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| Can someone here explain exactly what a supernet is? I know how to sub-subnet, but after the exam I am a little confused as to what they classify as a supernet. | |
| blancoj17 2002-03-21, 3:51 pm |
| Aken,
Supernetting is the same as summarization
JB | |
| haseeb_eng 2002-03-22, 4:47 am |
| mmmmmmmmmm man i don't remember exactly , in supernetting you can use more hosts then 254 hosts e.g if you want more the 254 hosts in a subnet so what you can do is take 2 ip addresses combine their bits or do some subnetting or something like that so you can have more then 254 hosts on that subnet . Aken some members will explain better then me so just wait for their reply | |
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| In a nutshell, supernetting is route aggregation (have I spelt that right?? ). Used by ISP's and so forth to cut down the number of route table entries on their backbone routers. You may know it as CIDR??? | |
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| OMG...what am I doing in the CCIE Forum?...I am not worthy | |
| strikeattack 2002-03-22, 10:50 am |
| Yep, Route aggregation, route summarization, and supernetting are basically the same thing.
Supernetting is logically the opposite of subnetting.
When subnetting you borrow bits from the host id, and designate them as the network id.
When supernetting, you borrow bits from the network id, and designate them as the host id.
Get it? | |
| chodan 2002-03-23, 8:09 pm |
| say an ISP allocates you a 8 class C network space. to you it would be
202.1.1.0/24
202.1.2.0/24
202.1.3.0/24
and so on through 202.1.8.0/24
On their router it would look like this
202.1.1.0/21
That help? | |
| chumley 2002-04-01, 10:49 am |
| Mmm, I'm confused.
If an ISP allocated 8 class C addresses then they would be
202.1.0.0/24
...
202.1.7.0/24
On the router this would be summerised to
202.1.0.0/21
Take a look at my PHP subnet calculator
http://ccna.exampointers.com/subnet.htm | |
| chodan 2002-04-01, 11:08 am |
| quote:
Originally posted by chumley
Mmm, I'm confused.
If an ISP allocated 8 class C addresses then they would be
202.1.0.0/24
...
202.1.7.0/24
On the router this would be summerised to
202.1.0.0/21
Take a look at my PHP subnet calculator
http://ccna.exampointers.com/subnet.htm
I`m not sure what your referring to except that I used 202.1.1.0 not 202.1.0.0 | |
| AndyC 2002-04-01, 11:08 am |
| Er...what are you confused about?...with your skills you should be able to do it in your sleep... | |
| chumley 2002-04-01, 11:16 am |
| quote:
Originally posted by chodan
I`m not sure what your referring to except that I used 202.1.1.0 not 202.1.0.0
Reason for the confusion was why the example didn't start at 202.1.0.0/24.
And 202.1.8.0/24 would have been the start of the next /21 block. | |
| chodan 2002-04-01, 11:21 am |
| sorry your right
wasn`t paying attention  | |
| chodan 2002-04-01, 1:06 pm |
| You know whats weird.
Our ISP assigned us 7 class C subnets.
on their router they have 3 summerization entries.
If they had turned loose of one more class C they could have summerized it with a single entry.
They probably had their reasons. |
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