Greenfield IPv4 + IPv6 broadband deployment
swmike at swm.pp.se
Sun Feb 27 06:36:59 CET 2011
On Sun, 27 Feb 2011, Martin Millnert wrote:
> 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.)
16k might be enough, I've seen chassis switches which support 1-4k for a
whole blade or even in a whole chassis.
> 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.
One need to consider the CPU usage of all this ND traffic as well. I've
seen CPU-related ARP issues on some generally high-end platforms (routers)
at 10k ARP entries.
> 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.
Absolutely. Security and fault-isolation is much much easier.
Mikael Abrahamsson email: swmike at swm.pp.se
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