3Com 3CNJ220-CRM, Руководство пользователя

Страница: 58 / 82

54 C
HAPTER
4: U
SING THE
C
ENTRAL
C
ONFIGURATION
M
ANAGER
You can change the Alert Level if you want to be notified of specific events
happening with the IntelliJack. Each level above 0 provides different types of event
alerts as described below:
Port Based Controls
35 For the next three settings, first select the port you want to configure.
36 You can turn on Flow Control for a specific port. Setting Flow Control to Off (the
default setting) allows full passage of traffic regardless of how quickly it is
processed by the IntelliJack.
You may want to turn Flow Control On if you discover that large amounts of
traffic are being sent to the IntelliJack and it is dropping Ethernet packets. The
Flow Control sends a message to the upstream switch the IntelliJack is connected
to, telling it to slow down the rate at which it forwards traffic. This will slow down
the network.
37 The IntelliJack has the ability to configure AutoMDI[X]. Manual MDI configuration
(the default value) assumes that the patch cords between the IntelliJack’s PAN
port and the device it’s plugged into are straight-through cables (not cross-over
cables).
If you use cross-over cables to connect devices to your network, you would need
to set this option to Manual MDIX Configuration so that network traffic can pass
between the device and the PAN port of the IntelliJack.
38 You may want change the Data Rate Control options. The default settings allow
all types of traffic to pass through the IntelliJack at full bandwidth.
You can change the frame limitations to slow down or block particular types of
traffic. For example, you may want to allow unicast traffic to pass at full
bandwidth but restrict broadcast traffic because you are concerned about a type
of virus that triggers broadcast storms. With the Data Rate Control, you can
configure the IntelliJack to only allow unicast traffic to pass.
Alert Level Notifying Event
Level 0: Disable all alert messages None
Level 1: Allow critical alerts Device Power Failure/Reboot
Abnormal Reboot
IP Address Change
Level 2: Allow standard alerts Device Power Failure/Reboot
Abnormal Reboot
IP Address Change
Unauthorized Access
Level 3: Allow all alerts Device Power Failure/Reboot
Abnormal Reboot
IP Address Change
Unauthorized Access
Normal Reboot
NBX phone plugged in
NBX phone removed