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BFD-based MPLS network fault recovery technology research and implementation

Author: ZhouBangLan
Tutor: HuaXin
School: Southwest Jiaotong University
Course: Applied Computer Technology
Keywords: Label Distribution Protocol Fast Reroute Resuming BFD Recovery
CLC: TP393.0
Type: Master's thesis
Year: 2008
Downloads: 160
Quote: 8
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Abstract

As traffic on the Internet's rapid growth, diversification of network applications, the traditional best-effort IP networks to provide services can not meet the needs of real-time business hosting. How to ensure that the network when a fault occurs the continuity and quality of service (QoS), to maintain a high level of service availability, the transmission network can automatically detect failures and recover from failures become an urgent problem to be solved. As the future backbone of the core technology, Multi-Protocol Label Switching (MPLS) technology through the label switching mechanism can not only provide more effective than traditional IP QoS guarantees and traffic engineering, but also has a strong network survivability. MPLS network capable node or link failure, without human intervention, you can automatically restore the affected business, the entire network to maintain robustness and efficiency. MPLS network fault recovery techniques from fault detection and fault recovery technologies technical aspects to ensure the availability and stability of the MPLS network. Currently based on IP routing protocols recovery mechanisms need at least a few seconds to a few minutes, this will lead to a large number of packets lost, resulting in serious quality of service issues, and network performance degradation. Traditional IP network for real-time applications (such as voice) for accurate fault detection capacity is limited and does not have the second following intermittent fault repair. With the proliferation of VoIP applications, fast network fault detection and repair become increasingly necessary. MPLS network fault recovery technology after a failure, the IP layer to provide a faster response than time, you can quickly detect network failures and to recover from a failure to maintain the continuity of the network services. In this paper, MPLS network fault detection technology in-depth research, the use of Bidirectional Forwarding Detection BFD as MPLS network fault detection techniques, detailed design and implementation of MPLS BFD technology, and MPLS BFD technology for multi-core network equipment to enable MPLS network failure detection Time in milliseconds, greatly reducing the MPLS fault recovery failure detection time. MPLS network failure is detected, the need to have a better solution for fault recovery. Currently two more well-known program has Makam MPLS fault scheme, Haskin program. Makam program has the advantage of almost no packet reordering problem, but there is packet loss and the guard time longer shortcomings. Haskin program provides fast path switch, but when the fault is cleared on the working path, the path of the flow from the backup switch back to the original working path, packet reordering a more serious problem. Therefore, how to design a new fault recovery program, making fast failure recovery, message is not lost, and packet reordering does not occur is still the focus of current research. In this paper, the existing failure recovery program based on the research, we propose a new recovery plan - BFD-based recovery program, the new program using local recovery mechanism, establish a backup path, when a fault occurs quickly switches traffic to backup path, reducing the flow switching and packet loss caused by packet delay. For packet disorder problem, the program presents a new solution - use disorder realization of flow control tags sequentially controlled to avoid the traffic caused by packet switching disorder. After networking test, the new scheme has a faster fault recovery speed, packet loss, packet disorder phenomenon has significantly improved results.

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