[openib-general] IB mcast question

[Sean Hefty]

>Is the IP address only used locally to construct the MGID ? What does
>the MGID look like ? What signature does it use if any ?

The IP address may also used be used to lookup routing information in order to
bind to a local device.  The address is then used locally construct the MGID.
The MGID looks a lot like the ipoib MGIDs, with a byte 8 being 0x01.

- Sean