What differences exist in the way APs discover an AC when going online on Layer 2 and Layer 3

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When APs go online on Layer 2 or Layer 3, the differences in the way the APs discover an AC are as follows:
- When going online on Layer 2, APs discover an AC by using broadcast.
- On Layer 3, APs can go online in Option 43 mode or DNS mode.
- In Option 43 mode, APs obtain their IP addresses and also the IP address of an AC, and then discover the AC by using unicast.
- In DNS mode, APs obtain their IP addresses and also the IP address of the DNS server and the AC domain name. Then, the APs send requests to the DNS server to parse the AC domain name. As a result, the APs obtain the IP address of the AC and discover the AC by using unicast.

Other related questions:
What are the differences in APs' Layer 2 and Layer 3 access to ACs
- In Layer 2 access mode, an AP broadcasts a probe frame to discover ACs. - In Layer 3 access mode, an AP discovers ACs using DHCP Option 43 or DNS. a) When Option 43 is used, an AP obtains an AC's IP address when the AP obtains its own IP address. Then

Configuring Layer 2/Layer 3 switchover on the firewall
Perform as follows to configure Layer 2/Layer 3 interface switching on the USG2000&5000&6000: system-view [USG] interface GigabitEthernet 1/0/1 [USG-GigabitEthernet1/0/1] undo portswitch //Switch the interface from Layer 2 mode to Layer 3 mode. [USG-GigabitEthernet1/0/1] portswitch //Switch the interface from Layer 3 to Layer 2. Note: 1. If the device interface attribute specifies that the interface is a Layer 2 interface, the interface cannot be switched to Layer 3 mode. This command applies only to interfaces that support Layer 2/Layer 3 switching. 2. When you use this command to perform Layer 2/Layer 3 mode switching, the interface can contain only the attribute information (such as shutdown and description configurations) so that the mode switching can take effect. If the interface already has service configurations (such as port link-type trunk), clear all these configurations of the interface and then run this command.

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