Source Packet Routing in Networking (SPRING) or Segment Routing

Compute traffic-engineered path delays using delay metrics (ACX5448, MX480, MX960, MX2010, MX2020, and PTX10008)—Starting in Junos OS Release 21.4R1, you can use delay-based metrics for a Path Computation Element (PCE) to compute traffic engineered paths. You can use delay-based metrics to steer packets on the least latency paths, or the least delay path. To do this, you need to measure the delay on every link and advertise that using a suitable routing protocol (IGP or BGP-LS), so that the ingress has the per link delay properties in its TED.

[See Computing Delay Optimized Intradomain and Interdomain Segment Routing Paths.]