Hal Rosenstock wrote:
Hi Yevgeny,

Is it possible that OpenSM's fat tree routing somehow depends on the
LIDs previously assigned ?

It depends only on the existence of the LIDs.

It seems that for a legitimate fat tree topology, the topology sometimes
won't come up as a fat tree if reassigning LIDs (-r) is not used.

That's odd...

In addition to -r making fat tree work, certain routing algorithms seem
to also clear this out (without using -r). For example, if lash were run
and then ftree, it seems to work without doing the -r. (Haven't yet
tried updn).

Any ideas on this ? Should a bug be filed on this ? Thanks.

No ideas whatsoever. Please file a bug on this.
It would be nice if I could reproduce it in simulation.

-- Yevgeny

-- Hal




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