When there is insufficient bandwidth to establish a more important LSP, you might want to tear down a less important existing LSP to release the bandwidth. You do this by preempting the existing LSP.
For more detailed information on configuring setup priority and reservation priority for LSPs, see Configuring Priority and Preemption for LSPs.
To configure the bypass LSP’s priority and preemption properties, include the priority statement:
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priority setup-priority reservation-priority;
For a list of hierarchy levels at which you can include this statement, see the statement summary section for this statement.