Jack> 1. Why is this a send-only join? Is this just so that the
Jack> local host to "announce" itself to a router (for neighbor
Jack> calculations)?
Because the kernel has asked the IPoIB driver to send a packet to this
group, but has not asked the IPoIB driver to start
Jack> 2. Who is responsible for creating this multicast group in
Jack> IPoIB? (A send-only join will not cause a group to be
Jack> created if it does not yet exist)
The group will be created if any full-member joins are done. But that
won't happen unless some entity wants to receive packets from the
group -- in other words, some multicast router.
- R.
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