Router IP Traffic Export is used to export packets to a VLAN or LAN interface for analysis. The primary use for RITE is for IDS (Intrusion Detection Systems) implementations where duplicated traffic can indicate an attack on the network. In actual instances where identical traffic is received on multiple ports of a router, the router forwards those packets to an IDS for alerting and analysis…this is what RITE does.
When you setup RITE, you configure it to send packets to the predefined MAC address of the IDS server. You can setup forwarding of this traffic in, out, or both and you can filter on this using ACLs.