In one-arm and side-arm topologies, the Layer 7 device hangs off the network switch rather than being sandwiched between the router and switch (see "Armed and Ready," page 69). The main difference between the two topologies is the number of interfaces between the content networking device and the switch: One-arm topology uses a single interface; side-arm uses two.
So which topology do you use when? It depends on the amount of traffic passing through the switch. If the switch has heavy traffic, side-arm is best; otherwise, one-arm will suffice.
A word of caution: When your content-networking device is configured in proxy mode in a one-arm or a side-arm topology, you must reconfigure the default gateway on the servers to point to its IP address. But if the device is configured in transparent mode in this case, reconfiguration likely won't be necessary because the device automatically intercepts traffic destined for the specified ports and/or IP addresses.
Be More Direct
A key component of a Web services configuration is setting up how your Web servers get content to the client machine. There are two ways to configure this in a load balancer, the most common of which is to have the device provide the client access to the Web content. Another approach, called direct-return configuration, has the Web server ship the content to the client rather than having the load balancer or other content-aware device handle the task.
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