Supernetting, CIDR, aggregation - all different names for the beast.
It is the way of representing multiple networks with a single mask.
You already know that you can subnet a class C, breaking it into multiple
/27's or /30's, for example. So you can have 192.168.100.0/27, resulting in
subnets 192.168.100.32/27, 192.168.100.64/27 etc. one might then think of
192.168.00.0 as the "supernet" or "aggregation" of all these subnets. Not
technically correct, but for educational purposes it serves.
Suppose you have several class C's /24's. It is possible to advertise them
as a single network, given the right range.
192.168.8.0
192.168.9.0
192.168.10.0
192.168.11.0
192.168.12.0
192.168.13.0
192.168.14.0
192.168.15.0
can be summarized as 192.168.8.0 /21 - mask of 255.255.248.0 and advertised
as a single network. Write that third octet out in binary and see what it
looks like.
Makes life easier for your router, keeps your routing table smaller, helps
control problems associated with route flapping.
With some 90,000 routes being advertised on the internet right now, this is
one way to help contain things.
HTH
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Deepak Sharma
Sent: Saturday, October 28, 2000 7:53 PM
To: cisco
Subject: Supernetting??
Hey all
Its been 2 weeks since ive check back with the group...(ive been on
holidays =)
I see these questions on "Supernetting"...what is it...im guessing a way
to extend the bit masks on subnets???,.....yes or no??
any links or book references will help
thanks
Deepak
_____________________
Deepak Sharma
Technical Analyst
MCSE CCNA ACT A+
Ceridian Canada Ltd.
Tel: 604/267.6231
Fax: 604/267.6201
[EMAIL PROTECTED]
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