On Jun 6, 2012, at 9:53 AM, Anton Smith wrote: > <snip>
> Hi all, > > Potentially silly question but, as Bill points out a LAN always occupies a > /64. > > Does this imply that we would have large L2 segments with a large > number of hosts on them? What about the age old discussion about > keeping broadcast segments small? > > Or, will it be that a /64 will only typically have a similar number of > hosts in it as say, a /23|4 in the IPv4 world? > > Cheers, > Anton Now you have deduced the beauty of the scheme. The number of end points does not matter to IPv6 address planning. Said another way - my factory subnet may have a gazillion(1) little machines on one subnet while my data center boxes may have several subnets. Just count the subnets. Let the traffic/technology drive the use per subnet whilst you TRILL(2) a pretty tune. Note (1) Gazillion < 2^64 Note (2) Thanks, Radia James R. Cutler james.cut...@consultant.com
