To begin with, the switch will give lesser priority to mirrored traffic. CPU overhead for copying and mirroring a single packet is negligible, but those expenses mount up over time. As a result, each mirrored packet is given less priority than normal network traffic by the switch.Another drawback of port mirroring is that it consumes resources on both real and virtual machines. These can be expensive in terms of both hardware and software license. Therefore, in most circumstances, port mirroring may be implemented only at certain places within the network.

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