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Reroute LSPs Overview

Paragon Automation uses Path Computation Element Protocol (PCEP) or Network Configuration Protocol (NETCONF) to learn about Label-switched Paths (LSPs) in the discovered network topology. You can configure Paragon Automation to automatically reroute LSPs.

The parameters that trigger LSP rerouting are link-utilization-threshold, packet-loss-threshold and reroute-minimum-interval that can be configured on the Analytics tab of the PathFinder Settings page (Configuration > Network Settings) and Maximum delay in the Constraints tab when you add a single LSP. These parameters are applied to all links in the network.

For LSP rerouting based on link utilization (bandwidth), you can specify a minimum reroute interval (in minutes) and a link utilization threshold (%). The reroute interval is used to pace successive rerouting events. For more information, see Analytics in Modify PathFinder Settings From GUI or Maximum delay in Add a Single Tunnel.

LSPs are rerouted when both of the following conditions are true:

  • A link utilization threshold has been crossed. To avoid unnecessary network churn, Paragon Automation only considers rerouting an LSP with traffic or a bandwidth reservation when the link utilization threshold has been crossed.
  • No previous rerouting processes have occurred within the defined reroute interval.

When a threshold has been crossed, LSPs with a lower priority setting and higher traffic are the first to be rerouted, before LSPs with a higher priority setting and lower traffic. If LSP traffic data is available, Paragon Automation uses it over bandwidth reservation for determining whether an LSP should be re-routed. If LSP traffic data is not available, Paragon Automation considers LSP bandwidth reservation to make the determination.

You can override global thresholds with link-specific thresholds. To set link-specific thresholds, you can edit the link parameters (constraints) for each link listed under the Link tab of the network information table in the Topology page (Network > Topology). For more information, see Edit Link Parameters.