Nested MIP for IP Mobility Management

Document Type Expired Internet-Draft (individual)
Author Alan O'Neill 
Last updated 2002-05-09
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Regional Registration provides a mechanism for MIPv4 to localise registrations. The Mobile Node (MN) initially registers to the HA via the Gateway Foreign Agent (GFA) so that the HA can learn the GFA Care of Address (CoA). The MN can then subsequently use a Regional Registration to maintain the binding in the GFA as the MN moves and changes its Foreign Agent (FA) CoA or Collocated CoA (CCoA). It can continue to do so whilst a MN remains under the GFA through which the MN sent the Home Registration. The GFA performs CoA switching between the GFA CoA and that used by the MN (CCoA or FA CoA). Whilst the regional registration provides localisation, it does not at the same time provide registration aggregation for MNs employing multiple HoAs. The ability to concurrently support multiple MN addresses from arbitrary addressing domains is a 3GPP commercial and technical requirement and therefore of interest to operators seeking to move to an all-IP solution based on MIP. In addition, the GFA is a very stateful element in the core of the Internet that cannot be bypassed on failure through routing updates. This draft describes a complementary, less stateful model for localisation that in addition supports aggregation both for regional-like registration and hand-offs. The model re-uses as much as possible from the home registration signalling model of [RegTun] but requires a new form of aggregated regional registration.


Alan O'Neill (

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