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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.
- When Option 43 is used, an AP obtains an AC's IP address when the AP obtains its own IP address. Then the AP sends a unicast probe frame to the AC to discover the AC.
- When DNS is used, an AP obtains its own IP address, the DNS server's IP address, and AC's domain name. Then the AP sends a domain name resolution request to the DNS server. After the DNS server resolves the AC's IP address based on the domain name, the AP can send a unicast packet to the AC to discover the AC.