拓扑一  结果:NO

默认auto(被动)模式

Switch>show interfaces fastEthernet / switchPort
Name: Fa0/
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: (default)
Trunking Native Mode VLAN: (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: -
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false

Switch>show interfaces trunk

Switch>

 

拓扑二   结果:YES

修改2端主动模式(desirable)

Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode dynamic desirable Switch(config-if)#
%LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to down %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up

Switch#show interfaces trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 desirable n-802.1q trunking 1

Port Vlans allowed on trunk

Fa0/1 1-1005

Port Vlans allowed and active in management domain

Fa0/1 1

Port Vlans in spanning tree forwarding state and not pruned

Fa0/1 1

拓扑三  结果:YES

修改一端主动模式(desirable)

Switch>en
Switch#conf t Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode dynamic desirable %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to down %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up

Switch#show interfaces trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 desirable n-802.1q trunking 1

Port Vlans allowed on trunk

Fa0/1 1-1005

Port Vlans allowed and active in management domain

Fa0/1 1

Port Vlans in spanning tree forwarding state and not pruned

Fa0/1 1

拓扑四 结果:YES

修改一端 trunk

Switch>en
Switch#conf
Configuring from terminal, memory, or network [terminal]? conf t
?Must be "terminal", "memory" or "network"
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode trunk Switch(config-if)#
%LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to down %LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up Switch#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/ on .1q trunking Port Vlans allowed on trunk
Fa0/ - Port Vlans allowed and active in management domain
Fa0/ Port Vlans in spanning tree forwarding state and not pruned
Fa0/

默认auto,修改desirable

Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode dynamic desirable Switch(config-if)#
%LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up Switch(config-if)#end
Switch#
%SYS--CONFIG_I: Configured from console by console Switch#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/ desirable n-.1q trunking Port Vlans allowed on trunk
Fa0/ - Port Vlans allowed and active in management domain
Fa0/ Port Vlans in spanning tree forwarding state and not

拓扑五  结果:NO

修改一端 access

Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode access Switch(config-if)#end %SYS--CONFIG_I: Configured from console by console
s
% Ambiguous command: "s" Switch#show interfaces trunk

默认auto,修改desirable

Switch>en
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z. Switch(config)#interface fastEthernet / Switch(config-if)#switchport mode dynamic desirable Switch(config-if)#
%LINEPROTO--UPDOWN: Line protocol on Interface FastEthernet0/, changed state to up Switch(config-if)#end
Switch#
%SYS--CONFIG_I: Configured from console by console Switch#show interfaces trunk

拓扑六  结果:YES

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