Bryan is exactly right Ed, but to add to that - basically it is a "hack" of sorts that Cisco came out with so that they could cheat and allow people to configure AutoRP (a Cisco baby) after sparse-mode came out. Sparse-mode of course was way more efficient, so everybody started using that - but AutoRP could only work in Dense mode.
So basically what they did is they said OK if you configure sparse-mode, we are going to go ahead and allow 2 multicast groups (224.0.1.39 and 224.0.1.40 which happen to be the groups for AutoRP) and those groups ONLY to actually operate in dense mode. Everything else is sparse haha we win because we are Cisco J Hope that helps Regards, Joe Astorino CCIE #24347 (R&S) Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com From: [email protected] [mailto:[email protected]] On Behalf Of Bryan Bartik Sent: Wednesday, July 08, 2009 10:37 PM To: Bodnar, Edward Cc: ccie_rs Subject: Re: [OSL | CCIE_RS] Autorp listener Use it when you have sparse-mode only on the interfaces and are using Auto RP. Don't use it if: you are using sparse-dense mode you are using BSR you are using static RP -hth On Wed, Jul 8, 2009 at 8:33 PM, Bodnar, Edward <[email protected]> wrote: I still don't get it. I am just not sure when I need to use autorp listener. Just seems like it's randomly used. Can anybody give me the criteria when I would use this. I thought it was when you use sparce-mode. But some times it's used some times it's not. -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com Checked by AVG - www.avg.com Version: 8.5.386 / Virus Database: 270.13.8/2224 - Release Date: 07/08/09 05:53:00
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