- LDP Neighborship failed
- MPLS not enabled,
- LDP TCP-646/711 ports filtered
- No L3 route to LDP neigh
- Router ID
- Label not assigned
- CEF not enabled
- Label not shared
- LDP/TCP comaptible problems between neighbor.
- Slow convergence
- Don't use RIP(slow protocol) as IGP
- IGP is main reason for delay in convergense
- Large packets dropped
- Multiple labels may be present, pushing the MTU to a size not supported by the infrastructure.
- MPU not supported by switches