If a failure occurs in the Ethernet switch that is carrying active call data, each system component detects the failure and switches its links to the other Ethernet switch so no data is lost.
The Linux bonding driver provides an Ethernet port switchover function. Two Ethernet ports, preferably on different Ethernet cards in the same node, have identical Ethernet address. The bonding driver operates in active/standby mode.
For geographically separated configurations, failure of both Ethernet switches at a particular site causes the partner node to take over after consultation with the survival authority.
Parent topic: Cluster Redundancy