Re: simple question regarding the Routing Table.

From: Peter Svidler (doubleccie@yahoo.com)
Date: Mon Mar 30 2009 - 04:09:07 ART

for your first question , both methods will run ospf correctly on the
interface .
 
for the second question , ospf by default treat the loopback interface as a
host route (/32) even if the mask is not /32 .
 
when you convert the network type to point to point , ospf will treat it as
normal interface and advertise it with the configured mask

--- On Sun, 3/29/09, Raghav Bhargava <raghavbhargava12@gmail.com> wrote:

From: Raghav Bhargava <raghavbhargava12@gmail.com>
Subject: simple question regarding the Routing Table.
To: "Cisco certification" <ccielab@groupstudy.com>
Date: Sunday, March 29, 2009, 5:46 PM

Hi Experts,

For example we have a loopback interface 0 with the Ip address 4.4.4.4/24

Now when we have to advertise the network in the routing table, which of the
following way is correct:-

router ospf 1
network 4.4.4.4 0.0.0.0 area 4

OR

router ospf 1
network 4.4.4.0 0.0.0.255 area 4

coz if we use any of the way we will see this entry in the routing table:-

    *4.0.0.0/32* is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 1.1.1.1, 00:00:44, FastEthernet0/0

Now another question that I have is if i change the network type of the
loopback from LOOPBACK ( which is default ) to point-to-point then the
routing table entry changes like this

*4.0.0.0/24 *is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 1.1.1.1, 00:00:44, FastEthernet0/0

Please can some one explain this change in the subnet mask????

As far as i know PPP converts the /24 or any other subnet into /32 host
routes. Maybe i could be wrong here......:) 

--
Warm Regards
Raghav

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