1-17Configuring MPLS TE Tunnel with Dynamic Signaling ProtocolDynamic signaling protocol can adapt the path of a TE tunnel to network changes and implementredundancy, FRR, and other advanced features.The following describes how to create an MPLS TE tunnel with a dynamic signaling protocol:z Configure MPLS TE properties for links and advertise them through IGP TE extension to form aTEDB.z Configure tunnel constraints.z Use the CSPF algorithm to calculate a preferred path based on the TEDB and tunnel constraints.z Establish the path by using the signaling protocol RSVP-TE or CR-LDP.To form a TEDB, you must configure the IGP TE extension for the nodes on the network to send TELSAs. If the IGP TE extension is not configured, the CR-LSP is created based on IGP routing ratherthan computed by CSPF.Configuration PrerequisitesBefore making the configuration, do the following:z Configure static routing or an IGP protocol to make sure that all LSRs are reachable.z Configure MPLS basic capabilities.z Configure MPLS TE basic capabilities.Configuration ProcedureComplete the following tasks to configure an MPLS TE tunnel using a dynamic signaling protocol:Task RemarksConfiguring CSPF OptionalConfiguring OSPF TEConfiguring IS-IS TERequired when CSPF is configuredChoose one depending on the IGP protocolused.Configuring an MPLS TE explicit path OptionalConfiguring MPLS TE tunnel constraints OptionalEstablishing an MPLS TE tunnel with RSVP-TEOptionalBy default, RSVP-TE is used for establishing anMPLS TE tunnel.Configuring CSPFFollow these steps to configure CSPF:
