thanx again,I completely agree with your explaination,but my routers are learning rp through auto-rp without auto-rp listener command .plz See the following output(IP address has been changed for security reasons) and RP is certainly not adjacent to this edge router and all interfaces are enabled in sparse mode.
I don't know enough about your network to comment but what I know for a fact is that you either need to be adjacent to the RP, have autorp listener enabled or have interfaces configured as sparse-dense for the RP discovery to work properly.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) firstname.lastname@example.org México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
The AUTO-RP groups may be operating in sparse-mode resulting in shared trees for these groups. It may work in some cases but in a large network it would be nonderministic. You need to run sparse-dense or autorp-listener, I believe there may be some changes in recent IOS versions so Auto-RP can operate with the interface set as sparse only but Auto-RP will still operate in dense mode.
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