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When you mirror data from servers that support a multi-tier application architecture, collection devices send duplicate packets the monitoring applications. The servers in a multi-tier architecture send data back and forth among themselves. When a server with mirror port sees a packet in both transmit and receive directions, the packet is sent to the mirror port. Generally, include only front-end servers in the port mirroring configuration. Mirroring the middle-tier servers sends duplicate packets because both transmit and receive packets are mirrored.
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