Binary Math (Part II) & IPv4 Prefix Summarization

Dear Scot\Petr,

I want to sincerely appreciate the the two blogs below where you both
dissected the subject of Summarization using different methods. I learnt
alot. They were great!

http://blog.ine.com/2008/11/03/binary-math-part-ii/

http://blog.ine.com/2010/03/17/a-simple-ipv4-prefix-summarization-procedure/

I decided to compare both methods to see if I will arrive at same result.
But please I need a little more light on the difference I noticed.

Looking at this example:
168.192.3.0/24
168.208.11.0/24
168.208.3.0/24
168.192.11.0/24

Using the Binary Method taught by Scot the result was
access-list 21 permit 168.192.3.0 0.16.8.0
access-list 21 permit 168.192.11.0 0.16.0.0

But using Prefix Summarization taught by Petr the result was
access-list 21 permit 168.192.3.0 0.32.16.0
access-list 21 permit 168.192.11.0 0.32.0.0

I am alittle-bit confused.
Please kindly clarify, are these results the same?

Which method should someone stick to? Do they have advantages over the
other?

Tannie

Blogs and organic groups at http://www.ccie.net
Received on Wed Mar 24 2010 - 10:45:40 ART