Header Only - DO NOT REMOVE - Extreme Networks

ping doesn't work inter area(OSPF)


Hi,

I am running EXOS VM's in Oracle VirtualBox,I have a topology in this order: R1,R2 and R3. I configured OSPF in one area(0.0.0.0) and all things goes well.But when i tried to make every node in area (R1: area 1.1.1.1 , R2: 2.2.2.2, R3: 0.0.0.0) i could not reach the hole topology

10 replies

configs?
Supermac7 wrote:

configs?

Userlevel 6
Hello Ala

What do you see in the route table? Show IPRoute Do you see the other areas? I am assuming that all 3 routers are part of area 0.0.0.0 with another area 1.1.1.1 or 2.2.2.2 on another port on the switch? In order for the other routes to show up or to be able to ping another interface that VLAN has to be up. You can do this either by enabling loopback on the VLAN or having an active port on the VLAN.

If you can provide a diagram and the show IPR command that would be helpful.

Thanks
P
when i execute "sh ospf lsdb" on R1,R2 and R3 i have these results

Userlevel 7
Hi,

configs would help, as well as "sh ospf neighbors", "sh ospf interfaces", even a "sh vlan".
Userlevel 6
Hello Ala

The config shots you sent are very confusing. I see that you are creating VLANs which from what I can gather are part of other areas. However I don't see that all 3 of your switches are connected to area 0. In addition I don't see any of the VLANs on the same subnet so they can't talk to one another.

The design should have areas 0 connecting to all three switches on port 1 for example. You can then have a VLAN on each switch that is part of another area. So for example port 2 on Sw 1 can be in area 2.2.2.2 port 2 on switch 3 can be on area 3.3.3.3. If those other ports are connected to another device or the VLAN has loopback on them then those routes for those VLANs should be propagated.

Does that help?

P
Paul Russo wrote:

Hello Ala

The config shots you sent are very confusing. I see that you are creating VLANs which from what I can gather are part of other areas. However I don't see that all 3 of your switches are connected to area 0. In addition I don't see any of the VLANs on the same subnet so they can't talk to one another.

The design should have areas 0 connecting to all three switches on port 1 for example. You can then have a VLAN on each switch that is part of another area. So for example port 2 on Sw 1 can be in area 2.2.2.2 port 2 on switch 3 can be on area 3.3.3.3. If those other ports are connected to another device or the VLAN has loopback on them then those routes for those VLANs should be propagated.

Does that help?

P

thank you sir , it helped me a lot 🙂
Userlevel 7
Hi Ala,

you need to connect every area to area 0.0.0.0 for OSPF to work. As I understand your question, you connected area 2.2.2.2 to 1.1.1.1 and 1.1.1.1 to 0.0.0.0. OSPF does not support this configuration.

Best regards,
Erik
Userlevel 4
Ala,

If any of the areas cannot reach your backbone area 0.0.0.0, you can configure a virtual link. This will provide a logical path between the ABR of the disconnected area and the ABR of the normal area that connects to backbone.

Command:

configure ospf add virtual-link router-identifier area-identifier

Please review the concept guide and or the command reference guides for further information
Colatuno, Joe wrote:

Ala,

If any of the areas cannot reach your backbone area 0.0.0.0, you can configure a virtual link. This will provide a logical path between the ABR of the disconnected area and the ABR of the normal area that connects to backbone.

Command:

configure ospf add virtual-link router-identifier area-identifier

Please review the concept guide and or the command reference guides for further information

thank you it worked 🙂

Reply