From: Godswill Oletu (oletu@inbox.lv)
Date: Tue Nov 15 2005 - 05:29:55 GMT-3
John,
The auto-rp listener is used to overcome the need to configured a
sparse-dense-mode, when you actually only need sparse mode, but still to use
auto-RP. The candidate-RP and mapping agent using multicast address
224.0.0.39 & 224.0.0.40 must communicate using dense-mode ie the path from
the candidate-RP to the mapping agent must be sparse-dense-mode or
dense-mode, for the mapping agent to hear the announcements from the
candidate-RP.
When you then configure auto-rp listener, you are essentially telling the
multicast process to use dense-mode communication for multicast address
224.0.0.39 & 224.0.0.40 and sparse-mode for other multicast addresses, with
that you can use sparse mode throughout your network and candidate-RP and
mapping agent will still be able to talk to each other.
There is no requirement for your candidate-RP & mapping agents to be
directly connected, you can always use the 'scope' option to increase the
value of the TTL (max. of 255) and that will compensate for the number of
hop counts between the candidate-RP and the mapping agent. Note that there
is a little tweakling to this behave in an NBMA network, where one have to
carefully plan the placement of his/her mapping agent and the candidate-RP
and might also use the 'ip pim nbma-mode' command.
Try it out in your lab, and let us know how it works out for you.
HTH
Godswill
----- Original Message -----
From: "John Matus" <John.Matus@tokiom.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, November 15, 2005 6:52 PM
Subject: multicast auto-rp listener question
> is the auto-rp listener command used in the case that you are using
> auto-rp/sparse-mode and the mapping agent is not directly connnected to
the
> mapping agent.....so you use the auto-rp-listener on this router to
> overcome the limitation of not being directly connected to the mapping
> agent......or am i way off?
>
> Regards,
>
> John D. Matus
> Technical Support / PAS
> Fujitsu Consulting
> 626-568-7716
> John.Matus@tokiom.com
>
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