If another device on the same subnet has auto-rp configured then the device will receive it. But it will not forward it without a join request. So is there another device on the same subnet that you did configure auto-rp on? If so then there is the answer to your question.
Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor - IPexpert, Inc. Mailto: [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com <http://www.ipexpert.com/> From: [email protected] [mailto:[email protected]] On Behalf Of jason lau Sent: Saturday, August 14, 2010 2:14 PM To: [email protected] Subject: [OSL | CCIE_RS] PIM autorp listener- Do I need it? in the Multicase Configuration lab, topology is R2 -- R4--- R1, R2 is RP and mapping agent, all routers' interfaces are in PIM sparse mode.according to docs, when R4 receives 224.0.1.40 traffic, it won't pass it to R1, the solution is config PIM auotp listener on R4, so R4 can flood 224.0.1.40 to R1. However, in my lab, why without PIM auotp listener command on any router, R1 still receive 224.0.1.40 and get correct RP mapping? as I said, NO any interface is in sparse-dense mode, all are in spare mode. Thanks Jason
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