IP Library › Granted Patent US 12,355,655
Granted Patent B2
US 12,355,655 · App. 18/234,376 · Granted Jul 8, 2025

Forwarding packets 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: VMware LLC
H04L45/122H04L45/20
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Quick Facts
Patent No.
US 12,355,655
App. No.
18/234,376
Granted
Jul 8, 2025
Kind
B2
Abstract

Some embodiments of the invention provide a method for forwarding packets through an SD-WAN. The method is performed at a route reflector that advertises routes to facilitate forwarding of packets between first and second regions of the SD-WAN. The method advertises (1) to a first set of edge routers in the first region, a first route identifying a next-hop first hub router for initiating communications with a second set of edge routers in the second region, and (2) to the second set of edge routers, a second route identifying a next-hop second hub router for initiating communications with the first set of edge routers. When the second hub router loses connectivity to a first edge router of the first set of edge routers, the method advertises to the second set of edge routers a third route identifying the next-hop first hub router for initiating communications with the first edge router.

Claims (57)

1. A method for forwarding packets through an SD-WAN (software-defined wide area network), the method comprising:

at a route reflector that advertises routes to facilitate forwarding of packets from a first region of the SD-WAN to a second region of the SD-WAN, and from the second region of the SD-WAN to the first region of the SD-WAN, said first region having a first hub router forwarding packets between a first set of edge routers of a first set of sites of the first region, and said second region having a second hub router for forwarding packets between a second set of edge routers of a second set of sites of the second region:

advertising, to the first set of edge routers in the first region, a first route that identifies the first hub router as a next hop for use in initiating communications with the second set of edge routers in the second region;

advertising, to the second set of edge routers in the second region, a second route that identifies the second hub router as a next hop for use in initiating communications with the first set of edge routers in the first region;

from the second hub router, receiving a notification that the second hub router has lost connectivity to a first edge router of the first set of edge routers of the first region; and

based on the notification, advertising to the second set of edge routers a third route that identifies the first hub router as a next-hop for initiating communications with the first edge router in the first region.

2. The method of claim 1 , wherein after receiving the third route that identifies the first hub router as the next-hop for initiating communications with the first edge router in the first region, the second set of edge routers (i) use the third route with the first hub router as the next-hop for initiating communications with the first edge router in the first set of edge routers of the first region and (ii) continue to use the second route with the second hub router as the next-hop for initiating communications with each other edge router in the first set of edge routers in the first region.

3. The method of claim 2 , wherein the notification is a first notification, the method further comprising:

receiving, from the second hub router, a second notification that the second hub router has reestablished connectivity to the first edge router; and

based on the second notification, advertising to the second set of edge routers the second route that identifies the second hub router as the next hop for use in initiating communications with the first set of edge routers in the first region including the first edge router.

4. The method of claim 3 , wherein after advertising the second route that identifies the second hub router as the next hop for use in initiating communications with the first set of edge routers in the first region including the first edge router, the second set of edge routers in the second region use the second route with the second hub router as the next hop for initiating communications with all edge routers in the first set of edge routers.

5. The method of claim 1 , wherein the first route represents routes of each edge router in the second set of edge routers as a single summarized first route and the second route represents routes of each edge router in the first set of edge routers as a single summarized second route.

6. The method of claim 5 , wherein advertising the first route to the first set of routers and advertising the second route to the second set of routers reduces a number of routes advertised to and stored by edge routers in the first and second sets of edge routers.

7. The method of claim 1 , wherein the notification is a first notification, the method further comprising:

receiving a second notification from the second hub router that the second hub router has lost connectivity to a second edge router in the second set of edge routers; and

based on the notification, advertising to the first set of edge routers a fourth route that identifies the second hub router as a next hop for initiating communications with the second edge router in the second region.

8. The method of claim 1 , wherein:

the first hub router is (i) a primary hub router for the first set of edge routers and (ii) a secondary hub router for the second set of edge routers; and

the second hub router is (i) a primary hub router for the second set of edge routers and (ii) a secondary hub router for the first set of edge routers.

9. The method of claim 8 , wherein:

when an edge router in the first set of edge routers loses connectivity with the first hub router, the edge router in the first set of edge routers uses the second hub router to initiate communications with the second set of edge routers; and

when an edge router in the second set of edge routers loses connectivity with the second hub router, the edge router in the second set of edge routers uses the first hub router to initiate communications with the first set of edge routers.

10. The method of claim 1 , wherein:

the route reflector is a set of route reflectors comprising at least a first route reflector and a second route reflector;

the first route reflector is directly connected to the first set of edge routers and to the first and second hub routers; and

the second route reflector is directly connected to the second set of edge routers and to the first and second hub routers.

11. The method of claim 10 , wherein:

each of the first and second route reflectors receive the notification from the second hub router that the second hub router has lost connectivity to the first edge router of the first set of edge routers of the first region; and

said advertising of the third route is performed by the second route reflector.

12. A non-transitory machine readable medium storing a program for execution by a set of processing units, the program for forwarding packets through an SD-WAN (software-defined wide area network), the program comprising sets of instructions for:

at a route reflector that advertises routes to facilitate forwarding of packets from a first region of the SD-WAN to a second region of the SD-WAN, and from the second region of the SD-WAN to the first region of the SD-WAN, said first region having a first hub router forwarding packets between a first set of edge routers of a first set of sites of the first region, and said second region having a second hub router for forwarding packets between a second set of edge routers of a second set of sites of the second region:

advertising, to the first set of edge routers in the first region, a first route that identifies the first hub router as a next hop for use in initiating communications with the second set of edge routers in the second region;

advertising, to the second set of edge routers in the second region, a second route that identifies the second hub router as a next hop for use in initiating communications with the first set of edge routers in the first region;

from the second hub router, receiving a notification that the second hub router has lost connectivity to a first edge router of the first set of edge routers of the first region; and

based on the notification, advertising to the second set of edge routers a third route that identifies the first hub router as a next-hop for initiating communications with the first edge router in the first region.

13. The non-transitory machine readable medium of claim 12 , wherein after receiving the third route that identifies the first hub router as the next-hop for initiating communications with the first edge router in the first region, the second set of edge routers (i) use the third route with the first hub router as the next-hop for initiating communications with the first edge router in the first set of edge routers of the first region and (ii) continue to use the second route with the second hub router as the next-hop for initiating communications with each other edge router in the first set of edge routers in the first region.

14. The non-transitory machine readable medium of claim 13 , wherein the notification is a first notification, the program further comprising sets of instructions for:

receiving, from the second hub router, a second notification that the second hub router has reestablished connectivity to the first edge router; and

based on the second notification, advertising to the second set of edge routers the second route that identifies the second hub router as the next hop for use in initiating communications with the first set of edge routers in the first region including the first edge router.

15. The non-transitory machine readable medium of claim 14 , wherein after advertising the second route that identifies the second hub router as the next hop for use in initiating communications with the first set of edge routers in the first region including the first edge router, the second set of edge routers in the second region use the second route with the second hub router as the next hop for initiating communications with all edge routers in the first set of edge routers.

16. The non-transitory machine readable medium of claim 12 , wherein:

the first route represents routes of each edge router in the second set of edge routers as a single summarized first route;

the second route represents routes of each edge router in the first set of edge routers as a single summarized second route; and

advertising the first route to the first set of routers and advertising the second route to the second set of routers reduces a number of routes advertised to and stored by edge routers in the first and second sets of edge routers.

17. The non-transitory machine readable medium of claim 12 , wherein the notification is a first notification, the program further comprising sets of instructions for:

receiving a second notification from the second hub router that the second hub router has lost connectivity to a second edge router in the second set of edge routers; and

based on the notification, advertising to the first set of edge routers a fourth route that identifies the second hub router as a next hop for initiating communications with the second edge router in the second region.

18. The non-transitory machine readable medium of claim 12 , wherein:

the first hub router is (i) a primary hub router for the first set of edge routers and (ii) a secondary hub router for the second set of edge routers; and

the second hub router is (i) a primary hub router for the second set of edge routers and (ii) a secondary hub router for the first set of edge routers.

19. The non-transitory machine readable medium of claim 18 , wherein:

when an edge router in the first set of edge routers loses connectivity with the first hub router, the edge router in the first set of edge routers uses the second hub router to initiate communications with the second set of edge routers; and

when an edge router in the second set of edge routers loses connectivity with the second hub router, the edge router in the second set of edge routers uses the first hub router to initiate communications with the first set of edge routers.

20. The non-transitory machine readable medium of claim 12 , wherein:

the route reflector is a set of route reflectors comprising at least (i) a first route reflector that is directly connected to the first set of edge routers and to the first and second hub routers, and (ii) a second route reflector that is directly connected to the second set of edge routers and to the first and second hub routers;

each of the first and second route reflectors receive the notification from the second hub router that the second hub router has lost connectivity to the first edge router of the first set of edge routers of the first region; and

the set of instructions for said advertising of the third route is performed by the second route reflector.

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 064960/0422 →
Continuity (1)
Related Publication 20250062979A1 · Feb 20, 2025
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