MPLS for LSP path selection enhancements

The following enhancements to MPLS have been added for LSP path selection and optimization: â?¢ Earlier when LSP active paths were modified, the LSP path gets cleared and gets resignalled immediately. If a secondary path is available, then Junos OS selects the secondary path as active, clears and resignals the primary path after the expiry of the optimize-hold-dead-delay timer. When the primary LSP path is established, the revert-timer gets started. After the revert-timer expires, the primary LSP path becomes active. If the primary LSP path is not active with revert-timer on and when there is a change to the primary LSP path, then the LSP path gets cleared and resignalled immediately. When the primary LSP path is established, the revert-timer gets restarted. â?¢ Earlier if there was any Constrained Shortest Path First (CSPF) failure then the current LSP path becomes invalid because it did not match with the configured constraints. In this case, the current LSP path gets cleared immediately. If a secondary LSP path is available, then Junos OS selects the secondary LSP path as active and clears the primary path after the expiry of the optimize-hold-dead-delay timer. â?¢ The CLI knob no-bypass-statistics-polling added under the [edit protocols mpls statistics] hierarchy now provides information on bypass LSP statistics. â?¢ A new CLI knob delay has been introduced under the [edit protocols mpls optimize-adaptive-teardown] hierarchy and the value for delay is in the range of (3..65535 seconds). When the adaptive-teardown configuration is triggered, the delay CLI knob further delays the tearing down of old optimized LSP paths based on the configured value.