[openib-general] question regarding GRH flag in ib_ah_attr

[Roland Dreier]

    Hal> Huh ? In this case, aren't the subnet prefixes are required
    Hal> to be different ?

It's kind of a crazy thing to do but I don't see anything in the IB
spec that forbids two subnets with the same subnet prefix, or any
reason why a router couldn't route between them.  The SMs would just
have to be smart enough to return the LID of the router for paths to
ports on the other subnet, and the routers would have to have explicit
routes rather than forwarding based on just GID prefix.

 - R.