This section provides an example of an SLB failover. In this example, the SLB group used has three active nodes and one standby node as follows:
SLB Group #0 Virtual IP: 10.10.10.0/24 Server Members: IP Address Vlan MacAddress Port State Comments ================ ==== ================= ==== ========= ================== 192.0.0.1 3 00:1b:21:53:6e:e0 9 ACTIVE 192.0.0.2 3 00:1b:21:53:6f:00 9 ACTIVE 192.0.0.3 3 00:3e:16:20:12:01 9 ACTIVE 192.0.0.4 3 00:3e:15:18:05:30 9 STANDBY (up)
In the SLB active/standby configuration, each failed node requires a standby node for failover (a one-to-one relationship). When all standby nodes are taken due to multiple active node failures, the next failed node will remain in the failed state, and traffic to that node will not be redirected.
For a standby node to replace a failed node (changing the state from standby to failover), the node must be reachable from the switch (marked by the up statement in the Comments column.