What are the reasons for the static LSP's failure in becoming Up

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A static LSP is classified into the common static LSP, static LSP bound to the tunnel, and static CR-LSP bound to the tunnel.

Switches of V200R002C00 or later support MPLS TE.

Each node checks the command configuration of a common static LSP. The common static LSP fails to be configured in any of the following situations:
MPLS is not enabled globally.
The static LSP with the same name exists.
The static LSP with the same destination address and the same outbound interface (next hop) exists.
The static LSP with the same incoming label exists.
The configured next hop address is not the actual next hop address in the routing table.
Each node checks the command configuration of a static LSP bound to the tunnel. The static LSP bound to the tunnel fails to be configured in any of the following situations:
MPLS is not enabled globally.
MPLS TE is not enabled globally.
On the ingress node, the bound tunnel does not exist or is not configured.
The static LSP with the same name exists.
The static LSP with the same destination address and the same outbound interface (next hop) exists.
The static LSP with the same incoming label exists.
The configured next hop address is not the actual next hop address in the routing table.
Each node checks the command configuration of a static CR-LSP bound to the tunnel. The static CR-LSP bound to the tunnel fails to be configured in any of the following situations:
MPLS is not enabled globally.
MPLS TE is not enabled globally.
On the ingress node, the bound tunnel does not exist or is not configured.
The static LSP with the same name exists.
The static LSP with the same destination address and the same outbound interface (next hop) exists.
The static LSP with the same incoming label exists.
The configured next hop address is not the actual next hop address in the routing table.

Other related questions:
What is the difference between the static LSP bound to the tunnel and the static CR-LSP
Switches of V200R002C00 or later support the static CR-LSP. A static LSP is classified into the common LSP and static LSP bound to the tunnel. A static CR-LSP must be bound to the tunnel. A static CR-LSP requires bandwidth while a common static LSP does not require.

Why cannot an LSP session become Up after a TCP connection is established
After a TCP connection is established, the two ends of the TCP connection negotiate parameters such as label distribution mode (DU or DoD). If negotiation fails, the LSP session cannot become Up.

How to configure static LSPs on S series switches
For static LSP configuration on S series switches (except the S1700), see "CLI-based Configuration > Configuration Guide - MPLS > Static LSP Configuration > Configuration Examples > Example for Configuring Static LSPs" in S7700&S9700 V200R010C00 Product Documentation. Configurations on different models are the same, and configurations on the S7700 and S9700 are used as examples.

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