Is a /48 still the smallest thing you can route independently?
mysidia at gmail.com
Thu Oct 11 23:11:50 UTC 2012
On 10/11/12, William Herrin <bill at herrin.us> wrote:
> On Thu, Oct 11, 2012 at 6:06 PM, Randy Carpenter <rcarpen at network1.net>
> wrote: >> How many sites do you have? If less than 192, /44 is
>> perfect, unless some of those sites require more than
>> a /48. Then, it gets more complicated :-)
> We're having a general math breakdown today. First Jeroen wants to fit
> 5 /48's in a /47 and now you want to fit 192 /48's in a /44.
> 48-44=4. 2^4=16.
Right, last I checked the smallest integer >= Log base 2 of 5
is not less than or equal to 1, therefore, you will never fit 5
/48s in the network just by subtracting 1 from the prefix length.
if you want a prefix /yy that will accommodate a certain number
N of /xx
Then you must ensure that
2^(xx - yy) >= N
5^(xx -yy ) >= N
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