Network Configurations
Network settings: The Network page contains the Single IP setting, multi-subnet configuration settings, and the external load balancer setting. The Single IP must be configured when a cluster is used but is optional for a single-node installation. The Single IP cannot be the same as other IP addresses that any server uses to run the cluster. Two routing protocols, BGP (Border Gateway Protocol) and OSPF (Open Shortest Path First), allow for multi-subnet configurations. Select a routing protocol to allow using a Single IP from a different subnet for ToolsControl. BGP or OSPF must be configured if nodes are in different subnets on the network, for example, when routers exist in-between the nodes.
Multi subnet: To access multi-subnet options, one of two routing protocols must first be selected. The supported protocols are BGP and OSPF. This choice depends on what technology is supported by routers in the network. Regardless of the chosen option, the configuration needs to match the configuration inside the routers and is done on a per-node basis, meaning that there will be a column for every node in the cluster. When changing the number of nodes, the multi-subnet options also need to be updated. Without doing this, new nodes will not be able to host the Single IP which will degrade the failover.
BGP: When selecting BGP, there are three required fields for each node, router address, and node and router ASN (Autonomous System Number). All fields must be filled in for the settings to take effect and work as intended. The node ASN can be the same for all nodes. The final field, MD5 Password is optional. Together with the router ASN this field needs to match the corresponding router configuration. The router also needs to be configured to handle BGP and have the node address/node ASN configured as a BGP neighbor. BGP allows you to add an optional secondary router.
OSPF: When selecting OSPF, no required fields are needed which is a result of how the protocol works. Two optional fields are available for each node: router address and MD5 password. If the router address is blank, broadcast-based OSPF will be used. Similar to BGP, the password must match the router configuration if it is used.
External Load Balancer: this option requires a cluster environment. When selecting External Load Balancer, no fields appear for configuration.
