From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Wed Jul 04 2007 - 18:09:10 ART
Thanks for this Mike.
When Eric posted this question I wondered if the higher IP address was the
key to the Auto-RP mapping agent preference. I think that's what you are
saying? I started scrounging around in my books but nothing else seemed to
indicate a preference of one over another.
Gary
----- Original Message -----
From: "Mike Kraus (mikraus)" <mikraus@cisco.com>
To: <eric_dobyns@yahoo.com>; <ccielab@groupstudy.com>
Sent: Wednesday, July 04, 2007 9:01 PM
Subject: RE: Primary and backup RP in Multicast
> Yep! So, either you can modify/create IP addresses to make this occur,
> or just choose a different interface on the router to make this happen.
> Either way works, but your scenario make force you to use one option
> over another.
>
> -----Original Message-----
> From: Eric Dobyns [mailto:eric_dobyns@yahoo.com]
> Sent: Wednesday, July 04, 2007 2:59 PM
> To: Mike Kraus (mikraus); ccielab@groupstudy.com
> Subject: RE: Primary and backup RP in Multicast
>
> So if you want one to be primary, you make sure it's source interface
> has a higher IP address than the backup? (assuming they are advertising
> the same
> prefixes)
>
> -----Original Message-----
> From: Mike Kraus (mikraus) [mailto:mikraus@cisco.com]
> Sent: Wednesday, July 04, 2007 12:52 PM
> To: Eric Dobyns; ccielab@groupstudy.com
> Subject: RE: Primary and backup RP in Multicast
>
> For RP conflict resolution, longest-match prefix is used, if a tie then
> highest IP address. For mapping agents, highest IP address is speaker.
> So, if you have any RP-announce-filters or anything, you'll want to make
> sure they are the same on all mapping agents.
>
> See 3.2 from:
> ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Eric Dobyns
> Sent: Wednesday, July 04, 2007 2:24 PM
> To: ccielab@groupstudy.com
> Subject: Primary and backup RP in Multicast
>
> Multicast question I can't find an answer to.
>
>
>
> Let's say you have sparse-dense mode turned on and you configure two
> auto-rp's. How do you make one preferred over another
> (primary/secondary)?
>
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