WAN - OSPF and LAN routing

[wilson.jr]

Hi ALL,

I'm going to design deploy and manage WAN – OSPF (mostly edge routers) for big company with offices all over America (around 50). LAN is managed by local stuff. How I can protect WAN - OSPF routing table from learning wrong route entered on LAN by local stuff. My plan is to have AREA 0 only because of simplicity. Will multiple AREAs help or is there some other way that i can protect routing tables on edge routers

Thanks

[Edison Ortiz · Accepted solution]

You can't avoid routes entering your WAN Area 0. My suggestion is to use BGP for the WAN and OSPF for the LAN. With this design, you have better control in the route filtering process as you have to manually announce the OSPF LAN subnets in your BGP WAN router. You don't have that control with OSPF.

If you are still inclined to use OSPF, there is a dirty approach of using multiple OSPF process and redistribute between processes as needed.

Regards,

Edison

[wilson.jr]

Thank you for your imput. I have to use OSPF thought