I cannot find any information about MRU parameter except the book "Mpls fundamentals" where there is some explanation about sense of this parameter however it is not clear enough. Can somebody explain me how it works? I cannot understand whether MRU is calculated locally or it is exchanged between routers. According to some very restricted notices I have been able to find, MRU have to be exchanged, however, all my experiments was not able to confirm such behaviour. All what I can see is that PHP-router makes its MRU 4 bytes more than others LSR.
