US 11,722,395 B2
Inter-autonomous system trace route message
Reji Thomas, Bangalore (IN); and Ronald Bonica, Sterling, VA (US)
Assigned to Juniper Networks, Inc., Sunnyvale, CA (US)
Filed by Juniper Networks, Inc., Sunnyvale, CA (US)
Filed on Oct. 29, 2021, as Appl. No. 17/452,853.
Application 17/452,853 is a continuation of application No. 16/585,294, filed on Sep. 27, 2019, granted, now 11,165,681.
Prior Publication US 2022/0045928 A1, Feb. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 45/741 (2022.01); H04L 43/10 (2022.01); H04L 43/0811 (2022.01); H04L 45/745 (2022.01)
CPC H04L 43/10 (2013.01) [H04L 43/0811 (2013.01); H04L 45/741 (2013.01); H04L 45/745 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
determining, by a first device, that a message received from an upstream device includes first information indicating a path to a second device that generated the message;
modifying, by the first device, the message,
wherein the modifying comprises adding an indication of whether the second device is reachable by the first device, and
wherein the indication is based on a segment identifier;
providing, by the first device, the modified message to a downstream device; and
forwarding, by the first device, based on providing the modified message to the downstream device, and based on the indication, a return message,
wherein forwarding the return message comprises:
forwarding the return message to the upstream device based on determining that the second device is not reachable,
wherein the determination is made based on the indication, or
forwarding the return message to the second device based on determining that the second device is reachable,
wherein the determination is made based on the indication.