Ethernet – Collisions
Interfaces operate at half-duplex when connected to a shared ethernet segment (collision domain).
When an inteface in half-duplex mode is receiving a frame, it may buffer a frame being transmitted at the same time. This will be displayed as a deferred frame when looking at the interface statistics.
Auto speed/duplex negotiation is the default, to deactivate it you can manually set speed/duplex. Speed must be set before duplex otherwise an error is displayed.
If auto-negotiation is disabled on one end, the Cisco switch will default to half duplex for 10/100M, and full duplex for 1G.
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Technical Notes 