I actually just filed a Github issue to ask this exact question:
https://github.com/open-mpi/ompi/issues/2326
> On Nov 1, 2016, at 9:49 AM, Sergei Hrushev <hrus...@gmail.com> wrote:
>
>
> I haven't worked with InfiniBand for years, but I do believe that yes: you
> need IPoIB enabled on your IB devices to get the RDMA CM support to work.
>
>
> Yes, I saw too that RDMA CM requires IP, but in my case OpenMPI reports that
> UD CM can't be used too.
> Is it also require IPoIB?
>
> Is it possible to read more about UD CM somewhere?
>
>
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--
Jeff Squyres
jsquy...@cisco.com
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