redistribute static subnets and ip route 0/0

[mahesh18]

Hi Everyone,

I have switch running the ospf and it has ospf neig with inside network

router ospf 2

redistribute static subnets

ip route 0.0.0.0 0.0.0.0 192.42.147.x

ip route 10.70.34.0 255.255.255.0 192.42.147.x

With below config will this switch advertise the default route to its ospf domain?

What I want to achieve is to advertise the static routes with specific subnets but not the default route.

Regards

Mahesh

[rais]

You can control what static routes get distrubuted by using a route-map with 'redistribute static subnet' command.

redistribute static subnets route-map RED-to-OSPF

where route-map RED-to-OSPF would refer to an ACL with subnets allowed to be redistrubuted.

HTH.

[Reza Sharifi]

Hi Mahesh,

Try to redistribute the static route using a route-map

route-map static-to-ospf permit 10

match ip address 1

access-list 1 permit 10.70.34.0 0.0.0.255

router ospf 2

redistribute static subnets route-map static-to-ospf

HTH

[mahesh18]

do i need to apply this to the interface or vlan ?

show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface
10.12.10.199 1 FULL/DR 00:00:35 10.0.12.65 Vlan2600
10.12.10.200 1 FULL/DR 00:00:35 10.0.12.61 Vlan2500

as this has connection to this

interface GigabitEthernet1/1/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2500
switchport mode trunk

interface GigabitEthernet2/1/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2600
switchport mode trunk

Regards

Mahesh

[mahesh18]

also it has  current config under ospf

 redistribute static subnets

so i can add the new config 

redistribute static subnets route-map static-to-ospf

then remove the redistribute static subnets???????

[mahesh18]

also i tested in the lab ospf did not redistribute default route 0.0.0.0/0 into the ospf database.

can you confirm?

[Richard Burts · Accepted solution]

I believe that you are seeing the correct behavior. Remembering that OSPF works a bit differently from other dynamic routing protocols we can see that having a route for 0.0.0.0 does not necessarily result in advertising a default route. For OSPF to advertise a default route you need to configure default information originate.

Several responses treated your question assuming that the solution would be to control the redistribution and there were several good suggestions about how to use a route map to control redistribution. But they are not needed if your requirement is to advertise all static routes (other than the default route) and not to advertise a default route. Simply not configuring default information originate will achieve your requirements.

HTH

Rick

[mahesh18]

 Hi Rich,

I did this change almost month ago and all work as you said in your post.

It is always pleasure to read reply from you.

Change went very well.

Best Regards

Mahesh

[Richard Burts]

Mahesh

I am glad that my response was helpful. Thank you for marking this question as solved. I have enjoyed our discussions and am glad that you continue to be active in the community.

HTH

Rick