US 12,068,886 B2
Systems and methods for providing SD-WAN fabric connectivity over IPv6 transit networks via an automatic IPv4 over IPv6 tunnel
Changhong Shen, Shanghai (CN); Ruozhong Xuan, San Ramon, CA (US); Sampath Kumar Sthothra Bhasham, Santa Clara, CA (US); and Vincent Li, San Jose, CA (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Aug. 5, 2022, as Appl. No. 17/817,775.
Claims priority of provisional application 63/331,912, filed on Apr. 18, 2022.
Prior Publication US 2023/0336376 A1, Oct. 19, 2023
Int. Cl. H04L 12/46 (2006.01); H04L 45/74 (2022.01); H04L 61/251 (2022.01); H04L 61/5014 (2022.01); H04L 67/141 (2022.01)
CPC H04L 12/4633 (2013.01) [H04L 45/74 (2013.01); H04L 61/251 (2013.01); H04L 61/5014 (2022.05); H04L 67/141 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A first network element comprising one or more processors and one or more computer-readable non-transitory storage media coupled to the one or more processors and including instructions that, when executed by the one or more processors, cause the first network element to perform operations comprising:
acquiring an Internet Protocol version 6 (IPv6) address for a physical interface of the first network element;
configuring an Internet Protocol version 4 (IPv4) over IPv6 tunnel between the first network element and a second network element using the physical interface of the first network element;
acquiring an updated IPv6 address for the physical interface of the first network element;
using an IPv6 Service Level Agreement (SLA) Hypertext Transfer Protocol (HTTP) operation to notify the second network element of the updated IPv6 address to establish a bidirectional IPv4 over IPv6 tunnel;
configuring a loopback interface;
assigning the loopback interface an IPv4 address;
configuring an overlay tunnel using the loopback interface, wherein the overlay tunnel is a software-defined wide area network(SD-WAN) overlay tunnel; and
binding the SD-WAN overlay tunnel to the IPv4 over IPv6 tunnel.