The conversations so far on this topic have been great. I think however, we
need to take a step back for a moment and think through what the HOMENET
network looks like when serviced by a CPE Router. In my mind, we have a few
scenarios that are possible.
The first is a CPE ingress router to the home and no other routers. There may
be in this device multiple SSIDs and they each might need to have their own
address space and have separate firewall/filtering rules. In this case,
everything is contained in a single box and so no additional routing protocols
are needed. This has been defined in the CPE router (RFC 6204) and the bis
extension that is in draft right now.
The second case is a CPE ingress router with N routers behind it. In this
case, I humbly submit that anything where N is greater than 2 says medium sized
business maybe larger. I find it real hard to get any deeper than 2 routers in
series for a HOMENET class device deployment. Anything greater than that and
you likely would not use this class of device anyway. Sure there will be
situations where this is not true ,but I'll wager that in 90% of the
installations where a CPE router is providing the link to the world, this will
be the case. Even factoring in SmartGrid I just can't see a very deep network.
Is there a use case for more than 1 or 2 layers in a HOMENET deployment that
uses a CPE router as the connection to the world? To be clear here - this is
what I mean:
(sorry for the poor ASCII art here )
Provider Router -------- CPE router ----------Router ------
Router
Or
Provider
|
CPE Router
^
Router Router
| |
Router Router
I will acknowledge that in some business cases you might place a router on each
floor or each building in a campus, but this is where things get blurry for me
- would you really use a CPE router in these cases for ingress into the
business? You certainly could, but would you?
Given that, I think that defining how many routers exist behind this CPE
ingress router will provide us with a reasonable place from which to define the
needs and requirements for an IGP running in the home.
Dan
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