From: Paul \(SESAMe\) (paul@xxxxxxxxxxxxxx)
Date: Sat Mar 23 2002 - 07:55:23 GMT-3
Hi All,
Can anyone have a look at my workings below and confirm or clarify that my
understanding of summarisation is correct.
Example 1:
10.10.10.0/24 Could be summarised as 10.10.10.0/23 With no
overlap
10.10.11.0/24 Only requires 1 bit therefore can start at any multiple
of 2.
Example 2:
10.10.8.0/24 Could be summarised as 10.10.8.0/22 With no
overlap
10.10.9.0/24 Requires 2 bits so can start at any multiple of 4
(this would exclude starting at 10.10.10.0(example 4) although it looks ok at
first)
10.10.10.0/24
10.10.11.0/24
------------------------------------------------------------------
However I don't think you can do the following:
Example 3:
10.10.9.0/24 Could not be summarised as 10.10.9.0/23 as this does not
fall on bit boundary
10.10.10.0/24
Example 4:
10.10.10.0/24 Could not be summarised as 10.10.10.0/22(example 5)
10.10.11.0/24
10.10.12.0/24 This would require a /21 see below (3 bits starting at
any multiple of 8) but would incorporate 4 other networks (example 6)
10.10.13.0/24
-----------------------------------------------------------------------------
------------------------------------------------
Example 5
10.10.8.0/24 Could be summarised as 10.10.8.0/22 With no overlap
10.10.9.0/24
10.10.10.0/24
10.10.11.0/24
-----------------------------------------------------------------------------
-------------------------------------------------------
Example 6
10.10.8.0/24 Could be summarised as 10.10.8.0/21 With no overlap
10.10.9.0/24
10.10.10.0/24
10.10.11.0/24
10.10.12.0/24
10.10.13.0/24
10.10.14.0/24
10.10.15.0/24
1. I don't think that you can ever start summarisation on an odd number.
2. You have to be careful that you do not break the bit boundaries otherwise
you will incorporates other networks.
Mail me back Ade and let me know if this is how you understand it?
Regards, Paul
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