[ofa-general] Re: [query] Multi path discovery in openSM

[Eitan Zahavi]

OpenSM will always use min-hop paths (no matter what routing algorithm
except maybe for LASH).
If you use the default algorithms OpenSM will tend to spread traffic
such that if you have used LMC=1 (2 LIDs per port)
The two paths going to LID0 and LID1 will go through different systems
or if not possible through different nodes.

EZ

Eitan Zahavi
Senior Engineering Director, Software Architect
Mellanox Technologies LTD
Tel:+972-4-9097208
Fax:+972-4-9593245
P.O. Box 586 Yokneam 20692 ISRAEL

 

> -----Original Message-----
> From: general-bounces at lists.openfabrics.org 
> [mailto:general-bounces at lists.openfabrics.org] On Behalf Of 
> Keshetti Mahesh
> Sent: Monday, September 24, 2007 8:54 AM
> To: openIB
> Subject: [ofa-general] Re: [query] Multi path discovery in openSM
> 
> > > If there are multiple paths between two end nodes in a 
> network and I 
> > > set the LMC > 0 then whether the openSM itself identifies those 
> > > routes and updates the switch forwarding tables or is it 
> the duty of 
> > > some other consumer ??
> >
> > OpenSM.
> 
> I am using min-hop algorithm with openSM.
> Now in this case, if there are multiple paths (some are not 
> min-hop paths) will the openSM(LMC > 0) configure those paths?
> 
> regards,
> Mahesh
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