From: Marvin Greenlee (mgreenlee@ipexpert.com)
Date: Fri Aug 10 2007 - 12:15:06 ART
Double check your binary.
224 with a mask of 14 will match evens from 224 to 238.
224 with a mask of 15 will match 224 to 239.
In order to match evens / odds, the ones bit of the mask needs to be 0, as a
bit that you care about. Whether you are matching evens or odds is
determined by the address in the host/network portion of the ACL. If the
host portion is even (like 224), then evens are matched. If the host
portion is odd (like 225), then odds are matched. For a binary block of 16
addresses, the mask to match all would be .15. The mask to match evens or
odds would be .14, the only difference being that the ones bit is set to 0,
and the other bits can be anything in the range.
Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
Senior Technical Instructor - IPexpert, Inc.
A Cisco Learning Partner - We Accept Learning Credits!
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of tom
sun
Sent: Friday, August 10, 2007 2:47 AM
To: Marvin Greenlee
Cc: abderrahim sadki; ccielab@groupstudy.com
Subject: Re: IE lab8 task 5.2 - multicast rp to group mapping
hi greenlee
If you want to match odd first octets - 224.0.0.0 14.255.255.255
If you want to match even first octets - 224.0.0.0 15.255.255.255
On 8/9/07, Marvin Greenlee <mgreenlee@ipexpert.com> wrote:
>
> The multicast range is 224 to 239, not 224 to 255
>
> If you want to match odd first octets - 225.0.0.0 14.255.255.255
> If you want to match even first octets - 224.0.0.0 14.255.255.255
>
> Depending on what you're doing with the access list, it may or may not
> perform as you would like it to, especially when dealing with
> multicast. I
> don't have that particular WB, so I can't say what the section in
> particular
> is looking for.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> abderrahim sadki
> Sent: Thursday, August 09, 2007 2:30 PM
> To: ccielab@groupstudy.com
> Subject: RE: IE lab8 task 5.2 - multicast rp to group mapping
>
> sorry wrong wmask
> should have wrttien
>
> 30.255.255.255> From: a_sadki1@hotmail.com> To: ccielab@groupstudy.com>
> Subject: IE lab8 task 5.2 - multicast rp to group mapping> Date: Thu, 9
> Aug
> 2007 16:28:56 +0000> > Hi,> > Lab8 task 5.2> > The solution gives in the
> access-list the even and odd groups one of the> after.> > Instead of this
> can
> I group the even groups in one access-list and the odd> groups in another
> like
> that?> access-list 11 permit 224.0.0.0 30.0.0.0 // even multicast
> groupsaccess-list> 22 permit 225.0.0.0 30.0.0.0 // odd multicast groups> >
> Is
> this ok?> > Thanks,Abderrahim>
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