If we look at this question in terms of moving the network mask to the left
or to the right, all of these terms come into perspective.
Take the mask 11111111.11111111.11110000.00000000
Ones indicate the network portion. Zeros indicate the host portion.
If we shrink ( move to the left ) the zeros, we are, depending upon the
context, summarizing, supernetting, aggregating.
If we expand ( move to the right ) the ones, we are subnetting. If we start
with the same network mask, and expand the ones differently for several
different subnets, we are variably subnetting, or using VLSM.
I think it is more useful to understand what is happening at the bit level
than to worry about terminology that is admittedly used sloppily in the
various study materials we use.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Donald B Johnson Jr
Sent: Thursday, November 09, 2000 5:15 PM
To: Brian; jeongwoo park
Cc: Groupstudy
Subject: Re: After supernetting!!
I thought supernetting was combining several small networks into one big
one, the opposite of subnetting which takes one big network and breaks it
into smaller ones.
Summarizing is a technique where you combine several larger perfixs into one
smaller prefix that includes the larger perfixs and then advertise the
smaller prefix in routing updates. This technique reduces routing table
entries.
Aggregation and VLSM are different too. These terms are not interchangable.
You should really have a clear understanding of these concepts for the big
one.
Duck
----- Original Message -----
From: Brian <[EMAIL PROTECTED]>
To: jeongwoo park <[EMAIL PROTECTED]>
Cc: Groupstudy <[EMAIL PROTECTED]>
Sent: Wednesday, November 08, 2000 8:57 AM
Subject: Re: After supernetting!!
On Tue, 7 Nov 2000, jeongwoo park wrote:
> Hi all
> Let's say there are 5 subnets (Class B/16 subnet mask)
> consisting of approximately 500 DHCP clients and 20
> servers.
> Someone as a Network Expert suggested flattening the
> network. As a Network newbie, I simply followed the
> instruction from the book on how to supernet, and
> finally summarized those 5 contiguous subnets into
> following address: 123.80.0.0/14 (**this is a made-up
> number) Now I am done with supernetting. What is the
> next to be done?
> What should I do with this ip address?
> Should I go to physically to these 520 stations one by
> one for new tcp/ip setup? I think there should be
> better way than this.
Supernetting, summarizing, whatever you want to call it, at aggregation
points within your network is a great idea, so yes I agree that somewhere
in your network you should try to aggregate routes as much as possible.
Flattening a /14 worth of space and giving users a 255.252.0.0 netmask on
their desktops sounds more like "Super-kludging" than "supernetting" :)
Why would you have 520 stations consuming a /14 worth of space anyways?
Brian
>
> Looking for your help.
>
> Thanks
> jw
>
>
>
>
>
>
>
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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