task 4.3 volume II lab 12
i had the idea for this task to activate mpls only on the serial link between R5 and R4. That was interesting because at the end of the task although i was able to see the loopback of VPNA in SW4 i wasn`t able to ping it.After 30 minutes passed reviewing my config i thought if the problem could be because of the returning traffic from R4 going through a non MPLS path via fastethernet0/0 interface. After changing the bandwidth over that segment i forced the path going to the serial link and everything worked as expected. But that sound new to me cause i always saw that MPLS is not mandatory to be configured for exchange of VRFs via bgp but only after forcing the path via MPLS i got the connection. Am i wrong in my assumption or am i missing something else in the task?