IBM 1G, Руководство пользователя

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Switching mode Description
Bypass Bypass mode channels Ethernet frames from the public
network to port N1 (network in). Data is routed through
a closed loop from port N1 (network in) to port N2
(network out) and bypasses the Network IPS appliance
so that frames go directly from the public network to the
private network.
Bypass mode also operates in reverse, routing data from
a private network to a public network.
Heartbeat modes
The Network Active Bypass unit can continually monitor the health of Network IPS appliances by
sending and receiving heartbeat pulses. This ensures real-time safety and accuracy of the data stream.
You use a set time defined in the Timeout value (see “Command line parameters” on page 23 for timeout
values) to configure heartbeat frames that are sent from the Network Active Bypass unit on one appliance
port and received on the other port.
Network Active Bypass unit provides the following heartbeat modes :
Heartbeat mode Description
Internal Heartbeat Frame Loopback Mode A user-defined Ethernet heartbeat frame that is generated
by the Network Active Bypass unit. and sent from port
A1.The Network Active Bypass unit Ethernet port A2
must receive the same heartbeat frame from the Network
IPS appliance.
Note:
The heartbeat is sent every 100 milliseconds (ms)
by default and can be increased up to 25500 ms.
This mode is designed for Network IPS appliances that
act as a bridge. Make sure appliances are properly
configured so that the device does not filter out the
heartbeat frame. This mode does not require a driver for
Network IPS appliances.
Default: 1
Link Status Heartbeat Mode The heartbeat signal acts as a link status indicator for
Network Active Bypass unit Ethernet port A1 and A2. If
port A1 or port A2 loses the link, theNetwork Active
Bypass unit stops the heartbeat transmissions and
activates bypass mode.
Chapter 1. Introducing the Network Active Bypass unit
5