Back-to-Back Trunk Aggregation Configuration

Trunk aggregations support back-to-back configuration. Instead of using a switch, two systems are directly connected to run parallel aggregations, as shown in the following figure.

Figure 2-3  Back-to-Back Trunk Aggregation Configuration

The illustration shows trunk aggregation trunk0 on System A directly connected to trunk aggregation trunk0 on System B by means of the corresponding links between their respective underlying datalinks. This setup enables Systems A and B to provide redundancy, high availability, and high-speed communication between both systems. Each system also has net0 configured for traffic flow within the local network.

The most common application of a back-to-back trunk aggregation is the configuration of mirrored database servers in data centers. Both servers must be updated together and therefore require significant bandwidth, high-speed traffic flow, and reliability.