It has relation with the system agreement that how we establish momentarily an IPmulticast tunnel mechanism in WAN which does not support IPmulticast 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。
2
IPmulticast group key management is essential for the IPmulticast security.
IP多播组密钥管理问题是IP多播安全的核心问题。
3
IPmulticast technique realizes efficient data transmission from one point to multiple points in IP network, and remedies the defects of unicast and broadcast communication.