Per-platform label space, where labels must be unique for the entire platform (router)
An LSP is a sequence of LSRs that forwards labeled packets of a certain forwarding equivalence class.
Unsolicited downstream distribution of labels is a method where each router independently assigns a label to each destination IP prefix in its routing table.
Independent control mode for allocating labels is usually combined with unsolicited downstream propagation of labels, where labels can be created and propagated independently of any other label switch router (LSR).
Liberal label retention mode dictates that each LSR keep all labels received from LDP peers, even if they are not the downstream peers for the network .