MPLS, , . (, IP-) LER (FEC), - FEC "" / - , . MPLS , LSR. LSR, , FEC. , .
FEC - Forwarding Equivalence/Equivalent Class - - , ( ).
FEC IP- IP- ( ) . .., , (ToS).
MPLS I.SR LIB - , : "FEC-". .. / LSP MPLS, MPLS.
LSP , ( "" ). LSP - LDP.
LDP - Label Distribution Protocol - - , IP/MPLS LSR LSP, IETF-MPLS-LDP-05).
LSP - Label Switched Path - / ( ) - IP- , MPLS.
LSP - , LSP: . MPLS LSP:
- (hop-by-hop routing), LSR FEC;
- (explicit routing - ER), LSR LSP.
MPLS "FEC-" , . LSR NHLFE (Next Hop Label Forwarding Entry) - . : , . , .. - . , LSR.
MPLS- ( - LSR) : () LSR LER LSR. LSR MPLS (ATM, FR, Ethernet), , ( IP-, , MPLS-).