From: Lord, Chris (chris.lord@lorien.co.uk)
Date: Mon Aug 09 2004 - 06:00:52 GMT-3
Please can someone help me to understand this......
I have three routers:
e0-R1-s0---s0-R2-s1---s0-R3-e0
PIM-SM is configured on all of the interfaces.
R1-e0 has an ip igmp join for three groups 224.1.1.1, 224.2.2.2 and 224.3.3.3
R1 and R2 use R3-s0 as the RP for groups 224.1.1.1 and 224.2.2.2. There is no RP configured for 224.3.3.3
Results - I can ping 224.1.1.1 and 224.2.2.2 from any router as expected. What I didn't expect is that I can also ping 224.3.3.3 from R1 and R2 (but not R3). When I look in ip mroute for 224.3.3.3 it is operating in DM on R1 and R2 even though only PIM-SM is configured. Why is this?
TIA.
Chris.
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