Re: simple question regarding the Routing Table.

From: Raghav Bhargava (raghavbhargava12@gmail.com)
Date: Sun Mar 29 2009 - 19:06:23 ART

I think with the first command that I mentioned, it does the exact match i.e
only that route. With the second command it does for the entire network.

Please correct me if I am also wrong...

raghav

On Sun, Mar 29, 2009 at 3:03 PM, Divin Mathew John <divinjohn@gmail.com>wrote:

> * * 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-multipointis 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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> 

-- 
Warm Regards
Raghav

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