Excerpts from William Herrin on Thu, Mar 13, 2008 12:06:53PM -0400:
> Handover is the routing technology which enables mobility in a
> circuit-switched network. Circuit-switched networks are necessarily
> single-homed: your voice channel can only take one path at a time. The
> mobility routing challenge is amounts to this: how do I re-terminate
> the tail of my circuit from this base station (wireless tower) to that
> base station while minimizing bit errors on the circuit's continuous
> stream? We give this re-termination process the name "handover."
RFC3775 (mobility support in IPv6) says:
L2 handover
A process by which the mobile node changes from one link-layer
connection to another. For example, a change of wireless access
point is an L2 handover.
L3 handover
Subsequent to an L2 handover, a mobile node detects a change in
an on-link subnet prefix that would require a change in the
primary care-of address. For example, a change of access router
subsequent to a change of wireless access point typically
results in an L3 handover.
Essentially an L3 handover is an event that requires your IP address
to change.
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