Manual

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Switch3(Config-If-Ethernet1/12)#exit
5.4 Port Troubleshooting
Here are some situations that frequently occurs in port configuration and the advised solutions:
 Two connected fiber interfaces won’t link up if one interface is set to auto-negotiation
but the other to forced speed/duplex. This is determined by IEEE 802.3.
 The following combinations are not recommended: enabling traffic control as well as
setting multicast limiting for the same port; setting broadcast, multicast and unknown
destination unicast control as well as port bandwidth limiting for the same port. If such
combinations are set, the port throughput may fall below the expected performance.