An explicit path is configured on the ingress of an MPLS TE tunnel to define the nodes through which the MPLS TE tunnel passes and the nodes that are excluded from the MPLS TE tunnel.
The priority values are set on the ingress of an MPLS TE tunnel. Preemption is performed based on the setup and holding priorities during the establishment of an MPLS TE tunnel.
The hop limit set on an ingress is the maximum number of hops on a path along which a CR-LSP is to be established. The hop limit is a constraint used during path selection.
CR-LSP establishment can be associated with the overload setting. This association ensures that CR-LSPs are established over paths excluding overloaded nodes.
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.