Configuring an Automatic RSVP-TE Tunnel

Automatic RSVP-TE tunnels are generated using the PCE Initiated LSP protocol. Such tunnels do not need to be manually configured.

Usage Scenario

In an SDN solution, a controller can run the PCE Initiated LSP protocol to generate RSVP-TE tunnels, without manual tunnel configuration. Dynamic RSVP-TE signaling adjusts paths of TE tunnels dynamically based on network changes. To implement reliability functions, such as TE FRR and CR-LSP backup, using RSVP-Te to establish MPLS TE tunnels is recommended.

Pre-configuration Tasks

Before configuring an automatic RSVP-TE tunnel, complete the following tasks:

Configure IS-IS to implement network layer connectivity for LSRs.
Set an LSR ID for each LSR.
Enable MPLS globally and on interfaces on all LSRs.

Enabling MPLS TE and RSVP-TE: Enabling MPLS TE and RSVP-TE on each node and interface in an MPLS domain is the prerequisites for all TE features.

(Optional) Configuring CSPF: CSPF is configured to calculate the shortest path destined for a specified node.

Configuring IGP TE (OSPF or IS-IS): After IGP TE is configured on all LSRs in an MPLS domain, a TEDB is generated on each LSR.

Configuring the Automatic RSVP-TE Tunnel Capability on a PCC: The PCE Initiated LSP protocol needs to be configured for automatic RSVP-TE tunnels. A controller runs this protocol to deliver tunnel and path information to the ingress on which a forwarder resides. Upon receipt of the information, the ingress automatically establishes an RSVP-TE tunnel.

Configuring Dynamic BFD For Initiated RSVP-TE LSP: LSPs that a controller runs the PCE Initiated LSP protocol to establish can only be monitored by dynamic BFD.

Configuring Dynamic BFD for Initiated RSVP-TE Tunnel: RSVP-TE tunnels that a controller runs the PCE Initiated LSP protocol to establish can only be monitored by dynamic BFD.

(Optional) Enabling Traffic Statistics Collection for Automatic Tunnels: A device can be enabled to collect traffic statistics on RSVP-TE tunnels that are established by the PCE Initiated LSP protocol.

Verifying the Automatic RSVP-TE Tunnel Configuration: After configuring an automatic RSVP-TE tunnel, you can check information about the RSVP-TE tunnel and its status statistics.