6500 ,IP load balancing, VIPA OS/390

Unanswered Question
Feb 13th, 2002
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I have a HOST with OS/390 and three OSA Fastethernet

and I have define a VIPA. These Three OSA are conected to a 6500 (three differen ports).

VIPA is a Virtual IP Adrres, that I can reach through any OSA adapter.


How can I do if I wanted to balance IP traffic from

6500 to HOST?. Now all my IP traffic is getting

into the host only through one OSA adapter.

Thanks in advance.


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ciscomoderator Fri, 02/22/2002 - 16:15
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Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen


If anyone else in the forum has some advice, please reply to this thread.


Thank you for posting.


skoretsk Sun, 02/24/2002 - 09:51
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Hi Miguel,

What routing protocols are you using (host/network)? The OSPF OMPROUTE server in z/OS CS IP makes use of advanced OSPF V2 techniques for improving availability and performance. For example, it can balance the connection load among up to four alternative routes if the costs of the routes are equal (equal cost multipath). It can also interact with VIPA, whether using RIP or OSPF, to ensure that an IP route is always available to host applications as long as at least one interface to the network is active.

There's also a MULTIPATH keyword in the IPCONFIG parameters of the TCPIP profile that allows enables multipath selection for outbound traffic.

I also suggest you look at the following links for more info regarding the above:


OSPF IBM OSA-E and Cisco 6500 Interoperability:

http://www1.ibm.com/servers/eserver/zseries/networking/pdf/ospf_design.pdf


Networking with z/OS and Cisco Routers: An Interoperability Guide:

http://www.redbooks.ibm.com/redpieces/pdfs/sg246297.pdf





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