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This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

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Abstmct -This paper concentrates on tbe scalability aspects of mobility management, particularly mobility mtbin an Access Network ('micr*mobllity').It is argued that tbe normal classification of mobility protocols as tunnel-based or per hnst forwarding solutions is not useful from a scslability viewpoint.Tbree aspects of scalability are identified terminal, geographic and throughput. The paper argues that terminal scalability is not a major issue, given assumptions about address allocation, whilst geographical and throughput scalability require the suppofi of arbitrary topologies, and multiple gateways to the Access Network Four exemplar micromobility protocols are dscussed.