Basics of Multiprotocol Label Switching

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Objective :=

  • Fast switching of packet.
  • Load-balancing traffic.
  • Segregation of traffic is possible customer wise in MPLS.

MPLS as a 2.5 layer protocol :
 

  •    MPLS works on VPN type technology.
  •    It works on layer 2.5 OSI model.
  •   0      MPLS header added and inserted between layer 2 (Data link layer) and layer 3 (Network layer) It is also known as “shim” Protocol.


  • Label : 20 bits label value is used and it takes any values from 0 to 1048575.
    Experimental : 3 bits used for experimental and it generally used for Qos Service.


QoS Policy :-




Stack :  It’s 1 bit long . Either 0 or 1.

TTL :  It’s size 8 bit long. It generally defined as how packet reach from source to destination. its value is decreased by one at each hop to prevent packet to get stuck in network.



RTT (Round trip time)  = RTL (Time require to reach packet from source to destination) + RTA  (Time require to reach packet from destination to source) 




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