Upgrading a Sensor from 3.1 to 4.0
Upgrading your IDS sensor to version 4.0
from 3.1 is very similar to re-imaging the sensor using the Cisco IDS 4.0(1)
Upgrade/Recovery CD. There are a few considerations before upgrading that need
to be addressed. If your IDS sensor is model IDS-4235 or IDS-4250, you must
upgrade the BIOS before you can install version 4.0 on either platform. The
other consideration is that if your IDS sensors are models IDS-4220-E or
IDS-4230-FE, you must swap the interface cables on the two ports. The PCI card
that is normally used for sniffing on the IDS-4220-E and the IDS-4230-FE does
not support monitoring of dot1q trunk packets or the
tracking of alarm 993, Dropped Packet. The performance of
the PCI card is also lower than the integrated NIC. If you do not swap the
cables on the IDS-4220-E or IDS-4230-FE, there is a chance you will not be able
to connect to your appliance over the network.
Prior to upgrading, make sure you record the configuration
information before reinitializing the sensor using the run
Diagnostics command.
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