Figure 2: An example scenario of host mobility with ILNP using network layer (IP layer) soft-handoff. A mobile node (MN) at uses identifier and locator at access router AR1. As the MN moves from cell 1 to cell 2, in the overlap region , it can use both its current locator, , and a new locator value, , that is provided by AR2 in cell 2. (The new locator value is identical to an IPv6 routing prefix, as can be discovered from IPv6 Router Advertisement (RA) messages.) In the overlap region, MN is multihomed. When MN moves into cell 2 completely , it uses only . As does not change, end-to-end state invariance can be preserved for transport protocols, maintaining end-to-end integrity.