For the management console to gain visibility into an N-Tier application, you must mirror host conversations between each tier to a monitoring device. To start this process, run mirroring commands to the Ethernet switch on which the servers and the monitoring device are connected. The mirror commands cause the packets to and from the various hosts to be copied to the monitoring device. This copy function has minimal performance impact on the switch.
If the multi-tier application is virtualized, consider mirroring the server-to-server traffic to the virtual switch on the ESX host, and mirroring the front-end server traffic to a physical monitor.
The following figure depicts switch port mirroring.
In complex environments with more than two servers, you might need to mirror several ports to capture all tiers of an application architecture. Carefully select the ports to mirror in this environment to avoid capturing the same conversation twice.
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