Looks like you wanted to have three different servers and monitor them through the same SNMP client. If that's right, you do not have to create three different DAS servers. You can have three different remote instances in a single domain managed by a DAS. For creating
three remote instances in the same domain please refer to the article above.
You can also refer to the following document for SNMP monitoring of clustered and stand-alone server instances-
http://docs.sun.com/app/docs/doc/820-7190/gifay?a=view
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