From: Scott Morris (swm@emanon.com)
Date: Tue Jul 20 2004 - 21:04:14 GMT-3
You can still do auto-rp with a sparse-only setup...
As long sa you are running 12.2(7) or later, the command is "ip pim autorp
listener"
Check out:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/123ti
p3r/ip3_i2gt.htm#wp1068637
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gerry Hilton
Sent: Tuesday, July 20, 2004 7:45 PM
To: Kenneth Wygand
Cc: ccielab@groupstudy.com
Subject: Re: Multicast - Sparse Mode
Hi. I agree - if it is clearly stated to configure sparse mode, and there
are no other requirements, then I too would configure sparse mode, and
probably use the ip pim auto-rp listener command.
In my email though, I was referring to the less clear case where there were
additional requirements so that configuring sparse mode only would probably
not work. I keep reading that interfaces are treated as sparse if they know
of an RP, so in that case I was thinking that configuring them as
sparse-dense and making sure that an RP was known, would meet the
requirements of sparse mode as well as some additional requirements.
Thanks,
Gerry
Kenneth Wygand wrote:
>Gerry,
>
>My opinion... If "one is asked to configure sparse mode", hey, you'd better
be configuring SPARSE mode... not Dense mode, not Sparse-Dense mode, but
SPARSE mode... This is just my opinion.
>
>However, take a look at the following command in the Doc CD:
>
>"ip pim auto-rp listener"
>
>It may answer some of your question for things that previously "required"
dense-mode...
>
>HTH,
>Ken
>
>________________________________
>
>From: nobody@groupstudy.com on behalf of Gerry Hilton
>Sent: Tue 7/20/2004 7:12 PM
>To: ccielab@groupstudy.com
>Subject: Multicast - Sparse Mode
>
>
>
>Hi there. A few questions about multicast and sparse mode:
>
>If one is asked to configure sparse mode, then is it valid to configure
>ip pim sparse-dense mode and have a known RP, as then the interfaces
>would be treated as sparse mode (this would be if there was a case
>where just configuring sparse mode would not meet all requirements)?
>
> If the interfaces are configured as sparse-dense and the RP is known
>via auto-RP, then are they still considered to be acting in sparse
>mode? If not, then is the only way to know the address of the RP and
>still be considered sparse mode, to manually configure the RP address
>on each router?
>
>This is only in the case where one requires the interfaces to be
>configured in sparse-dense mode but treated as sparse.
>
>Thanks,
> Gerry
>
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