멀티프로토콜 레이블 스위칭(MPLS) 패러다임에서, 패킷에 전향 등치 클래스(FEC)가 할당되고 나면 이후 라우터들에서는 헤더에 대한 분석을 수행하지 않고 레이블로써 모든 포워딩이 가능하기 때문에 기존의 전통적인 방식인 네트워크 레이어에서 행해지는 포워딩 방식에 비해 많은 이점을 갖는다. 이러한 레이블 에지 라우터인 MPLS LER은 MPLS 도메인의 경계에 위치하여 인입(ingress) 또는 출구(egress) 라우터로서 동작하여 기존 인터넷과의 접속을 이루어 낸다. 즉, MPLS 인입 라우터로 동작할 경우 인터넷에서 MPLS망으로 접수되는 패킷 헤더를 분석하여 입력 패킷에 해당 레이블 값을 할당하여 MPLS 영역내 연결할 다음 라우터로 함께 전송하는 기능을 수행하며, 출구 라우터로 동작할 경우에는 이와 동일하나 역순의 기능을 수행한다. 본 논문에서는 이러한 기능 수행을 위해 제시한 MPLS LER 시스템의 트래픽 성능을 큐잉 모델 및 시물레이션을 통해 분석하고 IP 패킷처리 용량을 추정한다. 제안 시스템에 대한 분석결과 최대 IP 패킷처리 용량이 초당 42만-46만 패킷으로 추정됨을 보인다.
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