From: Scott Morris (smorris@ipexpert.com)
Date: Wed Sep 26 2007 - 20:51:56 ART
That would be any further subnet of 200.2.2.0/24, but let's try it a
different way. Say you wanted to have any RFC 1918 address, but ONLY if it
were /24 subnet mask.
ip prefix-list RFC1918 seq 10 permit 10.0.0.0/8 ge 24 le 24
ip prefix-list RFC1918 seq 10 permit 172.16.0.0/12 ge 24 le 24
ip prefix-list RFC1918 seq 10 permit 192.168.0.0/16 ge 24 le 24
Same logic. The route must fall within those network ranges. But the mask
must equal /24 (in order to be both less than and greater than at the same
time, we logically wind up with "equal")
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
_____
From: groupstudy email [mailto:groupstudy@gmail.com]
Sent: Wednesday, September 26, 2007 4:46 PM
To: smorris@ipexpert.com
Cc: ccielab@groupstudy.com
Subject: Re: Prefix List Question
Scott,
It kind of helps. Thanks for that.
Perhaps a simpler example would drive the point home for me.
What about this:
ip prefix-list test seq 300 permit 200.2.2.0/24 <http://200.2.2.0/24> le 32
What would this include?
Thanks
On 9/26/07, Scott Morris <smorris@ipexpert.com> wrote:
It permits routes where the network portion is from 2.0.0.0 to 2.1.255.255
and the network mask is less than or equal to 32 bits (15-32)
There are two pieces to a prefix list. One says the "network/route" is
within a particular range. The second will give criteria about mask length.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
groupstudy email
Sent: Wednesday, September 26, 2007 2:56 PM
To: ccielab@groupstudy.com
Subject: Prefix List Question
Guys,
I have a quick question on prefix-lists. It is difficult to find good info
on this.
What exactly does this line do:
ip prefix-list test seq 300 permit 2.0.0.0/15 le 32
What ranges does it cover.
I'm really confused by this.
Thanks in advance.
S. Rick
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