US 12,355,659 B2
Ultimate regional fallback path for hierarchical SD-WAN
Jigar Parekh, Fremont, CA (US); Satyajit Das, Livermore, CA (US); Prithvi Sharan, Germantown, MD (US); and Laxmikantha Reddy Ponnuru, San Ramon, CA (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Mar. 7, 2022, as Appl. No. 17/687,821.
Claims priority of provisional application 63/288,080, filed on Dec. 10, 2021.
Prior Publication US 2023/0188460 A1, Jun. 15, 2023
Int. Cl. H04L 45/28 (2022.01); H04L 41/06 (2022.01)
CPC H04L 45/28 (2013.01) [H04L 41/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A network node 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 network node to perform operations comprising:
determining that a first plurality of tunnel interfaces resides in a core region of a network;
determining that a second plurality of tunnel interfaces resides in an access region of the network;
configuring a first tunnel interface as a core regional fallback path for the core region of the network;
configuring a second tunnel interface as an access regional fallback path for the access region of the network;
determining whether to activate the first tunnel interface or the second tunnel interface in response to one or more connectivity losses within the network;
in response to determining that the first plurality of tunnel interfaces loses connectivity to a data plane of the core region of the network, activating, by the network node, the first tunnel interface; and
in response to determining that the second plurality of tunnel interfaces loses connectivity to a data plane of the access region of the network, activating, by the network node, the second tunnel interface, wherein:
the network node is a border router, the border router comprising the first plurality of tunnel interfaces and the second plurality of tunnel interfaces; and
the border router is located at a boundary of the core region and the access region.