Router IP Traffic Export
Router IP Traffic Export (RITE), or simply IP Traffic Export, is a method of copying traffic directly from a router to an external device, such as a Protocol Analyzer or an Intrusion Detection System (IDS). This feature can be used to replace SPAN/RSPAN configurations deployed on L2 ports/VLANs. Two main benefits of RITE is, first, the ability to duplicate the traffic received on a WAN interface, such as Serial port, and second, granularity of our configuration – we can be very selective in what traffic will finally get copied from the network.
Before we discuss the configuration of RITE, just few words about limitations of this feature :
- The device receiving the exported traffic must be in the same L2 network as the router’s interface (e.g. must be directly connected). This interface is known as “outgoing” in the RITE’s terminology
- This (outgoing) interface must be an Ethernet port. Incoming interface(s) (where the traffic is received and optionally sent through) can be anything (e.g. WAN/LAN)
- Traffic generated by the router configured for RITE cannot be exported
A sample topology for RITE may look like one below. Our monitoring station (PC) is directly connected to R2’s RITE outgoing interface, Gig0/0 Continue reading
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