Thanks Alan from your response I did a little perusing of the Doc. Layer 2 is 
available at zVM 5.1(poss 4.4)? How will the define vswitch that does not 
specify IP or ETHERNET default? Could you give me some examples within a zVM 
Linux VLAN infrastructure you would want/need layer 2? Possibly apps that will 
require MAC level support or the response improvments provided by Layer 2 
support?
Thanks, 
Alan Schilla
State of Minnesota

-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
Alan Altmark
Sent: Wednesday, May 11, 2005 9:55 AM
To: LINUX-390@vm.marist.edu
Subject: Re: Can't get vlan to work on suse sles9 64-bit


On Wednesday, 05/11/2005 at 09:42 EST, Alan Schilla
<[EMAIL PROTECTED]> wrote:
> I've seen this mentioned before but I fail to understand the meaning. By
layer
> three are you saying do not use VSWITCH?

The VSWITCH is capable of offering its services in layer 2 mode (ethernet)
or layer 3 (IP).  If the vswitch is operating in layer 2 mode, then the
guests must drive their virtual adapaters in layer 2 mode also.

It's just a matter of whether the guest is sending/receiving ethernet
frames and handling ARPs itself (layer 2), or whether the guest
sends/receives IP packets (no frame headers/trailers) and the OSA takes
care of the ARPs (layer 3).

The VLAN capabilities of the vswitch are the same in either case.

Alan Altmark
z/VM Development
IBM Endicott

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