How to configure an Ethernet interface to access the external network

Service interfaces fall into two types:
1. LAN interface (Layer 2 interface): is used by an AR to exchange data with network devices on a LAN.
2. WAN interface (Layer 3 interface): is used by an AR to exchange data with external network devices.
You can run the portswitch command to switch a Layer 2 interface to a Layer 3 interface, to implement data exchange with the external network.

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