Micromobility protocols like Cellular IP, Hawaii and Hierarchical Mobile IP (in this paper applied to a single IP domain), are developed to solve problems of handoff latency and control overhead of Mobile IP. Hereby, a tree access network topology is assumed. For reasons of robustness against link failures and load balancing, extra uplinks and mesh links in the topology are desired. This paper makes a classification of several topology types and investigates the influence of these structures on the performance of the protocols. While Cellular IP and Hierarchical Mobile IP do not take advantage of extra links, Hawaii uses the presence of meshes to reduce handoff latency and packet loss. However, this results in the use of suboptimal routes after several handovers.