• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1279-1282
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• 2001

최근 인터넷의 급속한 사용 증가로 인해 전송 링크의 광대역 지원과 멀티미디어 트래픽의 QoS 보장 문제, 향상된 IP 서비스의 제공 문제 해결은 필수적이다. MPLS 기술은 IP의 유연성과 확장성을 제공할 수 있는 패러다임의 하나이다. MPLS 망의 경계에 위치하는 LER 은 링크 계층 뿐만 아니라 IP 계층에서도 패킷을 전달해야 한다. 본 논문에서는 하드웨어 포워딩 엔진을 갖는 MPLS LER에서, 패킷 필터링 기능을 지원하기 위해서 포워딩 엔진을 제어하기 위한 기법에 대해서 기술한다. 이러한 패킷 필터링 기능은 MPLS LER에 firewall 기능을 제공하는데 응용될 수 있다.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.303-306
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• 2000

In this paper, we propose VC merge capable hardware architecture for scalability based on ATM switching fabric. We implemented a scheduler for configuring crossbars in input-queued switches which support virtual output queues at the input ports. Also, we implemented VC merge capable scheduler at the output ports. We verified the proposed model by using C language, and designed with VHDL language. Then, we simulated and synthesized it with software of the SYNOPSYS corporation.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.5
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• pp.365-374
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• 2004

This paper proposes the architecture of Intermediate System to Intermediate System routing protocol. IS-IS is a link state routing protocol designed to provide routing in a network layer protocols with datagram services. IS-IS has favored scalability and stability. So, it is important to support IS-IS for the MPLS system used in backbone networks. Especially, IS-IS must provide network state information and available resource information for supporting qualify of services in MPLS network. Therefore, we propose the design architecture of IS-IS routing protocol and the implementation technologies. Also, we propose extended architecture for traffic engineering in ATM based MPLS system.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.89-92
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• 1999

This paper describes on the threats such as IP spoofing, denial of service, and ILMI based attack etc. for IP over ATM network. Especially we discuss on the threats due to ATM characteristics that are VC stealing, multiparty and multi-connection call. Also we investigate on the threats of ATM based MPLS network. Finally we discuss and suggest the various solutions of ATM security.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1301-1304
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• 2002

통신 환경이 변하면서, 기존의 서비스에 따라 크게 음성망과 패킷망으로 구분되던 망 구조가 하나의 통합된 망에서 모든 서비스를 제공하는 구조로 진화하고 있다. 그리고, 이러한 서비스를 가능하게 하는 기술로서 VoIP(Voice over IP)가 최근까지도 계속 각광받고 있다. 그러나, 많은 노력에도 불구하고, 음성서비스와 같은 실시간 서비스의 엄격한 품질 요구조건을 보장하는 문제 때문에 VoIP 기술의 실제 적용이 지연되고 있다. 이에 본 논문에서는 통합망의 패킷 전달망을 ACE2000 MPLS 시스템 기반의 MPLS 망으로 구축함으로써 음성서비스의 품질을 보장하는 망 구조를 제시하고자 한다. 아울러 TE Server를 이용해서, 음성호를 전달하는 ER-LSP(Explicit Routed Label Switched Path)를 설정하는 호 설정 절차를 제시하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.7
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• pp.1-11
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• 2002

This paper proposes that an efficient routing entry sending method between routing controller FE. based on this method, we organize IP VPN support method based on MPLS network and design MPLS-VPN service control module, MPLS-VPN processing, VPN group configuration and LSP setup processing. We evaluate the performance about the VPN based on proposed MPLS, at the result of evaluation. We figure out that based on proposed IPC method, lost packets number reduces and delay increases more slowly in case of VPN based on MPLS comparing with the VPN based on ATM which has rapid delay increasement. Therefore we confirm that the VPN based on MPLS has high speed of packet processing and high utilization of buffers through the performance evaluation.

• Journal of the Institute of Convergence Signal Processing
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• v.8 no.1
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• pp.51-57
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• 2007

In this paper we introduce the concept of MPLS-based VPN and propose a scheme for providing VPN services in MPLS networks. Furthermore, we design the control components and the operational procedures and evaluated the performance of traditional VPN implementation methods and MPLS-based VPN. In this scheme it is possible to solve several problems that IP-based VPN pertains via the allocation of VPN ID and virtual space without tunneling, thereby providing effective VPN services. In other words, the MPLS-based VPN scheme uses MPLS networking technology together with the PSTN which can achieve a perfect segregation of user traffic on per-customer basis in a physical link and can guarantee high reliability and security levels. Specially, in the perspective of customers, it can save networking facilities installation and maintenance costs considerably. On the contrary, it possesses some shortcomings in that its deployment tends to be restricted within an ISP's network boundary and it is vulnerable to external security break-ins when going through public networks such as the Internet due to its lack of data encryption capability.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.4B
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• pp.298-305
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• 2003

In this paper, we proposed a high performance lookup controller for IP packet forwarding engine of ATM based label edge routers. The lookup controller is designed to provide services such as MPLS, VPN, ELL, and RT services as well as the best effort. For high speed searching for IP addresses, we employed a TCAM based hardware search device not using traditional algorithmic approaches. We also implement lookup control functions into FPGA for fast processing of packet header and lookup control. The proposed lookup controller is designed to support differenciated services for users and to process in pipelined mechanism for performance improvement. A two-step search scheme is also applied to perform lookup for the key combined with multi-field of packet header. We found that the proposed lookup controller provides the performance of about 16M packets per second through simulations.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.11C
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• pp.1171-1177
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• 2002

In this paper, we proposed a high speed IP(Internet Protocol) packet forwarding engine of ATM(Asynchronous Transfer Mode) based label edge routers for POS(Packet over SONET) interface. The forwarding engine uses TCAM(Ternary Content Addressable Memory) for high performance lookup processing of the packet received from POS interface. We have accomplished high speed IP packet forwarding in hardware by implementing the functions of high speed IP header Processing and lookup control into FPGA(Field Programmable Gate Array). The proposed forwarding engine has the functions of label edge routers as the lookup controller supports MPLS(Multiprotocol Label Switching) packet processing functionality.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.145-148
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• 2003

MPLS is one of the most important technics for the growth of the next generation network. MPLS is a kind of third layers switching technics which is combined with second layers switching speed and third layers routing ability. And a simple label switching paradigm which uses short and fired lengths of lables is available in MPLS, too. Like this way, MPLS not only can keep its competitive price but also keep its merits such as second layers speed, third layers expansion, and compatibility with existing protocols. That means the traffic engineering, VPN, QoS ran be supported easily in MPLS. In this thesis, therefore, we will implement a small inter-networking based on MPLS and analyze its performance.