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Reroute LSPs

Routing Director uses Path Computation Element Protocol (PCEP) or Network Configuration Protocol (NETCONF) to learn and discover Label-switched Paths (LSPs) in your network.

Routing Director can automatically reroute LSP based on the following predefined parameters that you set at your organization level:

  • Equal-cost multipath (ECMP) placement method—Routing Director adopts ECMP-based rerouting of LSPs to load balance traffic and increase bandwidth by fully utilizing unused bandwidth on links to the same destination.

    You need to set the ECMP Placement Method parameter. Based on the placement method you select (Random, Least-Filled, and Most-Filled), Routing Director evaluates link metrics, and if there are multiple ECMP path available towards the same destination then Routing Director selects a path based on the user settings.

  • Link utilization threshold—Routing Director automatically reroutes LSP when the utilization of a link exceeds a specified threshold, ensuring optimal network performance and preventing congestion. For automatic rerouting of LSPs, you need to set Link Utilization Threshold and Threshold Rerouting Interval parameters.

    For example, if the link utilization threshold is set at 60%, Routing Director immediately reroutes traffic if the link utilization exceeds this value. Even after the rerouting, if the link utilization is more than 60% , then Routing Director waits for the duration you have specified in Threshold Rerouting Interval (e.g., 3 minutes) before rerouting to avoid constant adjustments for transient traffic spikes.

    Note:

    Besides organization-level settings, you can also set the link utilization threshold at the link level. The link-level setting overrides the organization level settings.

  • Path optimization interval—Routing Director ensures LSPs are routed through the most optimal paths. Even if an LSP is rerouted due to threshold crossing, link failure or topology change, the LSP should return to its optimal path once the congestion is resolved. For Routing Director to reroute LSPs through the most optimal paths, you need to set the Path Optimization Interval parameter.

To configure the parameters at your organization level:

  1. Click Settings Menu > System Settings on the banner.

    The Organization Settings page appears.

  2. Configure or modify the following pathfinder settings:
    Parameter Description

    ECMP Placement Method

    Select a placement method for equal-cost multipath (ECMP) routing.

    • Random—Randomly selects one of the ECMP paths
    • Least filled—Selects the path with the maximum available bandwidth
    • Most filled—Selects the path with the minimum available bandwidth

    Based on the placement method you opt, Routing Director evaluates link metrics, distributes traffic, and improves bandwidth utilization on multiple links to the same destination.

    Path Optimization Interval

    Specify the interval after which Routing Director must automatically trigger path optimization. To disable automatic path optimization, enter 0 second.

    Range: 0 through 9 minutes (m), hours (h) or days (d).

    Link Utilization Threshold

    Specify the threshold value (in percentage) for link utilization. When traffic on a link exceeds this value, Routing Director reroutes label-switched path (LSPs). If you do not specify a threshold, the LSP is not rerouted. If you specify 0, the links are blocked.

    Range: 0 through 100 percentage.

    Threshold Rerouting Interval

    Specify the minimum interval (in minutes) after which Routing Director reacts to any traffic or delay violations. If you don’t specify an interval, the label-switched path (LSP) is not rerouted in case of a violation.

    Range: 1 through 300 minutes
  3. Click Save to save the settings.
Verify that the settings are saved and close the Organization Settings page.