Network monitoring function detects switch hangs and communication path failures between switches.
Monitoring daemons periodically exchange heartbeat messages between redundant NICs so that the network monitoring function can monitor the network status. If no heartbeat messages are exchanged, the virtual NICs select optimum NICs for each communication targets among the grouped multiple NICs and this enables the reliable communication.
By default, it takes about 10 seconds to detect heartbeat failures.
Figure 2.2 Network monitoring function
Information
The monitoring is shared in the virtual interface which bundles the same physical NIC in the same order.
When the virtual interface state is "inactive", startup of the monitoring is suspended. After the virtual interface is activated, the monitoring is started.
The function monitors a route of the non-tagged VLAN, not the tagged VLAN.
