OSPF LOOP

RouterOS Forwarding Protocols
1

Say we have a diamond shaped network with home, first, second and third bases, and a few cross connects
between them.

Everything is Area 0.0.0.0

Each router has many subnets on each interface but only one subnet connects the
routers to each other with a /29.

How do I stop OSPF from broadcasting multicast out of each subnet on each interface? All it needs to do is broadcast one on each interface.

Say ether 1 on home is 10.0.16.28/29, and ether 4 is 10.16.0.17/29

Why am I receiving packets going out ether1 coming back in on ether4 with source address 10.0.16.28. The logs hate this.

Is this a broadcast loop or something else?

Thanks,

Homer W Smith
CEO Lightlink Internet

2

So is it mesh or is it ring? If ring network like you describe (but then add in x-connects between them), are you bridging the interfaces so all routers appear on 1 broadcast domain? If so then this would cause your issue. You may need to turn of OSPF broadcast stuff and to a PtMP style connection by IP only.

3

thank you very much for your answer.

Diamond is a ring with cross connects. There is no broadcast domain loop that I know of, but there does seem to be an ospf loop.

Homer