When operating at full-duplex, FCS, cyclic redundancy checks (CRC), alignment errors, and runt counters should be minimal. If the link is operating at full-duplex, the collision counter is not active. If the FCS, CRC, alignment, or runt counters are incrementing, check for a duplex mismatch. Duplex mismatch is a situation in which the switch is operating at full-duplex and the connected device is operating at half-duplex, or vice versa. The result of a duplex mismatch is extremely slow performance, intermittent connectivity issues, and loss of connection. Other possible causes of data link errors at full-duplex are bad cables, a faulty switch port, or software and/or hardware issues.
Full-duplex setting
- Published on Oct 5, 2026
- 1 minute(s) read
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