[openib-general] IPoIB and lid change

[Hal Rosenstock]

On Sun, 2006-02-12 at 08:25, Eitan Zahavi wrote:
> Hi 
> 
> The issue with IPoIB address change is not just LID change but also QP
> change.
> (IPoIB define the MAC to be QP,GID) .
> 
> Anytime you do ifconfig down/up you might get a new QP and thus you need
> to refresh the ARP...
> 
> I second Mike K. and propose we use gratuitous ARP reply whenever an
> IPoIB interface is brought up.

That helps but not sure this is a total solution as I think there are
nodes which do not cache a gratutious response unless they requested it
(as it is not a requirement to do so).

-- Hal

> > I wonder if this is why when I reload the IB drivers on one node
> > I sometimes have to reload them on other nodes too. Otherwise
> > ping over IPoIB doesn't work.
> > 
> > > The remote LID may get changed for other reasons too without an SM
> > > change (SM merge of 2 separate subnets). How can this be handled ?
> > 
> > Isn't this just another case of the SM changing for one of the
> subnets?
> > 
> > grant
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