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switch#sh int type mod/no
this command displays default switch port configuration: check
administrative mode: dynamic auto
operational mode: dynamic auto
to correct this switch from dynamically negotiting its trunk use and its encapsulation mode issue the following commands
sw(config)#int type mod/no
sw(config-if)#switchport access vlan vlan-id
sw(config-if)#switchport mode access
two things you have achieved with this command
1. removed the switch port from the native vlan and put it in any unused vlan-id
2. chnaged the switchport mode from trunk to access mode
for vlan hopping
set native vlan to a bogus or unused vlan
prune the native vlan off both ends of the trunk.
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