Having seen those mails, I still don't know exactly if z900 OSA Express can support both layer2 and layer3 on the same port....
Wich mode will be used if the zLinux guest use the dedicated osa devices in stead of vswitch? Maybe z900 is too old.... Anson Y. ________________________________ 发件人： Alan Altmark <[email protected]> 收件人： [email protected] 已发送： 2009/9/22(周二), 下午9:12:17 主 题： Re: 回复： Does OSA Express2 Ethernet su pport zVM layer2 On Tuesday, 09/22/2009 at 08:10 EDT, [email protected] wrote: > I saw this post and would like to get some verification on running both layer 2 > and layer 3 on the same OSA. Yes, you can run both and they can even talk to each other. In the distant past, layer 2 and layer 3 could co-exist, but they couldn't talk to each other, creating a problem if they were in the same subnet. That was fixed a long time ago (z990?). > So we can now have say a z/VM running Linux guest on a layer 2 to an OSA along > with a layer 3 TCP stack on the same z/VM using the same OSA? Yes. Note that z/VM 5.4 TCP/IP now supports layer 2. > Would we be able to also have other LPARS either z/VM or z/OS share this same > OSA with layer 3 as well ? Yes. > From my understanding you had to have OSPF to share the OSA?s with other LPARS > ( mainly with the z/OS ) Not true. If you are sharing and the OSA is plugged into an access (as opposed to trunk) port on the switch, then everyone is in the same LAN segment and therefore the same subnet. z/VM has the VSWITCH to supply the needed OSA redundancy. z/OS has OSA failover (takeover), but no one seems to use it, depending on OSPF instead to handle the outage. Alan Altmark z/VM Development IBM Endicott ___________________________________________________________ 好玩贺卡等你发，邮箱贺卡全新上线！ http://card.mail.cn.yahoo.com/
