Dual-host considerations for Radware link Load Balancing

 

Topology description: 

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Network Description:Four public network lines are connected at the network egress. For example, two egress firewalls are used as HA and the egress address of the firewall is the address of CERNET. That is, VLAN should be enabled for the access port of the Radware LP Load Balancing Device CERNET; therefore, pay attention to the following issues when performing high availability for the two LP servers. The VRRP-based mode is introduced here;   Requirements:The two LP models must be the same and the same software version is required. For function licenses such as BWM, IPS can be ignored, and the memory size can be ignored, but the throughput should be the same. The software version implemented here is ODS2 6.12.02, the latest software version Problem description:1. After VRRP is enabled, it is found that the VLAN interfaces of the master device cannot be UP but the physical status is UP. 2. The VLAN interfaces of the LP are not very stable and are valid during time periods; Solution:1. When VRRP is enabled, the main device must enable Interface Grouping. This option is used to check the port running status of the device. When a port is DOWN, this mechanism forces other ports to be DOWN. Therefore, when VRRP is enabled for VLAN interfaces, all VLAN interfaces must be UP so that VLAN is activated. Interface GroupingTo provide a complete solution for redundancy against all failures, LinkProof employs a mechanic called Interface Grouping. if LinkProof notices that one of its physical ports is down, it intentionally brings all other active ports down. when a physical port on LinkProof goes down, because of a cable failure, switch port failure, hub failure, or other problems, LinkProof performs the following tasks:

1.	LinkProof examines the configuration to see if any IP addresses were configured on the port that just went down.
2.	If there were IP addresses configured on the port that went down, LinkProof deactivates all other active ports.

3.	If there were no IP addresses configured on the port that went down, nothing happens and normal operation continues.

>	Using Regular VLAN, when any of the ports associated with a VLAN is down, Interface Grouping is triggered.
>	Using Switched ip vlan, Interface Grouping is triggered only when all ports on a Switched ip vlan are down.

>	When using VLAN with interface groupings, a group may go down as a result of a failing interface. in such an event, all traffic to the interfaces belonging to the group will be discarded including management traffic.

2. We can see from the topology that such deployment involves loops, which may be caused by unstable lp vlan interfaces, however, you can use the Backup-In-Vlan option In the global settings of VRRP to solve this problem. If the status is set to BACKUP, the Standby device does not process any traffic. Master Device Configuration

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Backup Device Configuration

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Global Parameters

 

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