[AusNOG] Looks like the NBN will be a PON variant for sure...

[Rob Wise]

On Wed, Apr 29, 2009 at 4:25 PM, Matthew Moyle-Croft
<mmc at internode.com.au>wrote:

>
> On 29/04/2009, at 2:31 PM, Matthew Moyle-Croft wrote:
>
>
> However, a per-user VLAN might be nice too if the aggregation can be sorted
> out (imagine BIG vlan rewrite switches!).
>
>
> There are precedents for doing this - some countries moved to this model
> from ATM PVC per customer.
>
> However, it does strike me that a per vlan model would burn a /30 for each
> customer rather than a /32 - in a world where IPv4 addresses might become
> quite valuable for a time do you really want to increase a cost by four
> times just to get rid of PPPoE?
>

I can't speak for other vendors, but on Redback* you can use a common DHCP
pool with subscribers spread over multiple VLANs.

Another interesting issue that I have seen is where multiple CPEs have the
same MAC address ('cheap' CPEs in particular).  If the subscribers are in
individual VLANs you can handle it ok but if you have a common shared VLAN
it can cause some headaches :)

Cheers,

Rob

* Day job disclaimer, speaking for myself on this list.
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