OSPF different Process ID within same area ????

[crscrsone]

I have 2 routers connected with OSPF SINGLE AREA 0

Router 1 Int IP as follows:

Ethernet0 192.168.1.1/24

Serial0 192.168.2.1/24

Router_2Int IP as follows:

Ethernet0 192.168.3.1/24

Serial1 192.168.2.2/24

Router_2#

Router 1 Config as follow:

!

router ospf 5

log-adjacency-changes

network 192.168.1.0 0.0.0.255 area 0

!

router ospf 10

log-adjacency-changes

network 192.168.2.0 0.0.0.255 area 0

!

Router 2 Config as follow:

no ip mroute-cache

!

router ospf 1

log-adjacency-changes

network 192.168.2.0 0.0.0.255 area 0

network 192.168.3.0 0.0.0.255 area 0

!

Router 1 routing table as follows:

Gateway of last resort is not set

C 192.168.1.0/24 is directly connected, Ethernet0

C 192.168.2.0/24 is directly connected, Serial0

O 192.168.3.0/24 [110/74] via 192.168.2.2, 00:06:13, Serial0

Router1#

Router 2 routing table as follows:

Gateway of last resort is not set

C 192.168.2.0/24 is directly connected, Serial1

C 192.168.3.0/24 is directly connected, Ethernet0

Router_2#

Why Router 2 can not learn 192.168.1.0 network form router 1 ?

[pkhatri · Accepted solution]

Hi,

When you have multiple OSPF processes on the same router, they don't communicate by default. To fix this, add the following to router 1:

router ospf 10

redistribute ospf 5 subnets

Hope that helps - pls rate the post if it does.

Paresh

[pkhatri · Accepted solution]

Hi,

The other alternative, of course, is to do this on router 1:

no router ospf 5

router ospf 10

network 192.168.1.0 0.0.0.255 area 0

Hope that helps,

Paresh

[crscrsone]

Thansks, it is great help.

However, WHY I can not add

router ospf 5

redistribute ospf 10 subnets

[pkhatri]

Which of the options have you tried, the first one or the second ?

Pls post the current config you have got and what you are trying to do and I'll take a look.

Paresh

[mheusinger]

Hello,

The final configuration on R1 should look like this:

router ospf 5

redistribute ospf 10 subnets

network 192.168.1.0 0.0.0.255 area 0

router ospf 10

redistribute ospf 5 subnets

network 192.168.2.0 0.0.0.255 area 0

The much simpler approach would be to have only one OSPF process on R1 routing on both interfaces:

router ospf 5

network 192.168.0.0 0.0.255.255 area 0

And this should give you the desired connectivity.

Hope this helps! Please rate all posts.

Regards, Martin