To create a Cisco network lab for CCNA OSPF routing, you will need one or more Cisco routers and a network simulator program such as GNS3 or Packet Tracer.

Here are the basic steps to create a simple OSPF lab in GNS3:

1. Download and install GNS3 on your computer.
2. Download and import IOS images for the routers you want to use in your lab. GNS3 supports most Cisco IOS images.
3. In GNS3, create new routers and drag them onto the topology area. You can use any router models that are compatible with the IOS images you have imported.
4. Connect the routers together using virtual cables. This simulates a physical network connection between the routers.
5. Configure the IP addresses for each router interface. For OSPF, you will need to configure at least one interface on each router with a unique IP address that is in the same subnet.
6. Configure OSPF on the routers by using the “router ospf” command in the global configuration mode. Assign unique OSPF process ID and Router ID, and configure the interfaces that will be participating in OSPF.
7. You can verify your OSPF configuration by using the “show ip ospf” command and also “show ip ospf neighbor” to check the neighbor relationships.
8. Once you have configured OSPF on the routers, you can test the connectivity between them by pinging between the interfaces or using show commands to check the routing table.

It’s important to note that this is a simple example and you can always add more complexity to your lab, like adding a few more routers, using different network topologies, testing different OSPF features,and so on, the possibilities are endless.

You can also check some sample labs or tutorials that are available online for OSPF to get more idea and practice.