[ofa-general] IPoIB arp relation to the SM

[Todd Bowman]

All,


I am trying to have a better understanding of how the SM and IPoIB interact
with respect to arp.  If there is a document that describes this please
point me in the right direction.

In the past, (OFED 1.0 and pre OFED 1.0) I observed the the following:

1) Using hosts A,B

A> ping B  (succeeded)
A> opensm stop
A> arp -d  B
A> ping B   (Failed)


2) Using opensm-3.1

A> ping B  (succeeded)
A> opensm stop
A> arp -d B
A> ping B  (succeeded)
A> ping C  (failed)



In scenario 2, what allows the arp query for B to be resolved after the SM
is stopped and arp entry cleared?
Is this due to connected mode, in that an RD connection is already
established?
Or is there an underlying cache that feeds the ARP cache?

Thanks,
Todd
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