Layer 3 and Layer 4 Load Balancing
For Layer 3 and Layer 4 load balancing, the decision can be made on the first packet. It is because all the information (such as source and destination IP addresses and port numbers) required to make a load-balancing decision is available in the first packet. The first packet goes though the flow-setup path, and after the load-balancing decision is made and fast path is enabled for the flow, all subsequent packets are forwarded in the hardware using the shortcut. Figure 19-8 shows a Layer 3 and Layer 4 load-balancing flow in ACE:
Figure 19-8 Layer 3 and Layer 4 Load Balancing
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