just now stepped into mpls world.
i am refering the book "MPLS Fundamentals" by Luc De Ghein.
In the implicit null portion the author states that " PHP is the default mode in cisco IOS.In case of ipv4 over mpls ,cisco ios only advertise the implicit null label for directly connected routes and summarized routes."
but some of them told me that it will send implicit null for all routes it learns.
Which is true or is there any hidden meaning in connected and summarized routes???