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5505 FDDI connectivity to IBM mainframe


I have the following:

1-IBM mainframe:


- has two OSA cards (with FDDI ports)

- Each OSA has two IP address's one for TEST and one for Production

- The two OSA have different MAC address.(user defined MAC)

2- two Ciso 5505:


-Each switch has FDDI module

The old setup:


Before,I have 2 old hubs (not cisco) connecting to the two OSA through token ring,the mainframe OSAs are configured now for this setup.

The new setup (which I want to make)


to connect the two 5505 to the two OSA by FDDI ,in this case I'll get two dual ring ,one for each OSA.

I would like to know what is the correct connection between them?

Do I need to add additional configuration between the two OSA on the mainframe (since now I'll have Dual ring not single ring)?

please I need any information about this problem.


Re: 5505 FDDI connectivity to IBM mainframe

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 ( or speak with a TAC engineer. You can open a TAC case online at

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

Thank you for posting.

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