If you are getting a full AutoSupport from your nodes, I believe the data you want is in the cdb-net-port.xml and cdb-net-vifs.xml files. If you're looking for LIF information, it's in the network-interface.xml file.
Note that AutoSupport is sent on a per-node basis, not cluster. So each node will only report it's own data, and all of them together equates to the cluster.
Andrew
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