Bidirectional Forwarding Detection (BFD) rapidly detects forwarding-path failures between network devices. When a single-hop BFD session enters the Down state, troubleshooting should focus on connectivity, session configuration, and BFD packet exchanges.
Checking the local and remote discriminators helps identify configuration mismatches that prevent session establishment. Examining BFD packet statistics helps determine whether control packets are being transmitted and received. Ping testing can identify basic IP connectivity problems.
However, checking whether a static route bound to BFD remains in the routing table is not necessary to diagnose why the BFD session went Down. The route may have been withdrawn as a consequence of the BFD failure.
Therefore, the appropriate answer is C. Huawei ' s BFD troubleshooting procedures prioritize session configuration, packet statistics, and link connectivity.
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