/cfg/l3/ha/service/trigger
Failover Trigger Menu
Alteon performs failover based on the availability of its failover triggers (interfaces, gateways, trunks, or real servers). Failover occurs when one Alteon in an HA pair has fewer available resources than the other.
Configure the active switch/group on the primary Alteon before you configure the backup Alteon. After configuring the primary, you can synchronize the configuration with the backup Alteon. If you configure the backup Alteon before the primary, a failover might occur. The backup switch/group will take control since its “priority” will be higher.
To avoid a failover when adding tracking, first add the trigger to the active Alteon, and then to the backup Alteon.
To avoid a failover when removing tracking, first remove the trigger from the backup Alteon, and then from the active Alteon.
The following triggers are supported:

IP interfaces (always enabled) — Port failure causes failover, even when the port belongs to a trunk that is still operational.
Alteon only tracks interfaces belonging to the specified group (according to the floating IP addresses attached to the group).

Gateways — When enabled, Alteon tracks all selected configured gateways. Gateway failure causes failover.

Real servers — When a server does not respond, Alteon removes it from the calculation of available resources.
Note: If one or more tracked real servers becomes unavailable, an unexpected failover can occur if the health check sent from the backup switch precedes the health check sent from the primary, and vice versa when the servers become available again.

Ports — When the number of operational ports is less than the number of ports defined in the failover criteria.

VIPs — When the virtual service of a VIP is down, the primary Alteon stops sending Gratuitous ARP (GARP) messages to advertise that VIP.

Groups — You can track real server groups.
Set failover triggers with the following commands:

In Switch HA mode —
/cfg/l3/ha/switch/trigger.

In Service HA mode —
/cfg/l3/ha/service/group 1/trigger.
[Service 1 Failover Trigger Menu] gwtrck - Gateway tracking menu ifs - Interface tracking menu realsrv - Real servers tracking menu group - Group Tracking Menu vip - VIP tracking menu cur - Display current failover trigger configuration |