Oh, there is no OSA associated with the VSwitch (it's internal only).
Frank M. Ramaekers Jr.
Systems Programmer MCP, MCP+I, MCSE & RHCE
American Income Life Insurance Co. Phone: (254)761-6649
1200 Wooded Acres Dr. Fax: (254)741-5777
Waco, Texas 76710
-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Alan Altmark
Sent: Wednesday, November 11, 2009 1:40 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TCP/IP and VSWITCH
On Wednesday, 11/11/2009 at 01:58 EST, "Frank M. Ramaekers"
<framaek...@ailife.com> wrote:
> Okay, I was originally trying to "short circuit" an IP route through
the
> VSwitch (rather than creating a subnet and a new set of IP addresses).
> The z/VSE system would have only one address, 10.1.20.2 and z/VM would
> have a single address of 10.1.20.20. All the IP traffic would go to
the
> ETH0 interface, except for those to this particular z/VSE (.2), which
> would use the VSWitch.
>
> We have done this with Hipersockets (or is it Hypersockets) from z/VSE
"HiperSockets"
> to z/VSE. Now, I want to start moving these connections to VSwitches.
> So, on my first attempt, I was trying to the z/VSE TCP/IP to talk to
our
> test z/VSE system via the VSwitch (keeping the same IP addresses).
The VSWITCH already has a built-in shortcut to other guests on the same
[VLAN on] the same VSWITCH. You don't need any routing. When a guest
sends packets out into the VSWITCH, CP will automatically "short
circuit"
them to other guests. It's a switch and that's what switches do - they
look for local ports before they send it down the trunks to other
switches.
You can turn off the short circuit by using VSWITCH Isolation. Only in
this case will outbound guest traffic be forced onto the OSA. And if
you
have a z10, the OSA will be told to force the packet onto the wire,
bypassing the OSA "LPAR-LPAR" short circuit.
Alan Altmark
z/VM Development
IBM Endicott
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