Abstract
This paper provides a tutorial for topology arregation in large hierarchical communication networks. Specifically, it examines some issues of topology aggregation for hierarchical PNNI Routing in ATM networks, presents a complex node representation, and provides some guidelines for topology aggregation. There are two main reasons for topology aggregation. First, topology information must be compressed to avoid excessive complexity in topology adevertisement. Second, the internal topology of a network may have to be hidden for security reasons. A desirable topology aggregation method must adequately represent the topology of a given network for efficient routing and netowrk resource allocation, using a compact advertised topology.
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