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Assuming that R1 has only one inteface connected to FR switch and there is a single network among R1,R2 and R3.
For multicasting in NBMA network when any traffic exits out R1 interface towards FR cloud it will be received by R2 and R3 both, and that is not desireable. suppose you want the multicast communication only between R4 and R3, then wat to do. Here comes “ip pim nbma-mode” command , that has to run on Hub router (R1 in this case). after running this command you will see the remote IPs along with outgoing interfaces in the mroute entries (show ip mroute). by this your FR circuit’s bandwidth will efficiently be used. eventually, when the traffic comes from R4(for R3) on R1 , it (traffic) will only be forwarded towards R3 (or to its particular DLCI). Mind it , ip pim nbma-mode works only for Sparse mode.
Also if you have 5 spoke in your network connected to HUB and you want to have multicast communication only in between sopke1 and sopke 2 , the solution is ip pim nbma-mode.
2nd solution can be having multiple point-to-point subinterfaces on R1 with different networks
thanks and regards,
On Wed, Jul 9, 2008 at 1:48 PM, Emran wrote:
> Hi experts, > > Kindly correct my concept regarding nbma mode in multicasting , i m > confused. As my multicasting is not good. > > I have scenario; > > R1 is hub > R2 and R3 and spoke. > and R4 is point to point with R1 . > > I have to configure sparse mode in all of these routers > Do i need to say ip pim nbma mode on the hub R1 ??? > > When and Where do we say ip pim nbma mode ?? > What is R4 is not there Do Still i have to say ip pim nbma mode ?? > > > > Thanks and Regards, > Muhammad Emran > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > > > >
— Fahad Khan