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The BITS Peer-Caching: Peer Discovery Protocol is used to locate networked hosts or devices that are implementing the server role of the BITS Peer-Caching: Content Retrieval Protocol. The BITS Peer-Caching: Peer Discovery Protocol provides a way for peer servers to announce their presence to connected subnets and a way for peer clients to locate servers in connected subnets.
The BITS Peer-Caching: Peer Discovery Protocol is a specialization of Web Services Dynamic Discovery (WS-Discovery), as specified in [WS-Discovery], and follows its model for announcing and locating resources. The protocol defines a client role and a server role. A server announces its presence to connected IP subnets via a multicasted Hello message to UDP port 3702. A client discovers servers passively by listening for Hello messages. A client can also solicit for servers by multicasting a Probe message to the same UDP port; servers with matching characteristics reply to the client with unicast Probe-Match messages.
Windows uses the BITS Peer-Caching: Peer Discovery Protocol to implement a distributed peer-to-peer cache of URL content for use by the Background Intelligent Transfer Service (BITS) component. For more information about BITS, see [MSDN-BITS].