ospf type 5 prefix and bgp

[anastasiou82]

Hi everyone.

The last days i have been struggling with the following case:

Lets assume that we have two directly connected routers R1 ----> R2 . Among them there is  eBGP Peering. R2 advertises some prefixes to R1 through BGP. Moreover on R1 i have configured some static routes as well as i have

redistributed 

those routes into ospf

(redistribute static)

on R1.  When the eBGP Peering is down, i am able to see the

redistributed

static routes as ospf type 5 (

show ip ospf

database summary). But, in case where eBGP peering is up, ospf type 5 routes are removed from ospf database.

Could someone explain me why this happens ?

Thanks a lot,

Nikos

[MHM Cisco World]

That not complete story R must ibgp with other router which make this issue 

[anastasiou82]

The static routes and the routes which are advertised over eBGP are the same.  

[Flavio Miranda]

Hi

 Do you have

redistribute

static on BGP  ?

[anastasiou82]

Hi,

Yes on R1. Essentially the static routes on R1 are advertised over eBGP from R2

[Flavio Miranda]

This can be due the protocol preference as router selects the route with the highest preference. eBGP preference is 255 while OSPF is 10.

when the BGP is down the OSPF routes is installed but when eBGP come up , it has the preference

[anastasiou82]

Jul 1 16:33:18.246: RIB Redist, Topo Base, dest x.x.x.x, mask 255.255.224.0, Down

[Flavio Miranda]

what was that sorry?

[anastasiou82]

The message i get (

show ip ospf 

events) when the eBGP peering goes up

[Flavio Miranda]

Run this command with and without the BGP:

show ip ospf X  rib redistribution x.x.x.x

[anastasiou82]

I will check it. Thanks al lot Flavio

[Flavio Miranda]

You´re welcome.

 But, it seems it is related to protocol preference. 

[MHM Cisco World]

can I see config of R1
R1-R2 
both have eBGP and in same time there is OSPF between two routers ?
If Yes then eBGP have AD=20 and it prefer than OSPF=110 

[anastasiou82]

no, R1-R2 have only eBGP peering.  R1 has ospf peering with other router. 

[MHM Cisco World]

OK your static route have AD upper than 20 ?

show me config and show me show ip bgp and show ip route