Hitachi Compute Blade 500 Series Function Manual page 21

Lan advanced function manual (for intel)

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Adapter Fault Tolerance

The AFT function provides the fault tolerance for LAN devices between the system

equipment and the network. The function makes one team with using two LAN

devices, one for active connection (Primary LAN device) and the other for backup

(Secondary LAN device).

The AFT function transmits and receives a probing packet (Broadcast Packet

compliant with the Intel® proprietary specification) as heartbeat between Primary

LAN device and Secondary LAN device. The AFT function monitors the link state

between the Primary LAN device and the switching HUB for active connection and the

transmission and reception state of the probing packet between LAN devices. Even if

the link for the Primary LAN device is disconnected to disable transmission or receive

of the probing packet, the AFT function failover all the traffic (including the MAC

address and the IP address) to the link for the Secondary.

Probing packet is enabled by default for the use of the AFT function. If it is

impossible to normally transmit or receive Probing packet in heavy traffic

network, it might repeat to failover and failback between Primary LAN device and

Secondary LAN device. In such a case, disable the probing packet. See "How to

Disable Monitoring Packet (AFT/ALB)".

When using the AFT function, connect the two LAN devices to the same switching

HUB.

When the AFT function is used, LAN device priorities (Primary and Secondary)

are not defined by default. See How to set LAN device priorities, for details.

Hitachi Compute Blade 500 Series LAN Advanced Function Manual (for Intel)

Primary LAN device

Secondary LAN device

LAN Advanced Functions

2-3

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