	US 12,445,521 B2
	Load balancing using multiple active session zones
Yongxiang Dai, Hefei (CN); Yong Yang, San Jose, CA (US); and Hongjian Zhao, Campbell, CA (US)
Assigned to Zoom Communications, Inc., San Jose, CA (US)
Filed by Zoom Communications, Inc., San Jose, CA (US)
Filed on Jul. 6, 2023, as Appl. No. 18/348,044.
Application 18/348,044 is a continuation of application No. 17/345,956, filed on Jun. 11, 2021, granted, now 11,785,077.
Application 17/345,956 is a continuation of application No. PCT/CN2021/091145, filed on Apr. 29, 2021.
Prior Publication US 2023/0353632 A1, Nov. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 12/24 (2006.01); H04L 41/0803 (2022.01); H04L 65/1046 (2022.01); H04L 65/1066 (2022.01); H04L 65/80 (2022.01); H04L 67/1029 (2022.01); H04L 67/1034 (2022.01)

CPC H04L 67/1034 (2013.01) [H04L 65/1046 (2013.01); H04L 65/1066 (2013.01); H04L 65/80 (2013.01); H04L 67/1029 (2013.01)]

20 Claims

1. A system comprising:

a first and second load balancer circuit, wherein the first and second load balancer circuits are associated with a first active session zone at a datacenter, and wherein the first active session zone comprises two active call switches and one standby call switch;

a third and fourth load balancer circuit, wherein the third and fourth load balancer circuits are associated with a second active session zone at the datacenter, wherein the second load balancer circuit and the fourth load balancer circuit are standby load balancers; and

a cache controller circuit configured to:

synchronize session state data between a first cache comprising first session state data associated with the first active session zone and a second cache comprising second session state data associated with the second active session zone; and

failover from the first active session zone to the second active session zone during a failure event at the first active session zone such that ongoing sessions are continued at the second active session zone without interruption.