I had a picture but it didn't have the subnets. It does now and I see a potential problem, the VM subnets don't match the MVS subnets. How did I manage that?!
Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474 -----Original Message----- From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf Of Mark Post Sent: Friday, January 23, 2009 12:01 PM To: [email protected] Subject: Re: VSWITCH seems to be causing problems on MVS >>> On 1/23/2009 at 11:52 AM, "Bauer, Bobby (NIH/CIT) [E]" >>> <[email protected]> wrote: > This is really strange! We have a z9 with 4 MVS lpars and a VM lpar and a > couple of Linux guest. There is a hipersocket link between 2 of the MVS > lpars, VM and the Linux guest. There is also a vswitch running layer 3. The > MVS lpars have 2 dedicated OSAs and the VM lpar has 2 different dedicated > OSAs. A couple of days ago when I detached the vswitch in order to rebuild it > for layer 2 we lost connectivity with the 2 MVS lpars that have a hipersocket > connection. Since the Linux guest were down, I IPLed VM and connectivity to > the MVS lpars came back. I've repeated this 2 more times (off hours) with the > same results. Seems destroying the vswitch is causing a problem. A dump of > TCP on the MVS lpars doesn't show any problems. > > I'm open to any suggestions. I have test time this weekend but I'm not sure > what to try. I would draw a picture of what IP addresses are where, for all network interfaces involved (including subnet masks) and what routes are defined where, along with default gateways. I would also try to get routing information from the first-hop routers outside the box to complete the picture. Mark Post
