From: Marvin Greenlee (mgreenlee@ipexpert.com)
Date: Fri Aug 10 2007 - 15:44:31 ART
For your second example, I'm guessing you meant 1.0.0.0 with a mask of
254.255.255.255 for matching odd first octet.
In general, it's best to be granular.
With regards to what is "sent" it's best to look at the router directly and
see what happens. It DOES matter what you send.
The access-list in the "send-rp-announce" is passed to the mapping agent
line by line. If the mapping agent were filtering certain groups, the
filter on the mapping agent may block the announcement. Look at the output
of "debug ip pim auto-rp" on the mapping agent, and you can see the
individual lines either updating or being filtered.
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: Gregory Gombas [mailto:ggombas@gmail.com]
Sent: Friday, August 10, 2007 1:30 PM
To: Marvin Greenlee
Cc: tom sun; ccielab@groupstudy.com
Subject: Re: IE lab8 task 5.2 - multicast rp to group mapping
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.
> A Cisco Learning Partner - We Accept Learning Credits!
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: mgreenlee@ipexpert.com
>
> IPexpert - The Global Leader in Self-Study, Classroom-Based, Video
> Class-On-Demand and Audio Certification Training Tools for the Cisco CCIE
> R&S Lab, CCIE Security Lab, CCIE Service Provider Lab, CCIE Voice Lab and
> CCIE Storage Lab Certifications.
> -----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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