PRIMECLUSTER Global Link Services Configuration and AdministrationGuide 4.3Redundant Line Control Function

3.1.1 Selecting mode

Determine which mode to use. Table 3.1 Selection of modes indicates the selection of modes.

For selecting adequate mode, refer to "1.1.2 Criteria for selecting redundant line control methods".

Table 3.1 Selection of modes

Mode	Selecting mode
Fast switching mode	Select this mode if every one of the remote hosts uses Fast switching mode. This mode can detect the abnormalities of the multiplexed transfer route immediately. When abnormalities are detected, communication can be immediately changed to a normal transfer route.
NIC switching mode	Select this mode, if a hot-standby router, a network load balancer, or servers and other various network devices from other manufacturers are used. Select this mode in most cases.
Virtual NIC mode	Select this mode in the following cases: - A Linux server is placed on a network where a hot-standby router, a network load balancer, or servers and other various network devices from other manufacturers are used. - Multicast communication or IPv6 is used. - Communication of a guest OS is duplicated on the host OS when the virtual machine function is used.
GS linkage mode	Select this mode if a transfer route is multiplexed between GS, PRIMEQUEST, or PRIMERGY.

It is possible to create multiple virtual interfaces in a single system to use several modes concurrently.

Specify a mode using "hanetconfig create" command with -m option.