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Enabling Interface Link State Monitoring shortens the time it takes ClusterXL to detect an interface failure. By monitoring the link state (i.e. the electrical state) of an interface, ClusterXL is immediately alerted to connectivity issues concerning a certain network interface, such as a disconnected cable, or an electrical failure (real or simulated) on a switch.
Interface Link State Monitoring requires an interface device driver that supports link state detection. The device driver reports the link state as either connected or disconnected.
Monitoring the interface link state is particularly useful in scenarios where a monitored interface (an interface with Network Type Cluster, or Private) sends ICMP ECHO probe requests, which are not answered by hosts or routers on the connected subnet.
When enabled, ClusterXL immediately detects when an interface goes down. When disabled, ClusterXL determines whether an interface is malfunctioning by watching subsecond timeout expiration.
Monitoring Interface Link State is enabled by default.
Note - Interface Link State Monitoring requires an interface device driver that supports link state detection. This feature was tested on two cluster interfaces connected directly with a cross-cable. However, it also works for interfaces connected to a switch. See sk31336.
The global parameter fwha_monitor_if_link_state accepts these values:
To enable or disable Interface Link State Monitoring, run this command:
fw ctl set int fwha_monitor_if_link_state {0|1}
When you run this command, the change is not permanent. The Interface Link State Monitoring setting goes back to its default state when you reboot the member.
To enable or disable Interface Link State Monitoring permanently, see sk26202.
