中国教育和科研计算机网(CERNET)在全国主干节点上构建和实现了组播视频会议系统，成为全国教育网各节点的视频会议交流平台。

China Education and Research Network (CERNET) construct and realize the multicast based video conference system on CERNET backbone and make it the communication platform for CERNET nodes.

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在两个节点之间多条并行的流量主干上进行负载分配是一个十分重要的问题。

Load distribution across multiple parallel traffic trunks between two nodes is an important consideration.

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由于无线网络存在节点失效、链路断裂等特性，虚拟主干网需要具备一定的容错性。

Because of the inherent node (link) failures in wireless networks, virtual backbones should be fault-tolerant.

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