enhanced anchor description

The following is an attempt to describe anchor (for dmm) for discussion.

Different proposed dmm solutions have used anchor.

The functions of an anchor common to these solutions are:
(1) advertise prefix/address of the MN
(2) allocate prefix/address of the MN

The functions used in some proposed dmm solutions but are not common to all of them are:
(1) packets to/from the MN traverse through.
Note: with multiple anchors using anycast address, a packet may or may not traverse any one of the anchors.
Note: with route optimization in the host-based MIP, the packet does not traverse the anchor any more. Yet the anchor does perform the above functions.
(2) indirection, e.g., tunneling
(3) information, e.g., binding HoA and CoA
(4) sends route update, e.g., using BGP

Methods to provide mobility support using anchor:
(1) indirection
(2) update routing tables
...

H Anthony Chan

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