From: Jared Scrivener (jscrivener@ipexpert.com)
Date: Wed Jan 28 2009 - 03:44:07 ARST
Hey Olumayokun,
In your actual lab, the question will be pretty clear in indicating whether
you have to sue Auto-RP, BSR or static RP's as well as which PIM mode to
use. Note that when I say clear, they may indicate one type or another via
reference to the behaviour of the protocol (i.e. how it negotiates the RP,
or what multicast range it uses etc).
Cheers,
Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto: jscrivener@ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
olumayokun fowowe
Sent: Tuesday, 27 January 2009 11:06 AM
To: Daniel Kutchin
Cc: Cisco certification
Subject: Re: Backup RP
Hello Daniel,
Thanks for your reply. I now get the desired router to be the RP now by
using a loopback with a higher ip address. My ping sessions are still
successful, my sh ip mroute is showing that I am forwarding in sparse mode
meanwhile I still have not configured autorp listener on any of the devices.
What is your advice if I face a stuff like this in the lab exam, should I
just go ahead and configure autorp on the devices regardless of whether the
ping session are successful or not?
Thanks,
'Mayokun
On 1/27/09, Daniel Kutchin <daniel@kutchin.com> wrote:
>
> Olu -
>
> On getting a response from your pings, you need to first check, if your
> mcast traffic is really using an RP.
>
> sh ip pim rp or
> sh ip pim rp 224.2.2.2
>
>
> If there is no RP, then the default behavior is, the mcast traffic will
> be propagated in dense-mode.
>
>
> Sh ip mro 224.2.2.2 <--- and look for the (*,G) entry
> ...
> (*, 224.2.2.2), 02:02:39/00:02:08, RP 0.0.0.0, flags: DCL <- you'll see a
> "D"
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> FastEthernet0/0, Forward/Sparse-Dense, 02:02:39/00:00:00
>
>
> To your 2nd question, the Auto-RP candidate with the highest IP wins.
> This implies that you can force your preferred candidate to win if you
> choose
> the Auto-RP interfaces deliberately (they musn't always be Lo0).
>
> Yes, PIMv2 (BSR) has the "priority" parameter for such elections (but not
> Auto-RP).
>
> -
> Daniel
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> olumayokun fowowe
> Sent: Dienstag, 27. Januar 2009 09:36
> To: Cisco certification
> Subject: Backup RP
>
> Hello all,
>
> I have a scenario, sparse-mode multicasting is configured on the devices.
I
> should have two RPs configured with router B as a backup for the router A.
> The RPs should not be configured as static RPs and I should not use BSR.
> Apart from using " ip pim send-rp-announce....." and " ip pim
> send-rp-discovery...". I did the configurations without using
> autorp-listener and I am able to ping the required multicast groups. I
> thought we need to configure autorp-listener for non static rp to work?
> Secondly is there a command to force the devices to prefer one RP first
and
> failover to the second if the first is no longer availvable?
>
> Thanks,
>
> "Mayokun
>
>
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