From: Hossam (sam6626@yahoo.com)
Date: Fri Feb 06 2004 - 16:29:30 GMT-3
As stated in the Doc CD and Cisco web site, i understand the NBMA-mode over NBMA networks as a better solution to save unneeded traffic to routers that share an NBMA network.
The techique uses the PIM-SM join packets to learn abt the NMBA neighbours IPs.
In summary the nmba-mode 2 functions are:
1- To identify all routers on the NMBa interface with their IPs. So when any routers sends a PIM join packet to the HUB, the HUB will only send the multicast traffic to this intersted router only.
Without the NMBA mood the HUB will copy the multicast packets to all nmba neighbours(wheather they r intrested or not) who has a the broadcast keyword.
2- To solve the problem that arrises from the fact that the PRUNE - Override technique is not efficent over the NMBA.
Knowing these facts i can understand why it is useless to use NMBA mode with PIM -Dense mode ( PIM-Dense uses flood and prune and and it has no join/prune messages).
My question is Why is it NOT recommended to use the NBMA mode with PIM - Sparse - Dense mode.
I hope someone can help....
Thanks
SAM
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This archive was generated by hypermail 2.1.4 : Fri Mar 05 2004 - 07:13:47 GMT-3