RE: draft-wbeebee-ipv6-cpe-router-04 comments

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

CableLabs has decided in the eRouter specification (one particular
instantiation of the CPE Router) that cable providers will never use the
unnumbered model.  Therefore, for the eRouter (which will only
ever be used in a cable network), the unnumbered model is not required.

However, DSL/3GPP networks will likely use the unnumbered model.

If a CPE Router can be used in both networks (like a standalone CPE
Router), then you'll need to 
support both - because you can't be certain who will be using your
router.

Therefore, you'll need to support both unless you have linktype-specific
knowledge that allows you to rule one out.

- Wes

-----Original Message-----
From: owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On
Behalf Of Fred Baker (fred)
Sent: Monday, March 23, 2009 5:47 PM
To: james woodyatt
Cc: IPv6 Operations
Subject: Re: draft-wbeebee-ipv6-cpe-router-04 comments


On Mar 23, 2009, at 10:58 AM, james woodyatt wrote:

> p2. If I were running an ISP, I'd be very suspicious of this 
> requirement on CPE router vendors that they MUST support "at least one

> of two" and not both WAN interface models.  Fortunately, I'm on the 
> other side of that fence, so I'm very pleased to see that I can refuse

> to support the Unnumbered Model and still comply with Best Current 
> Practice.

That wasn't how I interpreted it. It said that you need to support both,
as some ISPs will go one way and some the other.