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A NEW ARCHITECTURE FOR SPARSE-MODE INTER- DOMAIN MULTICASTING

Multicast routing, especially in the inter-domain case, is a complex problem involving many aspects such as scalability, routing policies, access control, and robustness. We propose a new multicasting architecture based on several features. A new level of addressing called logical addressing. It allows on the one hand providing an efficient multicast service for multihomed hosts and mobiles, and on the other hand to construct reduced bi-directional trees consisting of logical edges or tunnels connecting nodes playing an active role in the tree. Also a group manager controls tree membership and multicast trees are constructed from root to leaves contrary to most current solutions. After reviewing requirements for inter-domain multicast routing, we show how this architecture may help to solve some problems of inter-domain multicast routing, in terms of policy, scalability, and robustness.