Ospf routing for mesh topology configuration

[isinghranbir211]

Hi,

I am trying to configure ospf in network which consist  three routers connecting each other.all routers are connected in same area through ethernet cable.

However it forming loop in packet tracer.

How can I avoid loop for my topology?

Is this fine to use ethernet cable for connecting routers?

Can anyone make it clear? 

Thanks

Ranbir

[Flavio Miranda]

share your pkt file. You must zip it. 

[MHM Cisco World]

forming loop in packet tracer.

It impossible to form loop with OSPF it is link state so it not depend on hop and there is no loop, 
but I wonder how loop form
please share the topology and config "as text here".

[David Ruess]

Hello,

Routing protocols have built in mechanisms to prevent loops. Although not perfect, if you just have a basic OSPF config it should not loop. How are you determining its forming a loop?

Can you provide an image of your topology diagram?

-David

[isinghranbir211]

Hi,

Attaching the topology.plz have look.

Thanks 

Ranbir

[Joseph W. Doherty]

Assuming you're not bumping into a PK bug, you didn't specify how you've interconnected your routers (the physical topology) and/or how you've configured OSFP (the logical topology).  OSPF considers Ethernet multi-access, but you might physically be configured p2p.

Same area should work fine.  There are, of course, consideration when doing multi-area OSPF,

[isinghranbir211]

Hi Joseph,

Plz have look,attaching topology screenshot.

Thanks

Tinku

[MHM Cisco World]

The only thing making loop here that you use same subnet in somewhere 
between router 
or subnet for PC connect to router.

please confirm that you use the right unique subnet in this design.

[David Ruess]

For some reason the forum wont let me respond to your drawing message.

Anyway. If those interfaces are configured like that and you have basic ospf configuration it should not form a loop.

Can you provide the information that you see where you determined you have a loop (i.e. logs, console messages, etc)

If no messages then can you provide the out put of: 'show ip protocols' command on each router?

-David