From: Gregory Gombas (ggombas@gmail.com)
Date: Fri Aug 10 2007 - 14:29:38 ART
How about just:
224.0.0.0 with mask 254.255.255.255 - EVEN
225.0.0.0 with mask 254.255.255.255 - ODD
or just
0.0.0.0 with mask 254.255.255.255 - EVEN
0.0.0.1 with mask 254.255.255.255 - ODD
I mean its not like the RP will advertise non-multicast addresses
anyway - right?
On 8/10/07, Marvin Greenlee <mgreenlee@ipexpert.com> wrote:
> 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.
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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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