Any device connected to a port set as a reflector port loses connectivity until the RSPAN source session is disabled. It forwards only the traffic from the RSPAN source session with which it is affiliated.
This reflector port is the mechanism that copies packets to an RSPAN VLAN. 
It is used exclusively to build an RSPAN session. This is a physical port that has to be set.
The traffic from the source interfaces on the start device is copied to the RSPAN VLAN through a reflector port. The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. On the switch that contains the destination port for the session, traffic from the RSPAN session VLAN is simply mirrored out the destination port. This VLAN is then trunked to other switches, allowing the RSPAN session traffic to be transported across multiple switches. RSPAN works by mirroring the traffic from the source ports of an RSPAN session onto a VLAN that is dedicated for the RSPAN session. This means that you can centralize your network capture devices. RSPAN extends SPAN by enabling monitoring of multiple switches across your network and allowing the analyzer port to be defined on a remote switch. Remote Switch Port Analyzer (RSPAN) is an extension of SPAN. A network analyzer connected to the monitoring port processes the data packets for diagnosing, debugging, and performance monitoring. This is commonly used for network appliances that require monitoring of network traffic, such as an intrusion-detection system. Port mirroring is used on a network device to send a copy of network packets seen on a single device port, multiple device ports, or an entire Virtual Local Area Network (VLAN) to a network monitoring connection on another port on the device. The network analyzer can be a Cisco SwitchProbe device or other Remote Monitoring (RMON) probe. 
Switch Port Analyzer (SPAN), or sometimes called port mirroring or port monitoring, chooses network traffic for analysis by a network analyzer. This article provides instructions on how you can configure RSPAN on your switches.
Analyze the Captured RSPAN VLAN Packets in WireShark. Configure Session Destinations on a Final Switch. Configure Session Sources on a Final Switch. Configure Session Destinations on a Start Switch. 
Configure Session Sources on a Start Switch.
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