From: null void (nullv0idmain@yahoo.com)
Date: Fri Feb 04 2005 - 13:18:09 GMT-3
Say we have the following topology:
R1 - is the hub of frame relay hub-spoke toplogy. Serial 0/0.1 multipoint goes to 2 spoke routers R2 , R3. Serial 0/1.1 point-to-point goes to R6's S0/1 this is frame-relay circuit also
R6 - is a standalone stub router with a point to point serial sub interface off of Ser0/1 to R1's S0/1
R3 - Ser0/0 physical interface connects into R1 the frame relay hub router's s0/0.1 multipoint so R3 , R2 and R1 are all layer 3 reachable on same ip subnet in hub spoke topology.
If we configure say R3 as RP on its loopback 0 interface for all groups. Then configure ip pim sparse-mode on all interfaces of R3 , R6 , R1 . So now R3 , R6 and R1 see each other as pim neighbors and the RP is found being hardcoded to R3 loopback . Is IP PIM NBMA mode required on R1's S0/0.1 multipoint and s0/1.1 point to point interfaces ?? Without it I can still from all multicast enabled routers , in this case being R3 , R6 and R1 ping the groups that we configured onto R6's Loopback 0 interace via the ip igmp join-group x.x.x.x command so it is working ... But my question is when is ip pim nbma requried and why ??? Any resources / docs on this would be greatly appreciated... TIA Null
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