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IDP 75, 250, 800, and 8200 Installation Guide
12 Traffic Ports (Forwarding Interfaces)
The fiber Ethernet ports are standard interfaces and do not incorporate the
integrated bypass feature. Automatic bypass is available for fiber ports through
third-party devices.
NIC Bypass and Cable Choices
When NIC bypass becomes active, it physically connects the pair of forwarding
interfaces to each other with a crossover cable.
If you are connecting devices that support auto-MDIX (medium dependent interface
crossover) to automatically switch to the proper configuration after a cable is
connected, and then you can use whatever cables you want, because auto-MDIX
negotiates the correct connection. However, if neither of the devices supports
auto-MDIX, and then you need to take special care to choose the right cables.
Suppose two devices, one connected to one sensor port and the other connected to
the other sensor port, are instead connected directly together.
If the two devices are connected with a straight-through cable, use one
straight-through cable and one crossover cable to connect the sensor to these
devices. When NIC bypass starts, the resulting effect is to create one, long
straight-through cable connecting the devices.
If the two devices are connected with a cross-over cable, use two
straight-through cables to connect the sensor to these two devices. When NIC
bypass starts, the resulting effect is to create one, long straight-through cable
connecting the devices.
External Bypass Unit State
This state is only available when the sensor is in transparent mode. It behaves the
same as normal state, except that NSRP packets are passed even if Layer 2 bypass
is not enabled.
The external bypass unit state appears only in the after system unavailability list
of the ACM. However, selecting it there enables it globally for all states.
NICs Off State
During sensor operation, this state behaves the same as normal state. NSRP
heartbeats are not passed unless the sensor is in transparent mode and Layer 2
bypass is enabled. The difference is this: when the sensor software becomes
unavailable because of graceful shutdown or unexpected failure, the NICs turn off
and no longer appear live to other devices on the network.
This setting is not global. It must be selected for each interface pair and in each
mode (after system unavailability and after graceful shutdown).
NOTE: The External Bypass Unit setting is global. Selecting it for any interface
pair enables it for all interface pairs on the sensor. If enabled for one interface
pair, all interface pairs pass NSRP packets regardless of their individual settings.