The need of a reflector port is caused by a hardware design limitation in the Cat 3550 switches. The ASICs are assigned to physical ports and within the 3560 switch they are assigned to the chassis.
The traffic from the port you want to monitor has to be copied somewhere and the 3550 does that to the reflector port. So you can take any free port on the switch for this, you can't use that port for anyhing else when the monitor session is enabled on it.
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