From: Gyo (Gabor.Gyori@xxxxxx)
Date: Sun Jun 30 2002 - 07:39:32 GMT-3
It confused me too, so I have made some tests.
The results:
- The /32 mask is sufficient for the interface in order to run OSPF on it
- The OSPF advertises the given interface with /32 mask instead of the
original (f. e. /24 interface subnet mask)
In fact, the interface is advertised with the lower mask of interface
mask and the network .. area mask.
So I disrecommend to use /32 mask in ospf process expect it is directly stated
to advertise the interface as /32.
Gabor
-----Original Message-----
From: Ahmed Al-Ghawas [mailto:ghawas@batelco.com.bh]
Sent: Saturday, June 29, 2002 9:37 PM
To: ccielab@groupstudy.com
Subject: OSPF wildcard bits
Guys,
I am really getting confused!
>From what I understood from "CCIE Practical Studies" book that when using the
network command, that you ought to be precise in the extent that you would add
the interface ip address and not advertise the whole subnet mask!
For example:
R1
S0:10.1.128.1/24
|
|
S0:10.1.128.2/24
R2
S1:10.1.80.1/24
|
|
S1:10.1.80.3/24
R3
R1 config:
router ospf 2001
network 10.1.128.1 0.0.0.0 area x (and not; network 10.1.128.0 0.0.0.255 area
x!!)
R2 config:
router ospf 2001
network 10.1.128.2 0.0.0.0 area x (and not; network 10.1.128.0 0.0.0.255 area
x!!)
network 10.1.80.1 0.0.0.0 area x (and not; network 10.1.80.0 0.0.0.255 area
x!!)
R3 config:
router ospf 2001
network 10.1.80.3 0.0.0.0 area x (and not; network 10.1.80.0 0.0.0.255 area
x!!)
I really need to stick to one concept and understand why this book doest it
differently then the other and avoid loosing marks for such stupid thing in
the real lab!!
Any input is much appreciated
Ahmed
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