Hello Daryl,
>> But when watching the video and they put OSPF on the routers they for neighbors no problem. How is this possible?
There are network diagrams that describe physical interconnection between devices, and there are network diagrams describing logical connections between devices.
From the network diagram that you have attached I would say this is a network diagram showing logical connections.
It says that the link between R1-R4 is made in Vlan 4 and that R1 uses subinterface fas0/0.4 on this link.
The only reason to have subinterfaces on R1 is that its Fas0/0 interface is not directly connected to R3 interface, but to a port of switch0 configured as a trunk port.
This trunk port has to allow two vlans: vlan 4 for connecting to R3, vlan 2 to connect to R5 via switch0 and via switch1
In the same way R3 interface is connected to switch0 to an access port in Vlan 4.
By the way, why a Vlan id would be specified for a direct router to router link ? The Vlan has to be defined on a switch and this an hint for connecting router interfaces to the switch and not directly.
This means:
switch 0:
create Vlan 2,4
configure port fas0/1 as an access port in Vlan4 connect R3 fas0/0 to it
interface fas0/1
desc to R3:fas0/0
switchport mode access
switchpot access vlan 4
!
interface fas0/2
desc to R1:fas0/0 trunk
switchport mode trunk
switchport trunk allowed vlan 2,4
interface fas0/24
desc to Switch1 vlan 2
switchport mode access
switchport access vlan 2
Actually there are many ways to do this, my guess is that the lab involves interaction between routers and switches to achieve L3 router interconnections.
Once correct L3 connectivity is established between routers at IP level you should see all the expected OSPF adjacencies formed
Hope to help
Giuseppe
