> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Hoesly, Bret > Sent: Thursday, August 31, 2006 9:49 AM > To: [email protected] > Subject: outbound TCP/IP question > > > Hello, > > We have 3 OSA ports (IP's) defined in our TCP/IP stack on our > z890. We > recently converted our print center to TCP/IP printing. What we have > noticed is only the first port (IP) defined in the stack is being > utilized for outbound TCP/IP traffic. Is there a setting > within TCP/IP > that we are not aware of that is limiting the use to the one > port (IP)? > We really expected to see all 3 being utilized.
Look at IPCONFIG MULTIPATH. The default is NOMULTIPATH > > Our main concern is if the first port has a hardware problem > will TCPIP > use one of the other 2 ports (IP's) or will we have an outage to deal > with? Yes, you will automatically use one of the other OSA cards. In fact, we had this happen. We have two active OSA cards, only using one port on each card. When one of the OSA cards failed, the other OSA card automatically did an "ARP takeover" (or something like that). That is, every session that was going to the failed card transparently went over to the other OSA card. Neat! The surviving OSA card even responded to the other OSA card's IP address for pings and session establishment. When the first OSA card was fixed, we just did a VARY command to get the I/O addresses back ONLINE to z/OS, then a TCPIP START command to restart the device. At this point, the second OSA stopped doing the "ARP takeover" and traffic again, transparently without any outage, went back to the first OSA card. This was truly wonderful and surprised the holy <elided> out of the Windows networking people. They thought the entire z/OS system would fail or at least TCPIP. When everything "just kept working", they were stunned and disbelieving. Even so, they still thing Windows is superior to z/OS in every way, manner, and form. <sigh> You can't even rub their noses in it to any effect. > > Any help with this would be greatly appreciated. > > Thank you, > Bret Hoesly -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
