LSP

label switched path

LSPs support MPLS functions and allow network operators to perform traffic engineering.

There are several types of LSPs:

  • static LSP

  A static LSP specifies a static path. All devices that the LSP traverses must be configured manually with labels. No signaling is required.

  • signaled (dynamic) LSP

  A signaled LSP is set up using a signaling protocol. The signaling protocol facilitates path selection and allows labels to be assigned from an ingress device to an egress device. Signaling is triggered by the ingress router; only the ingress router requires configuration.

  • bypass-only LSP

  A bypass-only LSP has manually configured bypass tunnels on PLR NEs and is used exclusively for bypass protection.

  • segment routing TE LSP

  A segment routing TE LSP is established with trafic engineering and protection requirements based on different parameters, such as hop limit, IGP shortcut , BGP shortcut and maximum segment routing labels.

  • Point-to-Multipoint LSP

  A Point-to-Multipoint LSP allows the source of multicast traffic to forward packets to one or many multicast receivers over a network without requiring a multicast protocol, such as PIM, to be configured in the network.