[openib-general] Dump and load routes with opensm?

[amith rajith mamidala]

MVAPICH uses multicast support. It doesnot use SA queries currently. But,
we plan to use this feature for multicast in the future,

Thanks,
Amith

On 4 May 2006, Hal Rosenstock wrote:

> On Thu, 2006-05-04 at 14:41, Greg Johnson wrote:
> > On Thu, May 04, 2006 at 01:48:29PM -0400, Hal Rosenstock wrote:
> > > On Thu, 2006-05-04 at 13:26, Greg Johnson wrote:
> > > > On Thu, May 04, 2006 at 01:08:54PM -0400, Hal Rosenstock wrote:
> > > > > On Thu, 2006-05-04 at 12:55, Greg Johnson wrote:
> > > > > > I actually want routes.
> > > > >
> > > > > OpenSM calculates the unicast and multicast routes and populates the
> > > > > (unicast and multicast) forwarding tables.
> > > > >
> > > > > > I have queried them with ibtraceroute and ibroute,
> > > > >
> > > > > ibroute dumps the forwarding tables and ibtracert traces the path from a
> > > > > source to a destination so these are displaying how OpenSM has setup the
> > > > > fabric which is a function of the routing algorithm chosen and the
> > > > > physical topology (which may be dynamic).
> > > > >
> > > > > > but we need routes for the whole fabric.
> > > > >
> > > > > Unicast, multicast, or both ? Just to look at ? There is no way to load
> > > > > these into OpenSM.
> > > >
> > > > At this point we are only interested in unicast routes.  We would like
> > > > to be able to dump and load the forwarding tables.
> > >
> > > You can dump them (via ibroute) just not load them.
> >
> > Right.  I imagine a tool that would dump the routes to a file that could
> > be reloaded later.  If I could edit the file, I could load my own
> > routes as well.
> >
> > > > We have a single 288 port switch chassis for our cluster.  We would like to be able to
> > > > load routes for two reasons.  One is to be able to do testing
with a
> > > > fixed set of routes.
> > >
> > > So the topology is fixed and no links ever fail ?
> >
> > Yes, basically.  We want this for testing, not production (at this
> > point).  We can handle faults manually for now.  The internal topology
> > of the switch chassis is fixed.
> >
> > > > The other is that we would like to program our own
> > > > routes into the switches.
> > >
> > > Once the fabric is up, what are the requirements ? Do you need SA
> > > queries (e.g. PathRecords) to work ?
> >
> > I'm not sure if we need SA queries.  What are they good for?
>
> Helping to set up connections, etc.
>
> > Basically, we want to be able to run MPI over the IB fabric.  We don't need
> > anything else.  I'm not sure if MVAPICH or OpenMPI use SA queries
> > internally.
>
> I don't think they do currently but will in the near term future. I'm
> not sure whether MVAPICH supports multicast but that also would require
> SA support.


>
> -- Hal
>
> > Greg
>
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