From: Surendran (surenv@hpssk211.sgp.hp.com)
Date: Sun Dec 08 2002 - 03:11:39 GMT-3
Hi Group,
I have some question on Multicast over NBMA. I read from Cisco
documentation that NBMA mode is to be used in a frame relay cloud and ip
sparse mode should be used with this. However, I also understand
Auto-RP, requires dense mode to broadcast its RP group advertisements.
For example below,
R1------R2-------FR--------R3
\
\___ R4
R1 and R2 are connected to each other with ethernet cable. R2 is the
central hub and R3 & R4 are spokes in the frame-relay cloud. Lets say, I
am using R1 as my Candidate-RP and Mapping Agent. According to Cisco
documentation I must run ip pim nbma-mode & ip pim sparse mode. R1 will
be sending out RP information to all the routers. However, in a sparse
mode environment the routers R3 & R4 must join the group 224.0.1.40 to
receive this information in the first place. Theoretically, should not
work....how then does it work?
Any idea?
Suren
.
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