RE: Prefix-list

From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Tue Mar 25 2003 - 12:36:23 GMT-3


Actually if he wants the 2nd octet to be 200 and nothing but 200 he must use

200.200.x.0/16

yhen if he wants the "x" to be don't care he must use the "ge 24 le 24"

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Frank Maisano
Sent: Tuesday, March 25, 2003 8:53 AM
To: 'Motohiro Yamanaka'; ccielab@groupstudy.com
Subject: RE: Prefix-list

I think your idea would work but I would venture a more correct
answer would be: 200.200.x.0/13 ge24 le24

I have not been able to find a lot of good documentation, but
from what I have seen, you need to find the significant bits
for the octet you care about (like a CIDR address).

Your second octet is 200 which looks like this:

11001000

You really only care about the first 5 bits. The last 3 are zeros
and therefore, can be subtracted from the /16 you indicated.

If this is not correct, I invite any and all to correct me so I can
get it right as well.

-----Original Message-----
From: Motohiro Yamanaka [mailto:yamanaka@fsas.fujitsu.com]
Sent: Tuesday, March 25, 2003 2:54 AM
To: ccielab@groupstudy.com
Subject: Prefix-list

Hi all

I want to write the undermentioned network by one line by using
"Prefix-list". How should I do?

200.200.X.0/24 (X is arbitrary)

My idea is

#ip prefix-list ATM-EIGRP seq 5 permit 200.200.0.0/16 ge 24 le 24

Is this correct?

Thanks

-------------------
Motohiro Yamanaka



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