> On 10 May 2019, at 06:27, Doug Barton <[email protected]> wrote:
>
> It's been a while since I was configuring subnets, and last time I did the
> guidance was always no more than 1,000 hosts per subnet/vlan. A lot of that
> was IPv4 thinking regarding broadcast domains, but generally speaking we kept
> to it for dual stacked networks, equating an IPv4 /22 with an IPv6 /64. (This
> was commonly in office environments where we used a subnet per floor to
> accommodate all of the desktops, printers, phones, tablets, etc.)
>
> Is this still how people roll nowadays? Have switches and/or other network
> gear advanced to the point where subnets larger than 1k hosts are workable?
> In IPv4 or IPv6? I've done quite a bit of web searching, and can't find
> anything newer than 2014 that has any kind of intelligent discussion of this
> topic.
In the department of "this is how we should have done it".
I would make the subnets match the physical topology. That is a set of
(virtual) point to point links.
That gives one host and one router per link. Which results in a broadcast
domain of 2. I wouldn't bother with a shared on-link prefix on the link. Just
give the host a set of single addresses. Then you don't have to deal with any
of the pesky ND issues, DAD, address resolution and so on.
Best regards,
Ole
