Greenfield IPv4 + IPv6 broadband deployment

Martin Millnert martin at
Sun Feb 27 06:32:56 CET 2011


On Sun, 2011-02-27 at 03:57 +0100, Mikael Abrahamsson wrote:
> If you're going to be the default gw of the /64, I think it's a good
> idea to enforce what number of IPv6 addresses and mac addresses you
> support in the service. Handling lots of ND is not going to scale, you
> really don't want to be part of the home network if you can avoid it.
> Think 50 devices which might have multiple IPv6 addresses each. That's
> a lot of ND and TCAM usage. 

On a relatively high-end 48p L3 access switch, I'm not sure I agree that
~16k ND entries are an insufficient amount for many, many years to come.
I'd be willing to make a bet with you that the device in question will
have been replaced long before the issue ever appeared. (I keep
customers habits of hooking up routers well in mind.)

You are certainly right that one should investigate the limits of the
equipment before deployment though, and I suspect that ND flood
protection etc is mandated as well on customer interfaces.

All things considered is this another reason why it is very beneficial
to go the route of connecting customers directly on L3 edge devices IMO.


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