关键词: 网络监测, 多协议标签交换, 流量工程, 隧道, 开放式最短路径优先, CSPF

Abstract: The available network management approaches are not able to monitor Multi-protocol Label Switch (MPLS) Traffic Engineering (TE) tunnels dynamically in real-time. To address this problem, a real-time monitoring approach for MPLS TE tunnels, called MPLS TE Tunnels Real-time Monitoring (MTRM), was proposed in this paper. A probe was placed in the network to collect Open Shortest Path First-TE (OSPF-TE) signaling messages passively. Based on the collected information, a MPLS network model was built and tunnel paths were dynamically computed using the tunnel paths real-time monitoring algorithm. The MPLS TE tunnel paths could thus be monitored in real-time. The simulation experiments were carried out on a MPLS network with 15 nodes. The results show that the proposed approach can monitor the changes of MPLS TE tunnels within five seconds, with precision over 90%. This real-time monitoring approach can greatly reduce the difficulties of MPLS network management and TE implementation, and it has a wide application prospect.

Key words: network monitoring, Multi-protocol Label Switch (MPLS), Traffic Engineering (TE), tunnel, Open Shortest Path First (OSPF), Constraint-based SPF (CSPF)