Hey Robert, I had to go back to the old rack and test this out : ) I always remember when I was studying that I put it on the sub-interface, and my testing has confirmed this.
I set up basic frame-relay... R2 as the hub with a multipoint
subinterface. R5 and R6 the spokes with physical interfaces. I made R2 the
auto-rp advertiser and MA. I put ip pim nbma-mode on the R2 sub-interface,
and igmp join-group 239.0.0.5 on the spoke interfaces. Check out part of
the mroute on R2:
(*, 239.0.0.5), 00:08:38/00:03:21, RP 200.0.0.2, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial2/0.256, 150.100.100.6, Forward/Sparse-Dense, 00:00:08/00:03:21
Serial2/0.256, 150.100.100.5, Forward/Sparse-Dense, 00:02:17/00:03:12
So as we can see, it sees both spokes joining, but differentiates them by IP
address, not just interface. So, I believe putting it on the sub-interface
works fine.
On Mon, May 18, 2009 at 11:20 AM, Robert S Wyzykowski <[email protected]>wrote:
>
> In a situation where a Serial interface has sub interfaces, where would you
> use the ip pim nbma-mode command?
> On the physical interface, or on the sub interface?
>
> My "guess" is physical interface.
>
> Thanks!
>
> Robert Wyzykowski
> Manager, Global Telecommunications
> IMERYS
> 30 Mansell Court East - Suite 220
> Roswell, GA, USA
> Phone: +1 770 645 3734
> Mobile: +1 404-434 9000
>
>
>
--
Regards,
Joe Astorino
CCIE #24347 (R&S)
Sr. Support Engineer – IPexpert, Inc.
URL: http://www.IPexpert.com
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