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This paper describes the performance of variable topology routing protocol in comparison with a theoretical minimum routing overhead, which is the amount of information needed to describe the changes in a dynamic network topology. A network of identical but distinguishable nodes lies within a bounded region of space. There are two levels of hierarchy for nodes. All the nodes of a sub-region form a cluster and randomly select a cluster head from the nodes within the same sub-region. A cluster-head maintains two types of topology information: (i) Local cluster topology information, (ii) Global topology information.