![]() ![]() Replicate packets for each downstream branch, not only do looping packets not arrive at aĭestination, but each pass around the loop multiplies the number of looping packets, eventually Routing loops must be avoided in IP multicast networks. The methods differ somewhat in their requirements and result in different output from YouĬannot combine the two methods (the commit operation fails for a configuration that includesīoth). That specifies the interfaces and configures the address range as a series of filters. You can configure multicast scoping either by creating a named scope associated withĪ set of routing device interfaces and an address range, or by referencing a scope policy Link-local scope, which is 224.0.0.0/24, and the static global scope allocations, which containĪll scoping is inherently bidirectional in the sense that join messages and data forwardingĪre controlled in both directions on the scoped interface. Two other scope classes already exist in IPv4 multicast space: the statically assigned The space from which an organization allocates subranges when defining scopes for private ![]() IPv4 organization local scope-This scope comprises 239.192.0.0/14. If scope regions overlap in an area, the area of overlap must be within the local scope. Other scope boundary and must be contained completely within or be equal to any larger scope. 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 You use multicast scoping to limit multicast traffic by configuring it to an administrativelyĭefined topological region. ![]()
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