H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 747)

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The AC can respond by searching the service-device mapping table next time when a client
queries the printing service.
Figure 755 Bonjour query snooping and response
Hotspot 2.0
Support for this feature depends on the device model. For more information, see " About the H3C Access
Controllers Web-Based Configuration Guide ."
Hotspot 2.0, developed based on 802.11u, implements automatic network discovery, automatic
authentication, and seamless roaming for wireless clients.
The AC supports the following functions in Hotspot 2.0:
• Automatic network discovery—The AC and clients exchange Hotspot 2.0 capabilities by using
active or passive scanning. If both of them support Hotspot 2.0, the clients can get external network
information by exchanging Generic Advertisement Service (GAS) frames with the AC before being
associated with an AP.
• Security—When the Downstream Group-Addressed Forwarding (DGAF) function is enabled for an
AP, the AP forwards all downstream wireless broadcast ARP packets and wireless multicast packets.
To prevent spoofing attacks by using downstream multicasts, you can disable the DGAF function for
the AP.
• Network management—Controls frame transmission between clients and the AC.