Re: I-D Action:draft-ietf-v6ops-ipv6-cpe-router-03.txt

[Brian E Carpenter <brian.e.carpenter@gmail.com>]

On 2010-01-10 04:16, Mikael Abrahamsson wrote:
> On Sat, 9 Jan 2010, Mark Smith wrote:
> 
>>> Why can't a CPE router send unicast RAs to other CPE
>>> routers as long as they are not malicious and do not
>>> in any way conflict with the RAs sent by SP routers?
>>
>> I think on some networks that could have multicast traffic volume
>> related scaling issues. It's quite possible to build single Ethernet
>> link layers using DSL that have 100s or 1000s of CPE attached. It also
>> seems a bit redundant to have the CPEs fully aware of all their
>> neighbours' downstream prefixes, yet be unlikely to use those routes
>> very often.
> 
> I think no ISP will ever build a network that allows for local routing
> like that (at least not intentionally). So far ISPs do not want
> customers to talk L2 directly with each other, but instead want to do
> the routing between customers (mostly for security reasons). I therefore
> think it's a moot point to try to drive any standard that by a lot of
> security measures tries to solve this in the CPE. It just won't be
> deployed because of its complexity.

Especially since the amount of such local traffic seems likely to
be tiny, and therefore not worth optimising. Does anyone have any
actual data on this?

     Brian