IP Library › Granted Patent US 12,507,148
Granted Patent B2
US 12,507,148 · App. 18/234,377 · Granted Dec 23, 2025

Interconnecting clusters in multi-regional large scale deployments with distributed gateways

Inventors: Arun Kumar Srinivasan (Waterloo, CA); Navaneeth Krishnan Ramaswamy (Chennai, IN); Sumit Mundhra (Burnaby, CA); Saravanan Kandasamy (Coimbatore, IN); Balaji Shanmugam (Bengaluru, IN)
Assignee: VeloCloud Networks, LLC
H04W40/125
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Quick Facts
Patent No.
US 12,507,148
App. No.
18/234,377
Granted
Dec 23, 2025
Kind
B2
Abstract

Some embodiments of the invention provide a method for interconnecting hub router clusters in an SD-WAN. The method is performed for each hub router of a first cluster and located in a first of multiple regions connected by the SD-WAN. The method establishes a connection with a respective hub router of a second cluster and located in a second of the multiple regions. The method sends, to a route reflector for the first region connected to the first cluster, a first peer-connection notification identifying the hub router as a next-hop for reaching the respective hub router. For each other hub router of the first cluster, the method receives from the route reflector a second peer-connection notification identifying the other hub router as a next-hop for reaching the other hub router's respective second cluster hub router for use in reaching edge routers connected to each other hub router's respective hub router.

Claims (32)

1 . A method of interconnecting hub router clusters in an SD-WAN (software-defined wide area network), the method comprising:

for each particular hub router belonging to a first hub router cluster of the SD-WAN and located in a first region of a plurality of regions connected by the SD-WAN:

establishing a connection with a respective hub router belonging to a second hub router cluster of the SD-WAN and located in a second region of the plurality of regions connected by the SD-WAN;

sending, to a particular route reflector for the first region to which the first hub router cluster is connected, a first peer-connection notification identifying the particular hub router as a next-hop for reaching the respective hub router of the second hub router cluster; and

for each other hub router belonging to the first hub router cluster, receiving from the particular route reflector a second peer-connection notification identifying the other hub router in the first hub router cluster as a next-hop for reaching the other hub router's respective hub router of the second hub router cluster for use in reaching edge routers connected to each other hub router's respective hub router of the second hub router cluster.

2 . The method of claim 1 , wherein each hub router in the first hub router cluster is connected to at least one hub router in the second hub router cluster and each hub router in the second hub router cluster is connected to at least one hub router in the first hub router cluster.

3 . The method of claim 2 , wherein the first hub cluster has a same number of hub routers as the second hub cluster such that a one-to-one association is created between hub routers of the first hub cluster and hub routers of the second hub cluster.

4 . The method of claim 2 , wherein a number of hub routers belonging to the first hub cluster is greater than a number of hub routers belonging to the second hub cluster.

5 . The method of claim 4 , wherein after each hub router belonging to the second hub cluster has established a connection with a respective hub router belonging to the first hub cluster, the hub routers belonging to the second hub cluster are iterated through and assigned to additional hub routers belonging to the first hub cluster to ensure each hub router in the first hub router cluster has a connection established with a hub router belonging to the second hub cluster.

6 . The method of claim 5 , wherein at least one hub router belonging to the second hub cluster has connections established with at least two hub routers belonging to the first hub cluster.

7 . The method of claim 5 , wherein each hub router belonging to the first hub cluster has a connection established with one hub router belonging to the second hub cluster.

8 . The method of claim 1 , wherein the particular hub router has direct connection established with particular edge router of a particular branch site.

9 . The method of claim 8 , wherein receiving the second peer-connection notification further comprises sending a third peer-connection notification to the particular edge router of the particular branch site with the particular hub router identified as a next hop for reaching the second hub router cluster.

10 . The method of claim 1 , wherein sending the first peer-connection notification to the particular route reflector comprises sending the first peer-connection notification to a set of route reflectors to which the first hub cluster is connected.

11 . The method of claim 10 , wherein each hub router in the first hub cluster has a connection established with at least one respective edge router of at least one respective edge router located in a respective region, wherein each route reflector in the set of route reflectors is associated with a respective region and connected to the at least one respective edge router of the at least one respective edge router located in the respective region.

12 . The method of claim 1 , wherein establishing the connection with the respective hub router belonging to the second hub router cluster comprises establishing an overlay tunnel connection with the respective hub router belonging to the second hub router cluster.

13 . A non-transitory machine readable medium storing a program for execution by a set of processing units, the program for interconnecting hub router clusters in an SD-WAN (software-defined wide area network), the program comprising sets of instructions for:

for each particular hub router belonging to a first hub router cluster of the SD-WAN and located in a first region of a plurality of regions connected by the SD-WAN:

establishing a connection with a respective hub router belonging to a second hub router cluster of the SD-WAN and located in a second region of the plurality of regions connected by the SD-WAN;

sending, to a particular route reflector for the first region to which the first hub router cluster is connected, a first peer-connection notification identifying the particular hub router as a next-hop for reaching the respective hub router of the second hub router cluster; and

for each other hub router belonging to the first hub router cluster, receiving from the particular route reflector a second peer-connection notification identifying the other hub router in the first hub router cluster as a next-hop for reaching the other hub router's respective hub router of the second hub router cluster for use in reaching edge routers connected to each other hub router's respective hub router of the second hub router cluster.

14 . The non-transitory machine readable medium of claim 13 , wherein:

each hub router in the first hub router cluster is connected to at least one hub router in the second hub router cluster and each hub router in the second hub router cluster is connected to at least one hub router in the first hub router cluster; and

the first hub cluster has a same number of hub routers as the second hub cluster such that a one-to-one association is created between hub routers of the first hub cluster and hub routers of the second hub cluster.

15 . The non-transitory machine readable medium of claim 13 , wherein:

each hub router in the first hub router cluster is connected to at least one hub router in the second hub router cluster and each hub router in the second hub router cluster is connected to at least one hub router in the first hub router cluster; and

a number of hub routers belonging to the first hub cluster is greater than a number of hub routers belonging to the second hub cluster.

16 . The non-transitory machine readable medium of claim 15 , wherein after each hub router belonging to the second hub cluster has established a connection with a respective hub router belonging to the first hub cluster, the hub routers belonging to the second hub cluster are iterated through and assigned to additional hub routers belonging to the first hub cluster to ensure each hub router in the first hub router cluster has a connection established with a hub router belonging to the second hub cluster.

17 . The non-transitory machine readable medium of claim 16 , wherein at least one hub router belonging to the second hub cluster has connections established with at least two hub routers belonging to the first hub cluster.

18 . The non-transitory machine readable medium of claim 16 , wherein each hub router belonging to the first hub cluster has a connection established with one hub router belonging to the second hub cluster.

19 . The non-transitory machine readable medium of claim 13 , wherein the particular hub router has direct connection established with particular edge router of a particular branch site, wherein the set of instructions for receiving the second peer-connection notification further comprises a set of instructions for sending a third peer-connection notification to the particular edge router of the particular branch site with the particular hub router identified as a next hop for reaching the second hub router cluster.

20 . The non-transitory machine readable medium of claim 13 , wherein the set of instructions for establishing the connection with the respective hub router belonging to the second hub router cluster comprises a set of instructions for establishing an overlay tunnel connection with the respective hub router belonging to the second hub router cluster.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 5, 2025
From: VMWARE, LLC
To: VELOCLOUD NETWORKS, LLC
Reel/Frame 072326/0693 →
CHANGE OF NAME Recorded Feb 27, 2024
From: VMWARE, INC.
To: VMWARE LLC
Reel/Frame 066692/0103 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 19, 2023
From: SRINIVASAN, ARUN KUMAR; RAMASWAMY, NAVANEETH KRISHNAN; MUNDHRA, SUMIT; KANDASAMY, SARAVANAN; SHANMUGAM, BALAJI
To: VMWARE, INC.
Reel/Frame 064960/0439 →
Continuity (1)
Related Publication 20250063461A1 · Feb 20, 2025
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