Concept Guide

Figure 74 Bonjour Services and AirGroup Architecture
For a list of supported Bonjour services, see AirGroup Services on page 280.
DLNA UPnP Support
In addition to the mDNS protocol, W-IAPs now support Universal Plug and Play (UPnP) and DLNA (Digital Living
Network Alliance) 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 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 searching for 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 AP 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 CPPM to determine the devices or services that are allowed and can be discovered in the network.
Whenever a search request comes, the AP looks up its cache table and filters based on configured policies and
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.
The following figure illustrates DLNAUPnPServices and AirGroup Architecture.
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