Re: IP Prefix List Question

From: sabrina pittarel (sabri_esame@yahoo.com)
Date: Sun Dec 17 2006 - 05:06:17 ART

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Hi Mohammad,
I don't think your statements are correct. Look at the difference
in behavior of the 2 prefix lists below:

r3#sh ip prefix-list VLAN45
ip prefix-list VLAN45: 1 entries
   seq 5 permit 150.1.4.0/23
r3#sh ip
prefix-list VLAN45 150.1.4.0/23 first-match
   seq 5 permit 150.1.4.0/23 (hit
count: 0, refcount: 1)
r3#sh ip prefix-list VLAN45 150.1.4.0/24 first-match
r3#sh ip prefix-list VLAN45 150.1.5.0/24 first-match

r3#sh ip prefix-list
VLAN45_2
ip prefix-list VLAN45_2: 1 entries
   seq 5
permit 150.1.4.0/23 le 24
r3#sh ip prefix-list VLAN45_2 150.1.4.0/23
first-match
   seq 5 permit 150.1.4.0/23 le 24 (hit count: 0, refcount: 1)
r3#sh ip prefix-list VLAN45_2 150.1.4.0/24 first-match
   seq 5 permit
150.1.4.0/23 le 24 (hit count: 0, refcount: 1)
r3#sh ip prefix-list VLAN45_2
150.1.5.0/24 first-match
   seq 5 permit 150.1.4.0/23 le 24 (hit count: 0,
refcount: 1)
r3#

Sabrina

----- Original Message ----
From: Mohammad Saeed
<mzsaeed@gmail.com>
To: Cisco certification <ccielab@groupstudy.com>
Sent:
Saturday, December 16, 2006 11:39:25 PM
Subject: IP Prefix List Question
Hello Every Body,
Here is the configuration...

conf t
!
ip prefix-list VLAN45
seq 5 permit 150.1.4.0/23
!
route-map ADDASPATH permit 10
 match ip address
prefix-list VLAN45
 set as-path prepend 100 100 100
!
route-map ADDASPATH
permit 20
router bgp 100
neighbor 204.12.1.254 route-map ADDASPATH out
end
wr
Now as per my understanding above IP prefix-list shall match 150.1.4.0
and
150.1.5.0. But if IP Prefix list is like this:

ip prefix-list VLAN45 seq 5
permit 150.1.4.0/23 le 24

what diffirence it will make?

And if it is like
this:

ip prefix-list VLAN45 seq 5 permit 150.1.4.0/24
ip prefix-list VLAN45
seq 5 permit 150.1.5.0/24
route-map ADDASPATH permit 10
 match ip address
prefix-list VLAN45
 set as-path prepend 100 100 100

Would the abobe route map
will prepend 100 100 100 for both networks
or it will add only for the first
one?

Thanks for any help in advance.

Regards,

Mohamamd Zahid Saeed

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