Experimental (EXP) bits

The Experimental (EXP) bits feature enables you to encode and manage class-of-service (CoS) values within MPLS packet headers as traffic traverses a label-switched path (LSP). EXP classifiers examine the EXP value in the MPLS header to determine CoS settings, while EXP rewrite rules update the EXP bits in outgoing packets to align with downstream network policies. By classifying incoming MPLS packets based on their EXP bits, you can map each packet to a forwarding class and loss priority, ensuring appropriate queue assignment and consistent service levels across the network.