The switching and deletion delays are set to ensure that a CR-LSP is torn down only after a new CR-LSP has been established, which prevents traffic interruption.
MPLS TE uses a make-before-break mechanism. If attributes of an MPLS TE tunnel, such as bandwidth or path change, a new CR-LSP with new attributes is established. Such a CR-LSP is called a modified CR-LSP. The new CR-LSP must be established before the original CR-LSP, also called the primary CR-LSP, is torn down. This prevents data loss and additional bandwidth consumption during traffic switching.
If a forwarding entry associated with the new CR-LSP does not take effect after the original CR-LSP has been torn down, a temporary traffic interruption occurs.
The switching and deletion delays can be set on the ingress of the CR-LSP to prevent the preceding problem.
The system view is displayed.
The MPLS view is displayed.
The switching time and deletion delay time are set.
The configuration is committed.