[openib-general] Re: IPoIB and lid change

[Michael S. Tsirkin]

Quoting Hal Rosenstock <halr at voltaire.com>:
> > > > Hi, Roland!  One issue we have with IPoIB is that IPoIB may cache a
> > > > remote node path for a long time. Remote LID may get changed e.g. if the
> > > > SM is changed, and IPoIB might lose connectivity.
> > > 
> > > 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 ?
> > 
> > Change the SM to trigger SM lid change for both subnets?
> 
> I think that's overly disruptive for the subnet whose SM didn't change.
> There should be a gentler way...

So that another issue with IPoIB subnet spanning multiple IB subnets.
The IPoIB spec already lists several of these.

-- 
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies