nanog mailing list archives
Re: Is a /48 still the smallest thing you can route independently?
From: Jimmy Hess <mysidia () gmail com>
Date: Thu, 11 Oct 2012 18:11:50 -0500
On 10/11/12, William Herrin <bill () herrin us> wrote:
On Thu, Oct 11, 2012 at 6:06 PM, Randy Carpenter <rcarpen () network1 net> wrote: >> How many sites do you have? If less than 192, /44 isperfect, 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 not 5^(xx -yy ) >= N
-Bill
-- -J
Current thread:
- Re: Is a /48 still the smallest thing you can route independently?, (continued)
- Re: Is a /48 still the smallest thing you can route independently? Måns Nilsson (Oct 13)
- Re: Is a /48 still the smallest thing you can route independently? Edward Dore (Oct 14)
- Re: Is a /48 still the smallest thing you can route independently? Scott Weeks (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Randy Carpenter (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Jo Rhett (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Randy Carpenter (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Justin M. Streiner (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? William Herrin (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Owen DeLong (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Randy Carpenter (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Jimmy Hess (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Randy Carpenter (Oct 11)
- Re: Is a /48 still the smallest thing you can route independently? Randy Carpenter (Oct 11)