[ofa-general] Re: [Query] ib add path record cache

[Hal Rosenstock]

On Thu, 2007-05-31 at 13:54, Sean Hefty wrote:
> > You'd need to use a vendor class 2 if you wanted to use RMPP as the SA
> > does. However, there is some rearranging you would need to do if you
> > compare the relevant MAD formats.
> 
> Vendor class 2 just adds the OUI, correct?

Yes, so there are 4 less bytes available.

> I guess you could either move the SA specific header by 4-bytes,

Yes, everything starting with SM_Key.

>  or use a 32-bit key.

I think that was deemed too weak and why 64 bits was chosen to begin
with.

> It's not clear to me when to use vendor-specific versus application 
> specific, but I think that we could use application specific as well.

Yes, but there would be more work involved for RMPP. There is no way to
know if such a class uses RMPP.

> The mad layer just wouldn't know to enable RMPP as easily as it does 
> with vendor class 2.

Ugh... That's an understatement.

-- Hal

> - Sean