Concept Guide

Figure 73 Bonjour Services and AirGroup Architecture
For a list of supported Bonjour services, see AirGroup Services on page 283.
DLNA UPnP Support
In addition to the mDNS protocol, W-IAPs now support Universal Plug and Play (UPnP), and DLNA-enabled
devices. DLNA is a network standard derived from UPnP, which enables devices to discover the services
available in a network. DLNA also provides the ability to share data between the Windows or Android-based
multimedia devices. All the features and policies applicable to mDNS are extended to DLNA to ensure full
interoperability between compliant devices.
In a UPnP-based scenario, the following types of devices are available in a network:
l Controlled devices (servers)
l Control points (clients)
When a controlled device joins a network and acquires IP address, it multicasts a number of discovery
messages for advertising itself, its embedded devices, and services. On the other hand, when a control point
joins a network, it may multicast a search discovery message for finding interesting devices and services. The
devices listening on the multicast address respond if they match the search criteria in the search message.
In a single W-IAP network, the W-IAP maintains a cache table containing the list of discovered services in the
network. The W-IAP also enforces native policies such as disallowing roles and VLANs and the policies defined
on ClearPass Policy Manager to determine the devices or services that are allowed and can be discovered in the
network. Whenever a search request comes, the W-IAP looks up its cache table and filters the cached data,
based on configured policies, then builds a search response, and unicasts it to the requesting device.
In a W-IAP cluster, the W-IAPs maintain a list of associated UPnP devices and allow the discovery of the
associated devices.
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