MPLS ConceptsLabel Switched Path (LSP)

• LSP defines the path through LSRs from ingress to egress:

  • FEC is determined at LSR-ingress
  • LSPs are unidirectional
  • LSPs are derived from IGP (and other means)
  • LSPs may deviate from IGP shortest path
  • LSPs start at aggregation points

Ingress-LSR

Egress-LSR

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