I too think that default settings for the port is half duplex. Because once I change the duplex to full on the 1900 switch connected to router ethernet , router sees a syslog message as duplex mismatch and late collisions begin to increase.
I have left it to default of Half duplex, cleared the counters , still the problem persists.
Can the problem be with the ethernet cable or AUI Connector?
One syslog message says : %LANCE-3-UNDERFLO: Unit 0, underflow error
Cisco Doc Explanation:
The Ethernet hardware is requesting data faster than the system can supply it. This should never happen unless a serious malfunction has occurred.
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