Customer originally had a Cisco 2621XM whose Fast Ethernet Port was connected to a Catalyst 2950 and both ends set to 100/FDX and everything was working fine. Today customer replaced Cisco 2621XM to a Cisco 3825. When 3825 and 2950 are set to Auto the Link comes up OK and everything works fine. When set to 100/FDX at both ends the link stays down.
Customer is not happy even then. He wants the link to come up when 3825 Gi0/0 and 2950 port are both hard-coded for 100/FDX.