Greenfield IPv4 + IPv6 broadband deployment
swmike at swm.pp.se
Sun Feb 27 01:30:22 CET 2011
On Sun, 27 Feb 2011, Adam Armstrong wrote:
> That's the plan currently. Purely layer 2 back a couple of very large devices
> doing layer 3 aggregation. Still deciding on 1:1 or 1:N VLANs.
I recommend against that. I'd do a lot more distributed L3 switch model,
let's say one L3 switch per 1000 subscribers or so.
If there was such a device, I'd do L3 switch that the customer connects to
directly, so you never ever need L2 backhaul and all that pain that comes
with it (duplicate MAC addresses, needing to handle q-in-q on the L3
I'd also require a CPE to do routing so your big devices never have to
handle all the customer devices and to ND etc with them. ND is very chatty
and it's a lot of state to keep, lot's of TCAM slots to handle etc. Do
link-local only to the customer and do DHCPv6-PD only, no DHCPv6/SLAAC at
all. If the customer doesn't have a CPE that does this then they won't get
IPv6, only IPv4+NAT.
> My primary issue at the moment is that I can't see a clean way to manage 100K
> static v6 prefixes via DHCP.
I'd say you need the equivalent of option 82 and a DB? I don't know how to
do this currently though.
Mikael Abrahamsson email: swmike at swm.pp.se
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