The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2026
Filed:
Jun. 09, 2023
Cisco Technology, Inc., San Jose, CA (US);
Avinash Shah, Pleasanton, CA (US);
Ganesh Devendrachar, Milpitas, CA (US);
Arul Murugan Manickam, San Jose, CA (US);
Laxmikantha Reddy Ponnuru, San Ramon, CA (US);
Satyajit Das, Lake Tapps, WA (US);
Pritam Baruah, Fremont, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
Techniques are described for detecting a change in Path Maximum Transfer Unit (PMTU) in a network and initiating a PMTU discovery process. A Bidirectional Forwarding Detection (BFD) data packet is generated having enhanced headers configured to record a largest packet sent value and a largest packet received value. The BFD data packet is sent from a first network device (such as a first router) to a second network device (such as a second router). A largest packet sent value and a largest packet received value are each recorded in the BFD data packet. If the largest data packet sent value is larger than the largest data packet received value, then a determination can be made that a path change has resulted in a reduction in PMTU which has resulted in either a data packet being fragmented, a data packet being dropped or both. A PMTU discovery can then be performed.