[DNA] Route vs Advertise

[Sathya Narayanan <sathya@research.panasonic.com>]

Erik -

It was my understanding that, a host can choose a prefix advertised by
R1 for its address configuration and use R2 as the default router
through which it sends is packets; i.e. advertising a prefix doesn't
mean the router is the only one that can route it.

In SEND, 3971, section 7.3:

Constrained

      If the network operator wants to constrain which routers are
      allowed to route particular subnet prefixes, routers should be
      configured with certificates having subnet prefixes listed in the
      prefix extension.  These routers SHOULD advertise the subnet
      prefixes that they are certified to route, or a subset thereof.

....

   Nodes SHOULD use one of the certified subnet prefixes for stateless
   autoconfiguration.  If none of the advertised subnet prefixes match,
   the host SHOULD use a different advertising router as its default
   router, if one is available.


This text seems to imply that routers advertising a prefix means they
are the ones allowed to route it.
Am I missing something?

thanks,
Sathya