One stack connected to the OSA can be designated as the primary_router. It
doesn't matter if they are in seperate LPARS or guests in the same LPAR,
only one, regardless of microcode level.  If you need to have two stacks
with primary_router specified, you need to OSA cards.  Note that unless
z/OS is actually acting as a virtual router, there's no need for it to
specify primary_router.

Regards,
Miguel Diaz
Staff Software Engineer
TCP/IP for z/VM


Linux on 390 Port <[EMAIL PROTECTED]> wrote on 05/19/2004 02:09:28
PM:

> I've forgotten just when and how this changed.
>
> Let's say I have a Linux guest (2.4.something) running under z/VM and he
> has a dedicated QDIO OSA.  But that's dedicated from the point of view
> of the LPAR and the OSA is shared with other LPARs.  I want to make him
> into a router machine to get to guest LANs behind him (but not use
> VSWITCH).
>
> I've got to set primary_router for the OSA device to allow routing.
> Now, can I set that once per LPAR, or can only one of the LPARs using
> that OSA have primary_router set?  That is, if the OSA is also being
> used by z/OS in another LPAR, can only one of us have primary_router set
> on it?
>
> Does this change with the microcode level in the OSA?
>
> Adam
>
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