• Journal of KIISE:Information Networking
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• v.28 no.4
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• pp.602-610
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• 2001

In the MPLS(Multiprotocol Label Switching) forwarding paradigm, once a packet is assigned to a FEC(Forwarding Equivalence Class), no further header analysis is done by subsequent routers; all forwarding is driven by the labels. This has a number of advantages over conventional network layer forwarding. The MPLS LER(Label Edge Router) is located at the boundary of MPLS domain and plays a role in connecting with the existing Internet as an ingress or an egress router. That is, the MPLS LER as an ingress router assigns a label to a packet which enters the MPLS network from the Internet by analyzing its header and forwards to a corresponding next router in MPLS domain. As an egress router, the MPLS LER turns the packets out of the MPLS network by performing the reverse operation. In this paper, we analyze the traffic performance of an MPLS LER system and estimate the IP(Internet Protocol) packet processing capacity of the system using queueing model and simulation. It is found that the maximum IP packet processing capacity of the system is estimated by 420,000 through 460,000 packets/sec.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1589-1592
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• 2005

VPN(Virtual Private Network)은 물리적인 장비나 회선을 논리적으로 구분하여 기존 전용회선을 기반으로 하는 사설 네트워크에 비해 상대적으로 적은 구축 비용, 융통성 있는 확장성, 저렴한 운용비용의 장점을 보유한 별도의 사설 네트워크를 구성하는 기술이다. 다양한 VPN 기술 중에서도 MPLS VPN 은 확장성, QoS 제공을 용이하게 해주는 장점을 가지고 있어 차세대 네트워크 기술로 부각되고 있다. 일반적으로 MPLS VPN 은 ISP 에서 제공하는 서비스로 인식되나 규모가 크고 다양한 사설 네트워크를 필요로 하는 기업의 네트워크 모델로도 적합하다. 또한 Virtual Router VPN 은 Customer Edge(CE) 장비로서 활용성이 큰 Switch 장비에 적용하여, CE 를 MPLS VPN 과 쉽게 연동하게 한다. 본 논문에서는 MPLS VPN 및 Virtual Router VPN 을 이용하여 기업 네트워크를 효과적으로 구성하는 방안을 기술한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.70-73
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• 2001

정보기술의 급속한 발달로 멀티미디어 및 인터넷 환경이 하산되어 사용자의 네트워크 대역폭 또한 증가하였다. 이런 환경에서 VPN은 공중망을 이용하여 사설망을 꾸미는 기술로 통신비용 및 관리비용을 줄이는 것을 목적으로 현재 사용되는 기술이다. VPN은 접속방법, 이용회선, 서비스 제공방식, 응용방식, 구현방법 등에 따라 여러 형태로 분류된다. 본 논문에서는 서비스 제공방식의 분류에서 네트워크기반의 VPN중 현재 제안되고 있는 두 방식인 Virtual Router구성 방식과 BGP/MPLS구성 방식을 비교분석 한다.

• Proceedings of the Korea Contents Association Conference
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• 2003.11a
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• pp.227-233
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• 2003

In paper, we present design and implementation of MPLS based VPN with QoS capabilities. We propose a design architecture of an edge router for MPLS based VPN with QoS capabilities in backbone network. We design functional blocks, interface specifications, detail routing and forwarding information based structure, and packet forwarding engine for the purpose of implementation of an edge router, We extend bgp-4 software for implementation differentiated service packet forwarding schemes in MPLS based VPN.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.4B
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• pp.339-350
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• 2003

The demands of network users emphasize the improvement and guarantee of service quality as well as the increment of bandwidth. As a result, high performance and additional new functions are important features to build network equipments, especially and edge router. For this structure, network processors with high performance and flexibility are considered as a main part of a packet forwarding module. In this paper, we design and edge MPLS router with a network processor, which supports high performance and multi-functionalities and examine its advantage and limitation.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.4
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• pp.447-454
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• 2003

The forwarding enging, which handles the incoming frames and forwards them to the appropriate outgoing interface, is the crucial factor of the router´s performance. As the MPLS label edge router provides the facility that it is capable of interworking with various kinds of networks, the forwarding engine should have the flexibility processing the corresponding types of frames from such network interfaces. In order to support the flexibility, we implement the forwarding engine for the MPLS LER with ATM interfaces based on the programmable Ethernet packet processor. By exploiting instinct loop-back functionality of Ethernet packet processor, our forwarding engine handles and forwards the frames from/to ATM interfaces. The performance of our forwarding engine is evaluated by experiments on the effect of looping frames back and the number of Ethernet packet processor´s instructions.

• Journal of KIISE:Information Networking
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• v.29 no.1
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• pp.31-39
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• 2002

The VPN(Virtual Private Network) is a private network constructed logically on a public network infrastructure. There have been numerous studies to support the VPN services by using different technologies such as IP in IP, GRE, L2TP, MPLS and so on. Among these technologies, MPLS has shown many merits in aspects of QoS, security, and management, compared with other technologies. As an enhancement of the VPN that is controlled by MPLS PE(Provider Edge) routers, this paper presents the VPN controlled by MPLS CE(Customer Edge) routers. The functional architecture of the CE based VPN and operations of the CE routers are described along with the performance comparison of CE based MPLS VPN. It has been shown that the CE based VPN has more advantages than PE based VPN with respect to independency, scalability, security, and complexity.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.37-40
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• 2000

Multi Protocol Label Switching (MPLS) is a high performance method for forwarding packets (frames) through a network. It enables routers at the edge of a network to apply simple labels to packets (frames). we use MPLS in the core network for internet. MPLS provide high speed switching and traffic engineering in MPLS domain but at the Label Edge Router(LER) there is frequently cell discarding via congestion and buffer management method. It is one of the most important reasons retransmission and congestion. In this paper we propose advanced LER scheme that provide less cell loss rate also efficient network infrastructure.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.1
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• pp.65-73
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• 2006

Network based VPN(Virtual Private Network) using MPLS(Multiprotocol Label Switching) technology, called PE(Provider Edge router) based MPLS VPN, is regarded as a good solution for intranets or ext3nets because of the low cost and the flexibility of the service provision. In this paper, we describe a mechanism that allows the VPN users to move from one site to another site of the VPN network based on the BGP-E MPLS technology. This mechanism is designed for PE(Provider Edge) routers of the backbone network. PE routers connected to the VPN sites establish a new MPLS path to the mobile node after they detect movement of the mobile VPN node. The new location may belong to the same VPN or to different VPN. We desisted VPN management and control functions of the PE routers in order to interface with the Mobile IP protocol and support the QoS mechanism. The pilot implementation and performance measurement were carried out on a simulation using COVERS tool.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10b
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• pp.1629-1632
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• 2000

인터넷 트래픽의 폭발적인 증가로 인해 라우터에서 목적지로 포워딩 해야 할 트래픽의 양도 함께 증가하게 되었다. 그와 같은 트래픽들 중에 최근에 급격히 증가하고 있는 음성트래픽의 주를 이루는 것이 바로 인터넷 전화로 발생되는 트래픽들이다. 본 논문에서는 인터넷 전화시 발생하는 음성트래픽의 특성에 대해 살펴보고, 라우터에서 트래픽 폭주시 이를 제어하는 큐잉 방식을 비교분석하고, MNS(MPLS Network Simulation)툴을 이용하여 코어망을 MPLS 네트워크로 구성한 후 UDP 음성트래픽을 생성하여 각 라우터(LSR: Label Switch Router)의 버퍼에서 요구되어지는 폭주제어기법들에 대해 시뮬레이션을 하여 그것을 통해 얻은 결과를 바탕으로 실제 인터넷 전화 시스템의 통화품질에 적절하게 대처할 수 있는 큐잉 기법을 고찰한다.