15. MPLS
MPLS
IETF , . MPLS (Multiprotocol Label Switching), - . MPLS . IP- IntServ DiffServ . MPLS IP, IP-, QoS. MPLS , IP-, , . . .25, Frame Relay, ( ), . MPLS, , , QoS.
MPLS (. 15.1):
(20 ) ;
(EXP) 3 , . , . MPLS- , , DiffServ;
MPLS- 1 MPLS. , - ;
TTL (8 ) IP-, .
. 15.1. MPLS
MPLS- , IP, Ethernet, Frame Relay OSI, . MPLS , IP-.
. 15.2 : PPP, Ethernet, Frame, Relay, ATM.
. 15.2. MPLS
MPLS , 2. , , Frame Relay, Ethernet. PPP (Point-to-Point Protocol) IP- . . , , . Frame Relay MPLS , . VPI/VCI , MPLS . MPLS , . HDLC (High-level Data Link Control, ). HDLC , . .25 LAP-B (Link Access Procedure Balanced). HDLC .
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1. ;
2. ();
3. .
MPLS - . , MPLS, . , MPLS. MPLS, , IP- (. . 12.2). MPLS MPLS , QoS. MPLS IP- . , FEC (Forwarding Equivalency Class). FEC , :
IP-;
TCP-
. MPLS DiffServ QoS. FEC . EXP , . DiffServ MPLS. 15.3 MPLS. MPLS MPLS, . .
(LSR)
LSR (Label Switching Router) MPLS. LSR , MPLS. LSR IP-, Frame Relay, . MPLS : , Ethernet, Frame Relay . , MPLS - . , MPLS , IP-. , MPLS, LSR . , X.25, FR ATM.
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