VLAN 是二层的概念,因此在进行路由(三层)的时候,数据帧头(vlan tag)已被剥离,在完成路由后,如果出接口是trunk类型,新的vlan tag(目标vlan的tag)会被添加到数据帧头再发出
参考:
https://community.cisco.com/t5/switching/what-happen-to-vlan-tag-info-when-passing-through-a-router/td-p/2250312
permit 允许 deny 拒绝 permit 匹配 deny 不匹配
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