PIM Multicast simple question

From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Nov 02 2003 - 11:38:43 GMT-3


Hi all,

When Multicast is enabled on a router, by default, IGMP is enabled on Lan
interfaces. That being the case, is it necessary to also enter the interface
command,

 ip pim <dense-mode|sparse-mode| sparse-dense-mode>,

when there are only multicast hosts attached to that interface and no
possibility of other routers connecting to that interface?

For example, if you have the following multicast network,

R2------R1(E0)------switch------mcast hosts only

does, ip pim <dense-mode|sparse-mode| sparse-dense-mode>

need to be entered on the E0 interface of R1? Please explain why or why not.

Thanks, dt



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