[ofa-general] Re: [openib-general] Fw: [PATCH] enable IPoIB only if broadcast join finish

[Shirley Ma]

Roland Dreier <rdreier at cisco.com> wrote on 03/01/2007 03:43:09 PM:

>  > Setting carrier on should be OK here. ND can't send out before the
>  > interface is capable for sending any packet. And if ND messages can't
reach
>  > the correct destination because of multicast join failure later then
the
>  > IPv6 address is useless.
>
> Your patch turns on the carrier before all multicast joins have
> completed.  But if ND messages are sent too early, and a duplicate
> address is chosen, and then multicast joins complete later, a fabric
> might end up with duplicate IPv6 link-local addresses, right?  Or is
> there some reason that can't happen?
>
>  - R.

IPv6 ND doesn't prevent the duplicate IPv6 link-local address in the
network. It only saves a warning in /var/log/messages to indicate that this
address is duplicated in the network. ND can detect this when sending
packets.

Thanks
Shirley Ma
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