From: Rick Mur (rick@rickmur.com)
Date: Thu Dec 11 2008 - 06:43:20 ARST
I guess the books are wrong :-)
The highest IP address wins, when electing a BSR and when electing an RP.
With Auto-RP there is no way to influence this, only with BSR (PIMv2) you
can influence this decission by using the 'ip pim dr-priority' command.
Rick Mur
CCIE #21946 (R&S)
CCNP, CCIP, JNCIA-ER, MCSE
rick@rickmur.com
On Wed, 10 Dec 2008 23:51:14 +0800
"Ed Man" <networkexpert08@gmail.com> wrote:
Agree higher BSR address wins
But in my problem, some books said when using bootstrap, pim routers
will
choose the smaller C-RP address as a RP,
my lab shows the pim router use the higher C-RP address as the RP.
Any clues why it is?
On Wed, Dec 10, 2008 at 11:02 PM, Rick Mur <rick@rickmur.com> wrote:
> Auto-RP does the same thing, highest IP address wins.
>
> With BSR you can set the dr-priority to influence this.
>
> Rick Mur
>
> CCIE #21946 (R&S)
>
> CCNP, CCIP, JNCIA-ER, MCSE
>
> rick@rickmur.com
>
> On Wed, 10 Dec 2008 14:57:23 +0000
>
> "Marko Milivojevic" <markom@markom.info> wrote:
>
> BSR will automatically select the one with the higher address.
>
> Take a look at this document:
>
>
> http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/rps.html#wp1033721
>
> --
>
> Marko
>
> CCIE #18427 (SP)
>
> My network blog: http://cisco.markom.info/
>
> On Wed, Dec 10, 2008 at 14:47, Ed Man <networkexpert08@gmail.com>
>
> wrote:
>
> > Hi Group,
>
> >
>
> > R7#sho ip pim rp map in-use
>
> > PIM Group-to-RP Mappings
>
> >
>
> > Group(s) 224.0.0.0/4
>
> > RP 10.224.1.2 (?), v2
>
> > Info source: 10.224.1.2 (?), via bootstrap, priority 0, holdtime
>
> >150
>
> > Uptime: 01:16:14, expires: 00:02:07
>
> > RP 10.224.1.1 (?), v2
>
> > Info source: 10.224.1.2 (?), via bootstrap, priority 0, holdtime
>
> >150
>
> > Uptime: 01:17:52, expires: 00:02:11
>
> >
>
> > Dynamic (Auto-RP or BSR) RPs in cache that are in use:
>
> > Group(s): 224.0.0.0/4, *RP: 10.224.1.2*, expires: 00:00:55
>
> >
>
> >
>
> > Don't know why the RP is 10.224.1.2 but not 10.224.1.1?
>
> > Some book said the smallest candidate RP address makes the
>tie-break.
>
> >
>
> > Could you please give me some clues?
>
> Blogs and organic groups at http://www.ccie.net
>
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