Hi Robert,

> While perhaps pretty obvious, it would be good to also highlight what 
> implementation should do in the event of covering prefix changes in the LSDB 
> if those are to happen after registrations have already gone out. Maybe as 
> simple as de-register and re-register for the new covering prefix ? 


Ok, how about:

          If the ABR has registered for a prefix and that prefix is no
          longer advertised by another ABR then an ABR MAY unregister,
          re-evaluate its registration and register for a different
          prefix. In this way, if a summary prefix changes, the ABR
          can shift to the new summary prefix.

Tony

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