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shresth_14
 Post subject: Ospf configuration question!
PostPosted: Wed Mar 24, 2010 11:12 pm 
Hi,
During the configuration of ospf, can we configure a default route which directs traffic out through a particular loopback or interface (say loop0). This default route will eventually be advertised throughout the entire network topology.
If so how?
Thanks
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rednectar
 Post subject: Re: Ospf configuration question!
PostPosted: Thu Mar 25, 2010 12:33 am 
Offline

Joined: Fri Mar 05, 2010 11:33 am
Posts: 509
Location: Australia
I thought this would be easy:
Code:
router ospf 1
redistribute static
network 0.0.0.0 255.255.255.255 area 0

ip route 0.0.0.0 0.0.0.0 Loopback0

But luckily I tested it before I posted ;)

OSPF doesn't redistribute the default route in this case. I haven't worked out why, but I have a work-around. Here's the work-around - I hope someone else comes up with a better solution - I'll be watching.
Code:
hostname R1
router ospf 1
redistribute static
network 0.0.0.0 255.255.255.255 area 0

!Dummy route to all Class A addresses
ip route 0.0.0.0 128.0.0.0 Loopback0
!Dummy route to all Class B, C, D... addresses
ip route 128.0.0.0 128.0.0.0 Loopback0

Proof on R2
Code:
R2#show ip route
!output ommitted
O E2 0.0.0.0/1 [110/20] via 10.1.2.1, 00:24:42, FastEthernet0/0
O E2 128.0.0.0/1 [110/20] via 10.1.2.1, 00:24:19, FastEthernet0/0

_________________
RedNectar
http://rednectar.net
@rednectarchris
GNS3 WorkBench-a VMware image of Ubuntu with GNS3 and VPCS installed and a collection of exercises/labs
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shresth_14
 Post subject: Re: Ospf configuration question!
PostPosted: Fri Mar 26, 2010 1:47 am 
rednectar wrote:
I thought this would be easy:
Code:
router ospf 1
redistribute static
network 0.0.0.0 255.255.255.255 area 0

ip route 0.0.0.0 0.0.0.0 Loopback0

But luckily I tested it before I posted ;)

OSPF doesn't redistribute the default route in this case. I haven't worked out why, but I have a work-around. Here's the work-around - I hope someone else comes up with a better solution - I'll be watching.
Code:
hostname R1
router ospf 1
redistribute static
network 0.0.0.0 255.255.255.255 area 0

!Dummy route to all Class A addresses
ip route 0.0.0.0 128.0.0.0 Loopback0
!Dummy route to all Class B, C, D... addresses
ip route 128.0.0.0 128.0.0.0 Loopback0

Proof on R2
Code:
R2#show ip route
!output ommitted
O E2 0.0.0.0/1 [110/20] via 10.1.2.1, 00:24:42, FastEthernet0/0
O E2 128.0.0.0/1 [110/20] via 10.1.2.1, 00:24:19, FastEthernet0/0


Makes Sense!
Thanks RedNectar!
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lga
 Post subject: Re: Ospf configuration question!
PostPosted: Sun Apr 04, 2010 9:42 pm 
To redistribute a default route with OSPF you need to use "default-information originate" into ospf statement.

This command will generate a default route for others routers into OSPF cloud. On the default gateway, you put a static route like "ip route 0.0.0.0 0.0.0.0 lo 0"

Regards,

Lionel
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