When a route is reflected by a route reflector (RR) for the first time, the RR adds the Originator_ID to this route to identify the originating router. If the route contains an Originator_ID, the RR retains this Originator_ID. When another BGP client receives the route, it compares the Originator_ID of the route with the local router ID. If the two IDs are the same, the BGP client discards the route.

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