Re: [RAM] Incremental Deployment of LISP

[Eliot Lear <lear at cisco.com>]

Hi Ross,
> How is a router supposed to know which packets are using an
> address that is available in the global BGP top-level routing table
> (such as a PA address), and which packets are using an address
> that needs to be mapped?

I guess the way I would tackle this problem is by first attempting to 
find a mapping.  Failing that I would fall back on the global routing 
table as it is today.  To me this says, "Assume things are the way they 
are today (baseline) unless told differently".  That's safe.   Remember 
when BGP4 was deployed.  CIDR was out there first.  Well, here we would 
have this table populated first (except for test cases).  There are two 
prices for doing it this way:

   * A mandatory extra lookup in an additional table
   * Wide distribution of the mapping table through some as of yet
     undetermined means.  This thing will need to be MORE reliable and
     scale more broadly than the root servers.

Given this, I don't think it matters where the address space comes from.

Eliot

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