CPE router learning DNS servers - comment on draft-ietf-v6ops-ipv6-cpe-router-03

["Dan Wing" <dwing@cisco.com>]

1. I noticed draft-ietf-v6ops-ipv6-cpe-router does not reference RFC5505,
"Principles of Internet Host Configuration".  Is that intentional?


2. http://tools.ietf.org/html/rfc5505#page-11 says, in part:

   ...
   In IPv6, where link-layer-independent mechanisms such as stateless
   autoconfiguration [RFC4862] and stateless DHCPv6 [RFC3736] are
   available, PPP IPv6CP [RFC5072] configures an Interface-Identifier
   that is similar to a Media Access Control (MAC) address.  This
   enables PPP IPv6CP to avoid duplicating DHCPv6 functionality.
   ...

and I see that draft-ietf-v6ops-ipv6-cpe-router-03 only says:

   L-6:   The IPv6 CE router MUST support a DHCP server [RFC3315] on its
          LAN interfaces.  It MAY support Stateless Dynamic Host
                              ^^^
          Configuration Protocol (DHCP) Service for IPv6 [RFC3736].


Why is that only a MAY?  I mean, without the CE doing DHCPv6 towards 
the Service Provider's network, is there some other way the CE router 
learns the IPv6 network's DNS servers so it can propagate those 
DNS servers to hosts connecting to the CE router?  (I hope the answer 
is not 'manual configuration').

-d