From: asadovnikov (asadovnikov@comcast.net)
Date: Sat Feb 07 2004 - 01:19:07 GMT-3
Although there is nothing in PIM NBMA to make dense implementation
technically impossible, it currently not implemented (there are certain
scalability concerns I understand to get it implemented, and on top of that
dense mode is not really popular in production networks). So it would be
possible to do dense implementation of pim nbma, but currently sparse is all
which is there.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Hossam
Sent: Friday, February 06, 2004 2:30 PM
To: ccielab@groupstudy.com
Subject: NBMA- Mode with Dense and sparse-dense PIM!
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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