Hello John, I have worked with the OSA cards since the OSA-1 to the latest OSA-E 10Gb, i have set some recovery scenarios that made a very easy way to set the cards fot take over:
1) VIPA (with or without OSPF or RIP) if you configure a VIPA in your environment all the Physicall interafces will be linked to the Virtual IP Address, in this case you can have 2 or more physicall interfaces but TCP/IP will use only the Primary interface defined in the TCP/IP profile (you can made use of the others but you need more definitions) when this primary interface fails, the next available interface becomes the primary interface, as your remote client is pointing to the VIPA the packets will continue to go to the VIPA, the take over function is provided by the routers in your network, if you have OSPF or RIP enabled the failling interface will be reported to the routers and the next available route will be used (in my experinece this is the easy and cheap way to have a take over scenario and better the TELNET sessions already in progress do not disconnect --- this is not true for FTP or socket connections). If you do not have any routing protocol enabled in the mainrame you can made use of static routes between your default router and the mainframe but between the default router and the rest of the network you need a routing protocol in place. 2) DNS, you can define in your DNS all the OSA ports with the same HOST NAME, also you will need a routing protocol as in the above step or static routes, as said TCP/IP will use the primary interface, when this interface fails the client connectiosn will continue to point to the same host name but in this case the name resolution will bring a diferent IP address, this options works just fine if you do not want to implement VIPA or OSPF in the mainframe and all the take over is done by the DNS and the routers. I have done both scenarios in the past several times, 2 monts ago i implement again the second option involving 4 osa ports and is working fine. For SNA: The simple way to set take over functions for an OSA card using SNA is to set the same MAC address for two OSA ports (if possible each port on diferent OSA cards) and connect each one to diferent RINGS or ETH segments, but be sure that the next ring or ETH segments are interconnected the when one of the cards fails you will not be aware until you check in the syslog or get a NetView alert about it, this takeover model works even better that the previous 2. Regards. ---------------------------------------------------------------------- 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
