MPLS网络中的OAM机制

随着许多传统的基于电路交换的应用被放到基于包交换的IP／MPLS网络或者以太网上进行传输，包交换网络和电路交换网络之间的界限逐渐消失。为了提供和电路交换网络相同的QoS保证，包交换网络中也必须具备相同的OAM功能。首先对现有的基于IP的OAM功能做一介绍，然后就基于MPLS的包交换网络中如何提供OAM功能进行分析，最后讨论近期有关MPLS网络中OAM功能的一些建议。

OAM Mechanism in MPLS Networks

The boundaries between packet and circuit networks have long disappeared, with many traditional circuit-switched applications such as voice and video now being carried over packet-switched IP/MPLS or Ethemet networks. However, this tradition has happened so fast that many OAM functions supported by circuit-switched networks such as SONET/ SDH are still unmatched in packet networks. In order to match the quality sustained by circuitswitched networks, OAM functions must also be developed for such packet networks. In this paper, the writers first examine currently available IP-based OAM functions, then discuss issues in providing OAM features and capabilities for MPLS-based packet networks. In the end, this thesis focuses on recent proposals for MPLS networks, as well as issues in MPLS OAM yet to be addressed.