Well I have spent that last few hours trying to figure out why R5’s interface e0/0 on Vlan 105 could not ping the routed interface in vlan 105 on SW4. I even got to the point where I did a “write erase” on all the switches and copied the vlan tasks and trunk tasks right out of the solution guide, but still nothing.

If I plugged in R5’s e0/0 interface right into SW2 where the routed port on SW4 was connected to I could ping without an issue. So I decided well there has to be a spanning-tree issue going from SW1 where R5’s interface is plugged into. So I start checking spanning-tree and saw the root port for vlan 105 is going over to SW4. Now I know further ahead in the switching tasks I will stop all vlans except 102 from going over that trunk link, but the solution guide is showing they can ping before that trunk link is configured for vlan 102 only. So I just shut that trunk port down on SW1 and sure enough all my pings start going through. Could it have been just a forwarding loop?

That is what I get for being proactive and checking my end to end connectivity right after I configure the trunks links I guess…