Aggregation Layer

This layer contains multilayer switches that perform an aggregation function connecting server farms that span multiple access switches. The aggregation layer also contains devices that provide services to all the server farms such as firewalls, load balancers, SSL terminations, IDS/IPS, etc.

Some engineers have lately recommended to reduce latency by removing this layer and replacing access switches with 10G models connected directly to the core switches. This may become more common as 10G prices drop.

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