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Add and Remove LSP Delegation

You can use the Configure LSP Delegation page (Observability > Network > Topology > Tunnel tab > Delegation > Configure Delegation) to delegate the management of Path Computation Client-controlled label-switched paths (PCC-controlled LSPs) to the Path Computation Element (PCE). After delegation, these LSPs are managed by the PCE and are classified as PCC-delegated LSPs. You can also return the control of these LSPs to the PCC by removing the delegation, and these LSPs are then re-classified as PCC-controlled LSPs.

Understand the Behavior of Delegated and Undelegated LSPs

In both standalone (where the Routing Director components run on a single primary node) and high availability (HA) cluster configurations (where the Routing Director components run on multiple primary nodes), whenever a Path Computation Element Protocol (PCEP) session on a PCC goes down, all the LSPs that originated from that PCC are removed from the database, except those LSPs with parameters configured from the GUI.

For PCC-controlled LSPs, all the configuration changes made to the LSP attributes from the router (that is, the PCC) are stored only in the router’s configuration file. When you delegate such LSPs to the PCE and change the LSP attributes from the GUI, the changes are stored only in the database. The PCE communicates the changes to the PCC by using PCEP.

You can still make changes to the LSP attributes from the router and these changes are stored in the router’s configuration file, but the changes do not take effect as long as the LSPs remain delegated to the PCE.

The configuration changes made from the PCC take effect automatically only after the LSPs are undelegated from the PCE, which means that the control of the LSPs is returned to the PCC. After undelegation, the PCE obtains the LSP state from the PCEP report messages. If you change the LSP attributes from the router and the PCE isn’t available at this time, the PCE obtains the latest LSP state after it becomes available. Therefore, if you delegate such LSPs to the PCE, the LSPs carry the latest state.

If you perform the Undelegate operation on a delegated LSP, the Path Computation Server (PCS) uses the bandwidth reported by the device for the planned bandwidth instead of the user input value.

Add LSP Delegation

To delegate one or more LSPs to the PCE:

  1. Navigate to Observability > Network > Topology > Tunnel tab > Delegation > Configure Delegation. The Configure Delegation page is displayed.
  2. From the Add Delegation tab, select the LSPs that you want to delegate to the PCE.

    To select all the available LSPs for delegation, click the check-box beside the Name column.

  3. Click Delegate LSP.

    A confirmation message appears on the top of the page indicating that the LSP delegation was requested.

    The lsp-external-controller pccd statement is added to the router configuration and the LSPs are delegated to the PCE.

    The Control Type column in the Tunnel tab (Topology > Tunnel) of the network information table displays Delegated for the selected LSPs.

    Note:

    • If there is a failure along the path, the PCE reroutes the delegated LSPs (RSVP LSPs and SR LSPs with a single primary path) around the failed network element.

    • When the PCE doesn’t find a path for the delegated SR LSP, the PCE sends a PCEP message to the PCC with an empty explicit route object (ERO). The PCC then sets the LSP's operational status as Down and sends a PCEP message to the PCE indicating that the LSP's operational status is Down. Later, when the PCE computes a path for the LSP, the PCE sends a PCEP message to the PCC, with the ERO. The PCC then provisions the ERO and sends a PCEP message to the PCE indicating that the LSP's operational status is now Up.

      The empty ERO feature for delegated SR LSPs and delegated RSVP LSPs is supported only for Juniper Networks PCC devices and this feature has not been tested with other PCC devices. For delegated SR LSPs, this feature is supported only on Juniper Networks PCC devices running Junos OS Release 20.4R1 or later.

Remove LSP Delegation

To undelegate one or more LSPs from the PCE:

  1. Navigate to Observability > Network > Topology > Tunnel tab > Delegation > Configure Delegation. The Configure Delegation page is displayed.
  2. From the Remove Delegation tab, select the LSPs that you want to undelegate.

    To select all the available LSPs for undelegation, click the check-box beside the Name column.

  3. Click Undelegate LSP.

    A confirmation message appears on the top of the page indicating that the LSP delegation change was requested.

    The delegation statement is removed from the router configuration and the control of these LSPs is returned to the PCC.

    The Control Type column in the Tunnel tab (Topology > Tunnel) of the network information table displays Device Controlled for the selected LSPs.