In article <[EMAIL PROTECTED]>, "Bill"
<[EMAIL PROTECTED]> wrote:
ip subnet-zero allows you to use the .0 subnetwork so if you break
192.168.0.0 into /27s, your first network would typically start at
192.168.32.0 while with subnet-zero enabled you can use 192.168.0.0. As
I understand it, this is basically because of older IP stacks that didn't
understand the all 0's and all 1's subnetworks thus you had 2^n -2.
ipclassless is used in classful networks when you have networks that have
been subnetted and are discontiguous. If you have Router A and C with
both conneted to router B. Most classful routing protocols break
networks at their major boundry so if you had 10.0.1.0/24 advertised off
A and 10.0.2.0/24 off B, you would end up with 2 routes to 10.0.0.0 on B.
When traffic arrives for 10.0.2.1 which link do you send it out? ip
classless overcomes some of these issues.
> Hi,
>
> To configure classless behaviour, we use "ip subnet-zero" and "ip
> classless". I never understand them, even after reading Doyle's bible.
>
> * When do we need them ?
> * If we don't use them, what will happen ?
> * Is there good example to show their effect ?
>
> Thank you in advance.
>
> Bill
>
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