Thank you for your replies. This is what I was looking for. Bob
________________________________ From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Ronald van der Laan Sent: Monday, June 15, 2009 4:03 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Sharing OSA between vm lpars Bob, No problem. On the z800/z900 and an old OSA microcode level all users needed to be in layer 2 or layer 3 mode, but with the z890/z990 you can mix layer 2 and layer 3 usage. Note that you can also mix layer 2 and layer 3 usage within the same z/VM lpar, for VSWITCHes and/or guests, as long as each user gets its own OSA address triplet. Ronald van der Laan