设备支持批量删除VLAN和单个删除VLAN两种方式：
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单个删除VLAN10
<HUAWEI> system-view [HUAWEI] undo vlan 10
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批量删除VLAN10到VLAN20
<HUAWEI> system-view [HUAWEI] undo vlan batch 10 to 20
[Huawei-GigabitEthernet0/0/5]undo port trunk allow-pass vlan 2 3 //删除trunk链路
[Huawei-GigabitEthernet0/0/1]undo port default vlan //删除Access链路
[Huawei-GigabitEthernet0/0/2]undo port default vlan
[Huawei]undo interface Vlanif 2 //删除Vlan 接口
[Huawei]undo vlan 2 //删除创建的vlan
[Huawei]undo interface Vlanif 3
[Huawei]undo vlan 3
[Huawei]display vlan //查看vlan配置信息
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