Section 4.3 OSPF Stub Area - IEWB Vol 3 v4.1
Not sure if I am mistaken on this, but I believe there is an error in Section 4.3 (OSPF Stub Area) of Lab 1 of IEWB Vol 3 v4.1.
First off, the diagram depicts that SW1's f0/21 interfaced is to be on Vlan C, OSPF 3 and be a OSPF Stub and neighbor with R5. While F0/21 is not being used (as in other typical physical wiring topologies between SW1 and SW4 (F0/19-21 and F0/19-21), it is clearly not possible to have F0/21 of SW1 be a Native Routed port and connected to R5. That would be possible if R5 was connected to SW1's F0/21, but it is not. R5's E0/1 interface is connected to SW3. Problem is that SW3 is not the switch that should be in OSPF Area 3 (and Vlan 57) with R5. While I have configured SW3's F0/5 in Vlan 57 and R5's E0/1 port has the ip address 18.104.22.168, the only thing I am thinking is that this is clearly a typo what should have been requested is an SVI interface 57 on SW1 with the ip address of 22.214.171.124. That is the what I have configured temporarily so that I could move on completing the rest of the lab tasks. Again, as I mentioned earlier, if R5 was connected to SW1 on port F0/5, then I could make F0/5 on SW1 a Native Routed port and configure both devices with their ip addresses per the diagram. But that is not the case.
Anyhow, I hope someone can clarify that this in fact is an error. I will be in total shock if I am wrong.
Thanks and I hope I am making sense here since it is 1:00 a.m. now.