You can have multiple subnets on one segment. For example, you can have 10.1.1.x and 192.168.1.x packets using the same segment of ethernet. There is nothing that prevents you from doing it and it is not uncommon.
Aria > -----Original Message----- > From: Linux on 390 Port [mailto:[email protected]] On Behalf Of > Mark Pace > Sent: Tuesday, June 01, 2010 4:19 PM > To: [email protected] > Subject: Re: z/VM and z/OS sharing OSAs? > > Okay - I'm going to show my ignorance here. How can you have multiple > subnets on the same OSA port? > > On Tue, Jun 1, 2010 at 4:16 PM, Marcy Cortes > <[email protected]>wrote: > > > "Since they are on the same port they are obviously on the same > subnet." > > > > Well no, you can have lots of subnets on the same port. > > > > But yes, you can share them with z/OS if you have to. > > > > Marcy > > > > "This message may contain confidential and/or privileged information. > If > > you are not the addressee or authorized to receive this for the > addressee, > > you must not use, copy, disclose, or take any action based on this > message > > or any information herein. If you have received this message in > error, > > please advise the sender immediately by reply e-mail and delete this > > message. Thank you for your cooperation." > > > > > > -----Original Message----- > > From: Linux on 390 Port [mailto:[email protected]] On Behalf Of > Mark > > Pace > > Sent: Tuesday, June 01, 2010 12:59 PM > > To: [email protected] > > Subject: Re: [LINUX-390] z/VM and z/OS sharing OSAs? > > > > I don't know a thing about the Cisco switch, but I have 3 LPARs, 1 > z/VM and > > 2 z/OS, sharing the same OSA Express-3 port. Since they are on the > same > > port they are obviously on the same subnet. > > > > On Tue, Jun 1, 2010 at 3:48 PM, Harder, Pieter < > > [email protected]> wrote: > > > > > I don't know about z10 (don't have one), but we run with two OSA > > 1000BaseT > > > as a failover pair shared between two z/OS and one z/VM/IFL lpars. > The > > > outside is one /24 network and we gave out individual host > addresses and > > use > > > a VSWITCH with two RDEVs on the z/VM side as well. The OSAs keep > track of > > > who is where and we never had a problem with this setup. > > > > > > Best regards, > > > Pieter Harder > > > > > > ________________________________________ > > > Van: Linux on 390 Port [[email protected]] namens Tom > Burkholder [ > > > [email protected]] > > > Verzonden: dinsdag 1 juni 2010 21:19 > > > Aan: [email protected] > > > Onderwerp: z/VM and z/OS sharing OSAs? > > > > > > z/VMers, > > > > > > My disclaimer is I'm not a networking engineer but I have a zVM and > > > networking question. > > > > > > I can provide more details, etc, but is anybody running z/VM and > z/OS > > lpars > > > on the same z10 and "SHR"ing the OSAs? We originally setup the > z/VM > > > proof-of-concept with VSWITCH but a single OSA to a CISCO switch. > Other > > > than a potential single point of failure, no problem, things work > well. > > We > > > have no spare OSAs (and would rather not purchase) but on the same > z10 we > > > have a test z/OS lpar with two (2) OSAs being used connected to two > other > > > CISCO switches (interconnected to each other for z/OS, but not to > the > > > current CISCO switch with the VSWITCH). > > > > > > If anybody is sharing OSA's with z/VM and z/OS lpars I'd be > interested in > > > getting some more information or ideas if possible. One of my > biggest > > > concern is being able to keep the same 192.168.xxx.yyy currently > being > > used > > > by z/VM on the single OSA onto the other OSAs/Switches if possible. > > > > > > Kind of a high-level diagram of what we got: > > > zVMa lpar chpid 09 -------- CISCO switch XXXXXX using > 192.168.xxx.yyy > > > addresses. > > > zOSa lpar chpid 05 ------- CISCO switch ZZZZZ-a\ > > > zOSa lpar chpid 08 -------- CISCO switch ZZZZZ-b/ > > > > > > I'd like to SHR chpids 05/08, not screw up existing zOSa, be able > to > > > configure z/VM with the same 192.168.xxx.yyy addresses and update > > > VSWITCH/controllers to use active/standby on chipds 05/08 (and free > up > > chpid > > > 09 OSA). > > > > > > I found the following pdf to be a good source, but I need some > more > > > information or help from the network side (e.g. can we share and > keep the > > > same 192.168.xxx.yyy subnet) > > > http://linuxvm.org/present/misc/vswitch.pdf > > > > > > > > > Thanks in advance for any help, assistance, or ideas, > > > Tom Burkholder > > > > > > Brabant Water N.V. > > > Postbus 1068 > > > 5200 BC 's-Hertogenbosch > > > http://www.brabantwater.nl > > > Handelsregister: 16005077 > > > > > > ------------------------------------------------------------------- > --- > > > For LINUX-390 subscribe / signoff / archive access instructions, > > > send email to [email protected] with the message: INFO LINUX- > 390 or > > > visit > > > http://www.marist.edu/htbin/wlvindex?LINUX-390 > > > > > > > > > > > -- > > Mark Pace > > Mainline Information Systems > > 1700 Summit Lake Drive > > Tallahassee, FL. 32317 > > > > --------------------------------------------------------------------- > - > > For LINUX-390 subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO LINUX-390 > or > > visit > > http://www.marist.edu/htbin/wlvindex?LINUX-390 > > > > --------------------------------------------------------------------- > - > > For LINUX-390 subscribe / signoff / archive access instructions, > > send email to [email protected] with the message: INFO LINUX-390 > or > > visit > > http://www.marist.edu/htbin/wlvindex?LINUX-390 > > > > > > -- > Mark Pace > Mainline Information Systems > 1700 Summit Lake Drive > Tallahassee, FL. 32317 > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO LINUX-390 > or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
