Table 1.1 Function comparison (1) and Table 1.2 Function comparison (2) compare the functions of each network switching mode.
Redundant line switching method | Fast switching mode | NIC switching mode | ||
---|---|---|---|---|
Network control | Makes both of redundant transmission routes active and uses them concurrently. A stream of data is sent on a TCP connection. | Activates and uses one redundant transmission route exclusively and deactivates the other route. | ||
Fault monitoring | Detectable failures | NIC, cable, switch/HUB, remote host | NIC, cable, switch/HUB | |
Fault monitoring | Monitoring method | Monitors framework between the NIC of the host and that of the remote host. If the frame communication is disrupted, a transmission route failure will be detected. | Monitors switch/HUB using the ping command. If the switch/HUB communication is disrupted, a transmission route failure will be detected. | |
Failure detection time | 5 to 10 seconds (Default) | 22 to 27 seconds (Default, when a failure is detected by ping). | ||
Recovery monitoring | Monitoring recovery method | Monitors framework between the NIC of the host and that of the remote host. If the frame communication is disrupted, a transmission route failure will be detected. | If a monitoring framework is sent from a standby NIC to an operating NIC, and the standby NIC receives a reply from the operating NIC within a specified time, transmission route recovery will be detected. | |
Recovery detection time | 1 to 5 seconds (Default) | About 1 to 30 seconds (Default) | ||
Fault monitoring | Automatically starts along with virtual interface activation and stops along with its deactivation. | Automatically starts along with virtual interface activation and stops along with its deactivation. | ||
Line switching | Switchover | Automatically disconnects a failed transmission route and uses the other transmission route. | Automatically deactivates NIC of a failed transmission route and activates a standby NIC. | |
Switchback | If a failed transmission route is recovered, it will automatically rejoin an ongoing operation. | If a failed transmission route is recovered, it will automatically rejoin operation as a standby NIC. | ||
Conditions | Remote hosts | PRIMEQUEST, PRIMERGY, PRIMEPOWER, GP7000F, GP-S, Fujitsu S series | Arbitrary host | |
IP address | IPv4 address, IPv6 address | IPv4 address, IPv6 address |
Redundant line switching method | Virtual NIC mode | GS linkage mode | ||
---|---|---|---|---|
Network control | Activates and uses one redundant transmission route exclusively and deactivates the other route. | Makes both of redundant transmission routes active and uses them concurrently. A stream of data is sent on a TCP connection. | ||
Fault monitoring | Detectable failures | NIC, cable, switch/HUB | NIC, cable, HUB, router, remote host (system failure, etc) | |
Fault monitoring | Monitoring method | Link status monitoring: Network monitoring: | Monitors a remote host using the ping command. If the communication is disrupted, a transmission route failure will be detected. | |
Failure detection time | Link status monitoring: Network monitoring function: | 25 to 30 seconds. (Default) | ||
Recovery monitoring | Recovery monitoring method | If a monitoring framework is sent from a standby NIC to an operating NIC, and the standby NIC receives a reply from the operating NIC, transmission route recovery will be detected. | Monitors a remote host using the ping command. If the system receives a reply from the remote host within a specified time, transmission route recovery will be detected. | |
Detectable recovery time | 3 to 5 seconds. (Default) | About 1 to 5 seconds. (Default) | ||
Fault monitoring | Automatically starts along with virtual interface activation and stops along with its deactivation. | Automatically starts along with virtual interface activation and stops along with its deactivation. Manual startup or stop of fault monitoring is also allowed with the operational command. | ||
Line switching | Switchover | Automatically deactivates NIC of a failed transmission route and activates a standby NIC. | Automatically disconnects a failed transmission route and uses the other transmission route. | |
Switchback | If a failed transmission route is recovered, it will automatically rejoin operation as a standby NIC. | If a failed transmission route is recovered, it will automatically join communication. | ||
Conditions | Remote hosts | Arbitrary host | GS (Global Server), PRIMEQUEST, PRIMERGY | |
IP addresses | IPv4 address, IPv6 address | IPv4 address |