25 GbE ports typically support 25 Gbps, 10 Gbps, and 1 Gbps operational speeds. Auto-Negotiation support varies depending on the pluggable type and speed.
For more information, see Default Auto-Negotiation Behavior.
Forward Error Correction (FEC) is a negotiated port attribute for 25 GbE connections that support Auto-Negotiation. For more information, see Forward Error Correction.