From: olumayokun fowowe (olumayokun@gmail.com)
Date: Tue Jan 27 2009 - 14:05:37 ARST
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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