How do you fix Cisco auto negotiation problems?
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"Autonegotiation issues can result from nonconforming
implementation, hardware incapabilities, or software defects. When
NICs or vendor switches do not conform exactly to the IEEE
specification 802.3u, problems can result. Hardware incompatibility
and other issues can also exist as a result of vendor-specific
advanced features, such as autopolarity or cable integrity, which
are not described in IEEE 802.3u for 10/100 Mbps autonegotiation.
Generally, if both the NIC and the switch adhere to IEEE 802.3u
autonegotiation specifications and all additional features are
disabled, autonegotiation must properly negotiate speed and duplex,
and no operational issues exist. "