US 12,273,254 B2
Network node-to-node connectivity verification including data path processing of packets within a packet switching device
Rajagopal Venkatraman, San Jose, CA (US); Rajeev Kumar, Sunnyvale, CA (US); Roberto Mitsuo Kobo, Pleasanton, CA (US); and Vikash Agarwal, San Jose, CA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Jun. 14, 2023, as Appl. No. 18/334,947.
Application 18/334,947 is a continuation of application No. 17/446,965, filed on Sep. 5, 2021, granted, now 11,824,753.
Prior Publication US 2023/0327972 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 43/12 (2022.01); H04L 45/02 (2022.01); H04L 45/74 (2022.01)
CPC H04L 43/12 (2013.01) [H04L 45/02 (2013.01); H04L 45/74 (2013.01)] 20 Claims
OG exemplary drawing
 
9. A packet switching system comprising:
at least one processor; and
at least one memory storing instructions, which when executed by the at least one processor, causes the packet switching system to:
select a first network node to second network node pairing to perform connectivity testing;
configure egress processing towards the first network node to intercept test reply packets;
create a test request packet including at least a source address of the first network node and a destination of the second network node;
inject the test request packet into a data plane processing path, wherein the injecting occurs before ingress processing at the first network node; and
in response to intercepting the test reply packet from the injecting of the test request packet, update a node-to-node connectivity tracking table between the first network node and the second network node and remove or suspend the egress processing towards the first network node.