• Journal of KIISE:Computing Practices and Letters
• /
• v.8 no.6
• /
• pp.727-735
• /
• 2002

In this paper, we design and implement a MPLS based IP-VPN service module as an application for ACE2000 MPLS system. ACE2000 MPLS VPN service module has been developed using the BGP4 extension protocol. The IP-VPN service module supports differentiated QoS using the MPLS traffic engineering. In addition, it offers a path protection mechanism and the restart mechanism of MPLS system and forwarding engine for supporting a highly reliable service.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10e
• /
• pp.82-84
• /
• 2002

MPLS 시스템은 크게 기존 라우터 장치를 기반으로 하는 프레임 모드 MPLS 방식과 ATM 교환기를 기반으로 하는 셀 모드 MPLS 방식이 존재하며, 이들 두 가지 방식의MPLS 시스템은 서로 독립적인 MPLS 망으로 구축되며 운용된다. MPLS 망의 확장성, 운용성 및 경제성을 확보할 수 있도록 서로 다른 방식의 MPLS 시스템을 혼합하여 망을 구축하여 운용하기 위해서는 두 가지 방식의 MPLS 시스템 사이에 연동 기능이 요구된다. 따라서 본 논문에서는 frame-mode MPLS 방식과 cell-mode MPLS 방식간 연동을 위한 연동구조 및 작 방법을 제안하였다.

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

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.04a
• /
• pp.436-438
• /
• 2004

인터넷 서비스에 QoS(Quality of Service)를 제공하면서 IP(Internet Protocol)의 유연성과 확장성을 제공하기 위해 IETF에서는 MPLS(Multiple Protocol Label Switching)기술을 표준화하였다. 또한, MPLS기술의 기본이 되는 시그널링 프로토콜로 LDP(Label Distribution Protocol), CR-LDP(Constrained based LDP). RSVP-TE(Resource Reservation Protocol-Traffic Engineering)의 표준화를 진행해 왔다. 따라서 본 논문에서는 MPLS 기술을 적용하여 현재의 IP망에서 보다 안정적이고 차별화된 서비스를 제공하기 위해 리눅스 상에서 구연한 라우터기반 MPLS 시스템을 제시한다. 본 논문에서 제시하는 라우터 기반 MPLS 시스템은 기존 IP망과의 연동을 위해 MPLS 도메인상의 OSPF데몬을 수정하며, MPLS망에서 명시적 경로를 제어하기 위해 MPLS데몬을 수정한다. 그리고 MPLS데몬과 OSPF데몬은 수정된 Zebra데몬에 의해 스트림 형태로 정보를 교환한다.

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

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

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

• 한국정보통신설비학회:학술대회논문집
• /
• 2003.08a
• /
• pp.112-114
• /
• 2003

MPLS/VPN서비스는 MPLS망의 인프라를 이용하여 사설망을 제공하는 서비스로 각 VPN사이트사이를 고속의 LSP를 이용하여 연결한다. MPLS/VPN서비스는 차별적인 다양한 서비스 품질을 지원하는 것이 용이하며, 또한 서비스 도입과 운용 및 관리가 용이하여 저비용으로 VPN서비스를 제공할 수 있는 장점을 가지고 있다. 본 논문에서는 초고속 국가망에 도입될 예정인 ATM/MPLS MSR40시스템을 이용하여 MPLS/VPN망을 구축하기 위해 요구되는 라우팅 프로토콜상에서의 설정 및 고려사항을 설명한다. 현재 시험서비스중인 MPLS네트워크 구축 사례를 바탕으로 하여 MPLS 도메인 내부 라우팅 설정 절차 및 가입자측 라우팅 설정 절차에 대해 설명하고 또한 MPLS망의 특성상 요구되는 몇가지 라우팅 이슈에 대해 설명한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2007.10a
• /
• pp.58-62
• /
• 2007

Recnetly, the demands of QoS(Quality of Service) and the traffic in network is increased. So, H-MPLS(Hierarchical MPLS) network research what guarantees the scalability is in progress. But, the H-MPLS has a problem of increasing of groups and the links of these group's nodes. It happens a problem that is increasing of H-MPLS setup cost. In this paper, We setup the H-MPLS groups. We use NS simulator in order to analyze the performance and traffic transfer times of each H-MPLS groups. In conclusion, we can find out the elevation of the traffic performance, by increasing a amount of links.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.04a
• /
• pp.686-691
• /
• 2000

최근 들어 인터넷의 사용이 급격히 증가함에 따라 인터넷의 백본망에는 패킷 전달의 고속성, 확장성 뿐만 아니라 QOS 보장을 요구하게 되었다. 효과적인 인터넷 백본망을 구현하기 위해 본 논문에서는 Multi-Protocol Label Switching(MPLS)를 고려하고 MPLS 에서 인터넷 Quality Of Service(QOS) 서비스 모델 중 백본망에 적합한 Differentiated Service(DS) 모델을 그대로 제공하기 위해 MPLS 와 DS 의 연동에 대한 문제를 다룬다. 우선 MPLS 에서 QOS 제공을 위한 기능요소를 정성적으로 분석한다. 그리고 두 DS 망 가운데 ATM 기반의 MPLS 망을 두고 있는 경우를 가정하여, 종단대 종단간 DS 제공을 위하여 DS 망과 MPLS 망에서의 시그널링 과정을 제안한다. 즉, DS 의 BB 로부터 SLA 를 위한 신호를 MPLS 의 입구 라우터에서 해석하여 DS Type-Length-Value(TLV)를 만들고 이를 이용하여 Constraint-based Label Distribution Protocol(CR-LDP) 시그널링을 통해 마다 Label-Only-Inferred-PSC LSP(L-LSP)를 설립하여 MPLS 에서 DS QOS 를 그대로 제공한다. 또한 입구 DS BB 로부터의 정보를 MPLS 망을 통해 BB 에게 보낸다.