I've heard from a friend that this is the solution before virtual-link. In my opinion, using tunnel that add overhead and reduce the path MTU is not preferred. Dealing with MTU issue was a pain in the day that I was not quite understand it thoroughly. Some platform does not support GRE at all, some process GRE with its CPU which has very limited capacity comparing for the large volume of traffic that it is delivering through the specialized hardware processing. So we need to be careful when deciding to use GRE.
... View more