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Imagine the two devices, one connected to one Sensor port and the other
connected to the other Sensor port, are instead connected directly together. Would
you use a straight-through cable or a cross-over cable?
If the two devices would be connected with a straight-through cable, then use one
straight-through cable and one cross-over cable to connect the Sensor to these
devices. When NIC Bypass kicks in, this will have the result of creating one, long
straight-through cable connecting the devices.
If the two devices would be connected with a cross-over cable, then use two
straight-through cables to connect the Sensor to these two devices. When NIC
Bypass kicks in, this will have the result of creating one, long cross-over cable
connecting the devices.
Peer Port Modulation (PPM)
When Peer Port Modulation is enabled, if any of the interfaces in a virtual router
become unavailable, the Sensor deactivates all the interfaces in that virtual router.
All devices connected to the virtual router will detect a port failure and must be
configured to take appropriate action.
You cannot enable NIC Bypass and Peer Port Modulation on the same Sensor.
PPM works somewhat differently on the IDP 50, 200, 600, and 1100 than it did on
the IDP 10, 100, 500, and 1000.
On the older IDP Sensors (10, 100, 500, 1000):
On the newer IDP Sensors (50, 200, 600, 1100):
Management Interfaces
These interfaces are provided on all IDP Sensors.
Serial Console (CONSOLE)
The Console port provides access, via a DB-9 serial port, to the Sensor's command
line interface (CLI).
PPM does not work on fiber interfaces
PPM works by changing the interface speed/duplex settings to 10
mbps/half-duplex, not by turning off the interfaces. Because of this, interface
speeds have to be hardcoded (could not be auto) on both the Sensor and on the
attached switches.
PPM works on both copper and fiber interfaces
PPM works by turning off appropriate interfaces. Because of this, interface
speeds can be set to auto on the Sensor and on attached switches.
Chapter 1: Hardware Overview
Sensor Components
5
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