the purpose of summarization to to reduce the amount of routes in
your routers routing table.
This is done by adding a summary route for "consecutive blocks of IP's".
in your example the later 4 networks are all consecutive and can be replaced
with the one summarized route. The first network is stand alone.
hope that helps :).
Regards,
Jason Baker
Network Engineer
MCSE, CCNA
-----Original Message-----
From: D. J. Jones [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 20, 2000 9:16 AM
To: [EMAIL PROTECTED]
Subject: Re: To summary or Not to summary and all that jazz
Subnet 172.16.1.128/26 covers all addresses between 172.16.1.129 and
172.16.1.190. Your example falls within that range i.e., 128, 144, 160 and
176.
dj
"Dyland Desmarais" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Greetings all
> For those of you who have the BSCN Cisco press book, you can refer to
pages
> 95 for this question.
>
> A router has the following ip's in its routing table:
> 172.16.1.00110000 [48] /28
> 172.16.1.10000000 [128] /28
> 172.16.1.10010000 [144] /28
> 172.16.1.10100000 [160] /28
> 172.16.1.10110000 [176] /28
>
> Now, the exercise was to determine how these ip's should be summarized.
> This is how I did it:
>
> 172.16.1.48 /28
> 172.16.1.128 /27 [ for ip's 172.16.1.128 and 172.16.1.144 ]
> 172.16.1.160 /27 [ for ip's 172.16.1.160 and 172.16.1.176 ]
>
> The BSCN from CiscoPress shows it this way however:
>
> 172.16.1.48 /28
> 172.16.1.128 /26 [ all other ip's ]
>
> Why would this be the best way of summarizing the routes. I know my way
> adds a extra entry into the routing table, but on the example before (page
> 94) Cisco summarized all the ips [ 6 total ] with 2 summarys instead of 1.
>
> Am I missing a point to watch for when summarizing?
>
> Thanx
>
> Dyland
>
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