In this paper, we propose a protocol for supporting mobile End Systems (ESs) ihat move within an area in ConnectionLess-mode Network Protocol (CLNP) environment. Trafic caused by control Protocol Data Units (PDUs) under fiequeni ES migration can be reduced by separating the roles of Intermediate Systems (ISs); 1) generating and propagating the information ofthe default location of an ES, 2) communicating directly to the ES and notifying the IS performing the role 1) of the current loctztion of the ES. In addition, ISs may use a new caching mechanism for efficiency. This protocol has the following advantages: First, there is no need for mobile ESs t o be changed. Second, ISs implementing this protocol can coexist with the conventional ISs. Third, it does not require any change to the areas which do not have mobile ESs, hence it is easy to apply it to the existing networks.
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