![]() (A host may then invoke the services of other hosts to help process the request.) Upon receiving a request for a particular application, the load balancer forwards it to one of the hosts that handles the application. Such a load balancer is sometimes referred to as a “layer-4 switch” since it makes decisions based on the destination port number (layer 4) as well as destination IP address in the packet. Inside the data center, the external requests are first directed to a load balancer whose job it is to distribute requests to the hosts, balancing the load across the hosts as a function of their current load.Ī large data center will often have several load balancers, each one devoted to a set of specific cloud applications. ![]() To support requests from external clients, each application is associated with a publicly visible IP address to which clients send their requests and from which they receive responses. Load BalancingĪ cloud data center, such as a Google or Microsoft data center, provides many applications concurrently, such as search, email, and video applications. ![]() Some vendors foresee higher-layer switches that examine layer 5, 6, or 7 information to provide more control over prioritizing application traffic, but this might be just vendor hype.
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