IBM 8237, Installation And User Manual

Page: 70 / 166

Chapter 3. 8237 Administration
3-29
Mode
This is a selection field. The possible values are MANUAL and AUTO.
Selecting AUTO causes the authorized address for the port to be
automatically learned. Selecting MANUAL requires the authorized
address for the port to be manually entered. Note that if an address is
manually entered this field will change to MANUAL even if it were
configured as AUTO.
Authorized Address
This field enables you to enter the MAC address of the device that is
authorized to communicate with this port. Note that this address is used
for intrusion prevention.
Intrusion Action
This is a selection field where you can choose the action to be taken
when an unauthorized MAC address attempts to communicate with the
port. Possible values are INACTIVE, NOTIFY, and NOTIFY AND
DISABLE.
Notifications are issued in the form of trap messages. If the port is set to
DISABLE following receipt of an unauthorized communication, it must be
re-enabled from the Admin Status field of the Port Configuration panel
(see Figure 3-15 on page 3-20).
Eavesdrop
This is a selection field. The two possible values are INACTIVE and
ACTIVE. Eavesdropping protection ensures that only designated
workstations will receive confidential data packets from the network. If a
port has Eavesdrop set to ACTIVE, a check is performed on incoming
packets to see if the destination address matches the last source address
for that port. If a match is made the packet is repeated to the port
unchanged; otherwise, it is repeated with scrambled data (a pattern of
alternating ones and zeroes). Broadcast packets are always repeated on
all ports unchanged.
Last Source Address
This field displays the source address of the last incoming frame on the
port.