From what I can understand it seems like there is still some information missing from what you have provided about the situation. It would be helpful to know what the configurations are your trunks are as well as your vtp domains and modes. I would s...
conf tint fa0/4switchportendwr memsho int fa0/4 trunk ? once switchport is enable it should appear. if int is set to 'no switchport' then trunk will not be in cmd list for interface
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