思科交换机有些版本的接口默认为dynamic auto ：Set trunking mode to dynamically negotiate access or trunk mode

思科交换机有些版本的接口默认为dynamic auto ：Set trunking mode to dynamically negotiate access or trunk mode

sw1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
sw1(config)#interface GigabitEthernet1/3
sw1(config-if)#switchport mode  ?
  access        Set trunking mode to ACCESS unconditionally
  dot1q-tunnel  set trunking mode to TUNNEL unconditionally
  dynamic       Set trunking mode to dynamically negotiate access or trunk mode
  private-vlan  Set private-vlan mode
  trunk         Set trunking mode to TRUNK unconditionally

sw1(config-if)#switchport mode  dynamic
sw1(config-if)#
sw1(config-if)#switchport mode  dynamic  ?
  auto       Set trunking mode dynamic negotiation parameter to AUTO
  desirable  Set trunking mode dynamic negotiation parameter to DESIRABLE
sw1(config-if)#switchport mode  dynamic  auto

VLAN、接口的链路类型 （列表、list、全）vlanlist、accesslist、trunklist、hybridlist
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