理解 Cisco ACL Vlan 的 in 和 out

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An access-list applied outbound to a vlan interface filters traffic going TO machines on that vlan.
An access-list applied inbound to a vlan filters traffic coming FROM machines on that vlan.

 参考：
https://community.cisco.com/t5/switching/acl-direction-when-applied-to-a-vlan-on-a-switch/td-p/1423652