Link status monitoring function monitors the link status of interfaces regularly and detects link down and link up failures.
When the link status monitoring function detects link down of an interface at the operation side, if the interface at the standby side is available, the communication path is immediately switched.
Figure 2.1 Link status monitoring function
Note
When the virtual NIC is generated at OS startup, the physical NICs are connected to the virtual interface. At this time, if the physical NICs are not ready to link up, the error message number 904 is output to the system log. After that, if the message number 903 is output, no action is required. If the message 903 is not output, check the link status of the physical NICs bundled by the virtual NIC.
The error message number 904 is output both when Link Status Propagation of the virtual NIC is enabled or disabled.
ERROR: 90400: link down detected: the virtual interface link is down.(virtual-interface)INFO: 90300: link up detected: the virtual interface link is up.(virtual-interface)