Auto RP with sparse-mode and no dm-fallback..and its working

Hello Group ,

this might be a silly question but...still I wish to learn how :) ..I'm tired
of multicast really

I have this setup

f0/0--R1----LAN-----R2-----FR-----R3---LAN---R5

- I have put ip pim sparse mode on the interfaces
- configured auto rp on R2 with specific ACL
-put no ip pim dm-fallback on R2 & R3
-Join the group I permitted with the ACL on R1 F0/0

my question is ....how come ( without any pings from R3 ) I see the rp mapping
on R3 & R5 ? if I'm blocking the 39 & 40 groups as I'm using ACL with the RP (
correct ? ) and I'm putting no ip pim dm-fallback

where is the trick ?

Thanks....

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Received on Tue Aug 25 2009 - 23:09:18 ART