Comprehensive and Detailed Explanation From Exact Extract:
If interfaces on a node show an “unknown” status, the recommended solution is to delete and rediscover the node. This ensures all current interface information, OIDs, and properties are correctly detected and polled, resolving mismatch or missing data that can cause an “unknown” status.
[Reference:, , "If interfaces remain in 'unknown' state, delete and rediscover the node to update interface mappings and ensure proper status polling.", — (Network Performance Monitor Administrator Guide, Interface Troubleshooting section), , ===========, ]
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