Disabling CSPF Path Calculations

By default, Constrained Shortest Path First (CSPF) is enabled for signaled LSP calculations. When the device is the ingress LER for the LSP, it uses the information in the TED to help determine a path for the LSP.

To disable the constraint-based path selection for LSP tunnel1, complete the following steps.

Enable the device for configuration.
```
device# configure
```
Enable the MPLS router.
```
device(config)# router mpls
```
Enable and configure the label switched path (LSP).
```
device(config-router-mpls)# lsp tunnel1
```
In this example, the selected LSP is named tunnel1.

Disable CSPF.

device(config-router-mpls-lsp-tunnel1)# no cspf

Example

The following example disables the constraint-based path selection for LSP tunnel1.

device# configure 
device(config)# router mpls
device(config-router-mpls)# lsp tunnel1
device(config-router-mpls-lsp-tunnel1)# no cspf