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Transparent Proxy and ARM > Transparent interception strategies > Transparent interception with a Layer 4 switch
Transparent interception with a Layer 4 switch
Help | Content Gateway | Version 8.0.x
Layer 4 switches can redirect supported protocols to the proxy, while passing all other Internet traffic directly to its destination, as shown below for HTTP.
Layer 4 switches offer the following features, depending on the particular switch:
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A Layer 4 switch that can sense downed hosts on the network and redirect traffic adds reliability.
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If a single Layer 4 switch feeds several proxy servers, the switch handles load balancing among the Content Gateway nodes. Different switches might use different load-balancing methods, such as round-robin or hashing. If a node becomes unavailable, the switch redistributes the load. When the node returns to service, some switches return the node to its previous workload, so that the node cache need not be repopulated; this feature is called cache affinity.
 
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Note 
It is recommended that you do not enable Content Gateway virtual IP failover when a switch is providing load balancing in a cluster configuration.

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