3.1.4.2.2 Multicast Cloud Discovery
To initiate multicast cloud discovery, PNRP MUST do the following:
Set CloudDiscoverySSDPTargetCount to zero.
If the Simple Service Discovery Protocol (SSDP) (as specified in [UPNPARCH1], section 1) is available, issue an SSDP M-SEARCH ([UPNPARCH1], section 1.2.2) for PNRP in the preferred cloud by using the following search target string in the search message.
"urn:Microsoft Windows Peer Name Resolution Protocol: V4:IPV6:<Scope>"
<Scope> MUST be replaced by either "Global", "SiteLocal", or "LinkLocal" (without the quotation marks).
Set SSDPResponseRequestIdentifier to the search target string used in the M-SEARCH.