Re: [lisp] Adding a "Distance Server" to the Map Resolver, to support scalable "anycast" and "disaster recovery"

[Scott Brim <swb at employees.org>]

Excerpts from Joel M. Halpern on Thu, Apr 23, 2009 03:00:20PM -0400:
> Anycast mapping entries (IDs, or whatever you want to call them) do
> not  have that mutability property.  If you are talking to an entity
> using  one entry mapped from an anycast, you can not expect to be
> able to  continue the conversation with a different mapped entry.

LISP is encapsulation not tunnels.  If RLOCs are anycast addresses,
then once a packet leaves an ITR, the packet is forwarded based on how
intermediate routers reach that anycast address.  The ITR doesn't
control switching between ETRs if it's given an anycast RLOC to send
to.