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How are Label Switch Paths built?

April 26, 2017built Label paths Switch

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How are Label Switch Paths built?

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A Label Switch Path (LSP) is a set of LSRs that packets belonging to a certain FEC travel in order to reach their destination. Since MPLS allows hierarchy of labels known as label stack, it is possible to have different LSPs at different levels of labels for a packet to reach its destination. So more formally, a LSP of a packet with a label of level m is a set of LSRs that a packet p has to travel at level m to reach its destination. Please refer to 3.15 of RFC 3031 – Multiprotocol Label Switching Architecture, for a very formal and complete definition.