From: Divin Mathew John (divinjohn@gmail.com)
Date: Sun Mar 29 2009 - 19:03:13 ART
* * Loopbacks are considered host routes in OSPF, and they are advertised
as /32. In Cisco IOS Software Releases 11.3T and 12.0, if the ip ospf
network point-to-point command is configured under loopbacks, OSPF
advertises the loopback subnet as the actual subnet configured on loopbacks.
ISDN dialer interface advertises /32 subnet instead of its configured subnet
mask. This is an expected behavior if ip ospf network point-to-multipoint is
configured.
and for the network command..! its nothing but telling your OSPF process to
start OSPF on that interface.! thats all... that basically if u give a
network x.x.x.x 255.255.255.255 area 0 ..it will indeed make sure that OSPF
is started on all interfaces which have an ip address and are not shut
down.!
correct me if i am wrong!
Thanking You
Yours Sincerely
Divin Mathew John
divinjohn@gmail.com
divin@dide3d.com
+91 9945430983
+91 9846697191
+974 5008916
PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
Sent from: Bangalore KA India.
On Mon, Mar 30, 2009 at 3:16 AM, Raghav Bhargava <raghavbhargava12@gmail.com
> wrote:
> 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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