It has relation with the system agreement that how we establish momentarily an IP multicast tunnel mechanism in WAN which does not support IP multicast mechanisms.

在一个不支持IP组播机制的广域骨干网中，如何随时建立一个IP组播隧道机制。它与体系协议有关。

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IP multicast group key management is essential for the IP multicast security.

IP多播组密钥管理问题是IP多播安全的核心问题。

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IP multicast technique realizes efficient data transmission from one point to multiple points in IP network, and remedies the defects of unicast and broadcast communication.

IP组播技术实现了IP网络中点到多点的高效数据传输， 它能弥补单播通信和广播通信的不足。

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