PRIMECLUSTER Global Link Services Configuration and Administration Guide: Redundant Line Control Function 4.1 (for Linux)

2.4.3 Duplicated operation via NIC switching mode

• One unit of HUB to be connected in NIC switching mode is sufficient, but communication may not be conducted normally if the HUB has MAC learning capabilities. In such a case, add a HUB to make a HUB-to-HUB connection and then connect the cable to each HUB (See "Figure 2.7 System configuration in NIC switching mode" of "2.1.2 NIC switching mode").
• In a standby patrol function of NIC switching mode, a dedicated Ethernet frame is used. Therefore, when operating VLAN (Virtual LAN), occasionally it is not possible to use a standby patrol function depending on the setting of VLAN. In such a case, either stop a standby patrol function or VLAN, or change the setting of VLAN so that it becomes possible to use an optional Ethernet frame.
• In NIC switching mode, it is necessary to use a hub that can be assigned an IP address in order for the hub to be monitored. If a hub cannot be assigned an IP address, an IP address of a device connected to the hub can be monitored. However, it should be noted that if the device whose IP address is monitored fails, the failure is regarded as a transfer route failure.
• If you are using IPv6 virtual interface, you must set "NETWORKING_IPV6=yes" in the /etc/sysconfig/network file. By defining this configuration, the system loads ipv6 module during the system startup.
• When using an IPv6 virtual interface, an radvd daemon is occasionally reactivated not to delay configuring an IPv6 address automatically. A message "radvd[XXXX]: resuming normal operation" is output from the radvd daemon following this, but this is not an error.
• Do not configure the server running NIC switching mode as an IPv6 router.