RE: I-D Action:draft-ietf-v6ops-ipv6-cpe-router-02.txt

["Wes Beebee (wbeebee)" <wbeebee@cisco.com>]

> Thank you for the clarification.  Correct me if I am wrong, but in my
understanding, for router
> discovery and SLAAC the node must  accept/process RAs and must discard
received RSes.  This means 
> "acting as a host", but is there a technical reason to always set
R-bit in NAs zero?  A CE router
> has a moment of transition from a  host to a router (after
provisioning, for example) and vice
> versa as  viewed from the PE router, so making R-bit depend on whether
IP  forwarding is enabled
> or not still seems reasonable to me.

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> When the router is attached to the WAN interface link it must act as 
> an IPv6 host for the purposes of Neighbor Discovery[RFC4861] and IPv6 
> Stateless Address Autoconfiguration[RFC4862].  The router acts as a
requesting router for the purposes of DHCP prefix delegation
([RFC3633]).

And, obviously, the router routes traffic out the WAN interface and does
NOT use the Conceptual Sending Algorithm of Neighbor Discovery to do so,
but rather a proper routing table.  The LAN interface acts as a router
when sending RA's, but both the WAN and LAN act as a host when the
router is being configured (e.g. with SNMP/HTTP).  The LAN port acts as
a router for the purposes of IPv6 SLAAC even though the WAN port acts as
a host.

So, as you can see, a CPE Router is both a router and a host on its WAN
interface.

- Wes