From: Ahmed Mamoor Amimi (mamoor@xxxxxxxx)
Date: Sat Mar 23 2002 - 10:35:04 GMT-3
how about this chart :
128 64 32 16 8 4
2 1
- 0 0 0 0 0
0 0 0
Summary | 1
<--- 8
8.0/23 | 1
1 <---- 9
8.0/22
| ----------------------------------------------------------------------
--- <----Min-Major
10.0/23 | 1
1 <----10
| 1
1 1 <----11
-
Major ------------------------------------------------------------
-------------
- 1
1 <----12
12.0/23 | 1
1 1 <----13
12.0/22
-------------------------------------------------------------------------
<----Min-Major
14.0/23 | 1
1 1 <----14
| 1
1 1 1 <----15
-
>From the address 10.10.10.0/24 u can get
8.0/22
8.0/23
10.0/23
12.0/22
12.0/23
14.0/23
If ur not up to more specific then use:
8.0/22 This will sumarrize : 8,9,10,11
12.0/22 This will summarize 12,13,14,15
if ur up to specific summary then use:
8.0/23 This will summarize 8,9
10.0/23 This will summarize 10,11
and
12.0/23 This will summarize 12,13
14.0/23 This will summarize 14,15
We cant summarize on the last bit as this is the most specific.
-Mamoor
----- Original Message -----
From: Paul (SESAMe) <paul@sesamedata.net>
To: <ccielab@groupstudy.com>
Sent: Saturday, March 23, 2002 3:55 PM
Subject: Summerisation general IP
> 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
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:57:19 GMT-3