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Example Node A detects a problem in the network Path Node A Node B Recovery attempt: Node A tries connectivity test with Node B replies. Node A [and Node B] might test connectivity of other paths as well. Node A decides that switching the preferred address to A2 is useful. Initiator Responder R A1 B1 A2 B2 Connectivity Test Peer Address Set (A) Preferred Address (A2) DPD failure |