I have a question regarding LDP tunnel LSP which I can't think of a satisfied answer.
Suppose we have two routers connected back to back, but, LDP is not enabled on either router's interface. If I configure EoMPLS in between , a LDP targeted session will be initiated and both prefix-fec and VC-fec mapping will be exchanged. In current IOS image, the l2 vc will not come up because the tunnel LSP is not ready. Now my question is, why do we need to enable LDP on the interface in order to bring up the tunnle LSP? from either router's point of view, it has label mapping to peer's router-id and peer is directly connected, it should just install the label (either implicit-null or explicit null) in its LFIB, and declare LSP is ready, right?
Anybody can please tell me why the router decides not to install the tunnel label?