From: Nisar, Munsar (munsar.nisar@citi.com)
Date: Thu May 24 2007 - 09:48:47 ART
Look at the three common bits in the third octet and you would get the
answer to your own question: all the common bits are zero so your third
octet should be zero as well. Thanks.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Shamin
Sent: Thursday, May 24, 2007 8:04 AM
To: Cisco certification; Cisco certification
Subject: OSPF AREA RANGE , Problem
Dear All,
I have a rather basic question. If someone can clear it off.
I have the topology as below.
Area 1 Area 0
R2 <----------------------> R3 <---------------------> R4
I am running Ospf Area 1 between R2 & R3 , and Area 0 between R3 & R4.
R4 has 4 loopback interfaces with the following IP's advertised into
Area 0
10.10.4.1
10.10.18.1
10.10.20.1
10.10.25.1
The requirement is that, R2 sees a single route all these 4 networks.
So we have to configure a area range command.
Now my qestion is , If the question is that the summary should be as
specific as possible,
how will the summary configuration be like.
The binary for the 3rd octet is as below,
4 - 00000100
18 - 00010010
20 - 00010100
25 - 00011001
As per my understanding, we can configure to the summary to be till the
19th
bit. i.e 255.255.224.0
So should the configuration be on R3 as below:
router ospf 1
area 0 range 10.10.4.0 255.255.224.0
OR
router ospf 1
area 0 range 10.10.0.0 255.255.224.0
With the 1st config, the router gives a error, that of an Iconsistent
mask.2nd config is accepted
Can any one guide me as to which is the correct config and is my
configuration meeting the requirement
that the summary shoyld be as specific as possible.
Regards
All the best in your preprations
Shamin
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