From: Cisco Fanatic (ebay_products@hotmail.com)
Date: Mon Mar 30 2009 - 13:15:29 ART
!
int loop0
ip add 5.5.5.5 255.255.255.252
!
router ospf 1
redistribute connected subnets route-map LOOP0
!
route-map LOOP0 permit 10
match interface Loopback0
!
still seeing 5.5.5.5/32 instead of 5.5.5.5/30?
> Date: Mon, 30 Mar 2009 17:12:38 +0530
> Subject: Re: simple question regarding the Routing Table.
> From: gauravmadan1177@gmail.com
> To: raghavbhargava12@gmail.com
> CC: ccielab@groupstudy.com
>
> Most questions asked by Raghav are already answered , Just adding my
> specific opinon on this
>
> There are a few ways that u need to keep in mind regarding /24 , /32 funda
> and conversion :
>
> [A] LOOPBACK network type is always adv with /32 .
>
> For converting this to right mask :
>
> [A] Adv it as point to point network type
>
> if this is denied
>
> [B] Adv this as external route .
>
> if this is denied
>
> [C] Adv this in a given area and then summarize this area as /24 ( area <>
> range )
>
> if this is denied
>
> [D] Adv this loopback in alltogether diff ospf process and do
redistribution
> in 2 ospf processes created ,
>
> These are things that were there my study notes :)))) Ifsomeone has more
> ideas ; please pour in :)
>
> HTH
> Gaurav Madan
> CCIE # 23863
>
>
> 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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