon.Baxter@au.logical.com>; "'CCIE Group Study (E-mail)'"
<ccielab@groupstudy.com>
Sent: Sunday, August 27, 2000 7:20 PM
Subject: RE: An access-list challenge
> Mine looks like this:
>
> 101 deny ip 128.0.0.0 63.254.255.255 0.0.0.0
> 255.254.0.0
>
> 101 deny ip 192.0.1.0 31.255.254.255 255.255.255.128
> 0.0.0.127
>
> 101 permit any
>
> I assume that 135.120.0.0 is a even class B and
> 192.168.1.0 is odd class C.
>
> Thanks
>
> Kent
>
> --- Aaron DuShey <aaron.dushey@dushey-consulting.com>
> wrote:
> > access-list 101 deny ip 129.0.0.0 0.254.255.255
> > host 255.255.0.0
> > access-list 101 deny ip 192.168.1.0 0.0.254.255
> > host 255.255.255.0
> >
> > 1st statement-Deny even numbered class B matching
> > last bit in 2nd octet as
> > even-host 255.255.0.0 matches class B
> > 2nd statement-Deny odd(1) numbers class c(host
> > 255.255.255.0)
> >
> > Yes no?
> > good challenge
> >
> > Aaron DuShey
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com]On Behalf Of
> > Simon Baxter
> > Sent: Saturday, August 26, 2000 5:51 PM
> > To: CCIE Group Study (E-mail)
> > Subject: An access-list challenge
> >
> >
> > For anybody up to it..
> >
> > not too nasty..
> >
> > RTRA
> > router bgp 100
> > distribute-list 101 in
> >
> >
> > create access-list 101 so that RTRA doesn't accept
> > even numbered class B
> > routes with a mask <16 bits or odd numbered class C
> > routes with a mask >24
> > bits.
> >
> >
> >
> > I hope it didn't take you as long as it did me!!
> >
> >
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