From: Shamin (ccie.xpert@gmail.com)
Date: Thu May 24 2007 - 09:04:15 ART
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
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:22 ART