sparse-mode and auto-rp

From: Peng Zheng (zpnist@yahoo.com)
Date: Sat Jun 12 2004 - 22:30:32 GMT-3

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R1(s0)----------(s0)R2(s1)-----(s1)R3(e0)
  |(bri0) (bri0)|
  |__________________|

Run ospf on all the interface.

ip pim sparse-mode under lo0 of R1 and R2, bri0 on R1
and R1, s1 on R2 and R3.

And
lo0 of R1 is rp.
lo0 of R2 is MA.

I thought auto-rp only work with sparse-dense-mode,
but in my config, if I config: ip igmp join-group
225.25.25.25 under e0 of R3, then I can ping it from
r1 and R2.

And also I don't need to config ip pim sparse-mode
under e0 of R3.

I want to know if auto-rp can work with sparse-mode
and if I need to config ip pim sparse-mode under the
interface where I type ip igmp join-group?

Thanks for any comment.

        
                
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