I noticed gradually increasing input errors for a FastEthernet interface which is connected to an end-user Windows PC. The default setting for all interfaces is no-negotiate. The Foundry switch will use 100Mbps/Full if no-negotiate is configured.
The odd thing is that if I enable autonegotiation, the increasing input errors will stop occurring.
Is there any reason for this, and would there be a way to resolve the issue if I wish to configure the interface to use no-negotiate.