US 11,909,645 B2
Segment routing traffic engineering based on link utilization
Darek Skalecki, Ottawa (CA); and Gerard L. Swinkels, Ottawa (CA)
Assigned to Ciena Corporation, Hanover, MD (US)
Appl. No. 16/958,991
Filed by Ciena Corporation, Hanover, MD (US)
PCT Filed Jan. 24, 2019, PCT No. PCT/US2019/014861
§ 371(c)(1), (2) Date Jun. 29, 2020,
PCT Pub. No. WO2019/152247, PCT Pub. Date Aug. 8, 2019.
Application 16/958,991 is a continuation of application No. 15/888,333, filed on Feb. 5, 2018, granted, now 10,541,923, issued on Jan. 21, 2020.
Prior Publication US 2020/0366613 A1, Nov. 19, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 47/122 (2022.01); H04L 47/11 (2022.01); H04L 43/0882 (2022.01); H04L 45/50 (2022.01); H04L 45/00 (2022.01); H04L 47/125 (2022.01); H04L 47/35 (2022.01)
CPC H04L 47/122 (2013.01) [H04L 43/0882 (2013.01); H04L 45/34 (2013.01); H04L 45/50 (2013.01); H04L 45/70 (2013.01); H04L 47/11 (2013.01); H04L 47/125 (2013.01); H04L 47/35 (2013.01); H04L 45/22 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A Label Edge Router (LER) in a Segment Routing (SR) network configured to perform SR Traffic Engineering (SR-TE), the LER comprising:
circuitry configured to:
receive link utilization measurements flooded by one or more Label Switch Routers (LSRs)
wherein the link utilization measurements are for links associated with one or more SR tunnels;
determine whether the one or more SR tunnels are congested, based on one or more of an unreserved bandwidth, a maximum reservable bandwidth, and a maximum bandwidth of corresponding links, where a given SR tunnel is determined to be congested based on one or more of (1) a negative value of the unreserved bandwidth, (2) the maximum reservable bandwidth being greater than the maximum bandwidth, and (3) the maximum reservable bandwidth being equal to the maximum bandwidth; and
perform one or more routing actions for the one or more SR tunnels based on the determination.