You should use the three layer-model. If it's a large remote office you may connect it til core, if not you should connect it to a distribution switch at the HQ. You must have OSPF (or the same routing protocol) on both routers that are going to connect to each. So let's say I have just 2x Cat4k or 6k that I would like to enable OSPF between (one acts as Core switch where routing for access switches is done and other will be used for access and a bit of a backup, therefor won't be configured for HA), is it probably best to keep it simple and do ospfv2. OSPF gang, sell me on why I should use your beloved IGP. Let's say, hypothetically, I work for a large University. The University has approximately 900+nodes and utilizes a classic, 3-teir network architecture. Currently, the only type of internal L3 routing being used is static routing between the. Cisco Meraki layer-3 MS switches support the use of the OSPF routing protocol to advertise its subnets to neighboring OSPF- capable layer 3 devices. OSPF is loop-free, provides fast route convergence, and supports area partitioning, equal-cost routes, authentication, and multicast transmission. Therefore, OSPF is widely used as the mainstream IGP in various industries, including the enterprise, carrier, government, finance, education, and. OSPF: Open Shortest Path First (OSPF) is a link-state routing protocol that is used in Internet Protocol (IP) networks and suitable to be deployed on single autonomous system (AS), such as an enterprise network.