![]() Although theĮxact extent of a local scope is site-dependent, locally scoped regions must not span any The local scope is the minimal enclosing scope and is not further divisible. IPv4 local scope-This scope comprises addresses in the range 239.255.0.0/16. The IP version 6 (IPv6) addressing architecture described in RFC 1884, IP Version The structure of the IPv4 administratively scoped multicast space is based loosely on The administratively scoped IP version 4 (IPv4) multicast address space is the range Administratively scoped multicast addresses are locally assigned,Īnd hence are not required to be unique across administrative boundaries. Packets addressed to administratively scoped multicast addresses do not cross configuredĪdministrative boundaries. However, TTL scoping has proven difficult to implement reliably,Īnd the resulting schemes often are complex and difficult to understand.Īdministratively scoped IP multicast provides clearer and simpler semantics for multicast IP multicast implementations can achieve some level of scoping by using the time-to-live Scoping can relieve stress on scarce resources, such as bandwidth, and improve privacy or Multicast group join messages that are sent upstream toward a source and data forwarding downstream. Multicast scoping controls the propagation of multicast messages-both
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