interface GigabitEthernet2/0/42  原先的为trunk，

port link-type trunk

port trunk allow-pass vlan 2 to 4094

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interface GigabitEthernet2/0/42 现在改为access

undo port trunk  allow-pass vlan  all

port trunk allow-pass vlan 1

port link-type access

port  default vlan 10