Identify the mission-critical applications and servers that you want to monitor. Then, target the switches where you want to configure port mirroring.
Review the current VLAN configuration for each switch. If servers of interest are all on the same VLAN, include the VLAN in mirror configuration, or VSPAN in a Cisco environment. Consider mirroring multiple VLANs to capture all the traffic you want to monitor. For each VLAN, consider how many hosts are included and the resulting collection and capture load. Also be aware of the possibility of packet duplication.
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