I have setup the network as shown in the attached topology.
The two Barracuda Load Balancers have been deployed in bridge mode meaning that they are each configured with only one physical IP address.
They have been configured to operate in an Active-Standby mode whereby the WAN port of each Load Balancer is connected to Switch A and the LAN port of each Load balancer is connected to Switch B. The Load balancers communicate and monitor each other by sharing a secret cluster password.
In this setup all traffic going to/coming from the servers need to pass through the Load Balancers.The network on both sides of the Load Balancers (WAN and LAN ports) have the same IP addressing which is 172.22.92.0/24.
The setup works fine but at some times, a loop occurs in the network and this brings the network completely down where no device can be reached.
This usually occurs when plugging in the second Load Balancer or when modifying the configuration of the Active Load Balancer.
Please find attached the topology, configurations and errors generated.
I have used spanning-tree portfast on Switch A ports to lessen the time it takes for the Backup Load Balancer to discover that the Active Load Balancer is no longer operating correctly.
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