3Com 4210G Series, Configuration Manual, Page: 49 / 1133

1-10
To do… Use the command… Remarks
Configure the MDI mode for
the Ethernet interface
mdi
{
across
|
auto
|
normal
}
Optional
Defaults to
auto
. That is, the
Ethernet interface determines
the physical pin roles (transmit
or receive) through negotiation.
Testing the Cable on an Ethernet Interface
z
10-Gigabit Ethernet ports and optical interfaces of SFP ports do not support this feature.
z
A link in the up state goes down and then up automatically if you perform the operation described
in this section on one of the Ethernet interfaces forming the link.
Follow these steps to test the current operating state of the cable connected to an Ethernet interface:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter Ethernet interface view
interface interface-type
interface-number
—
Test the cable connected to the
Ethernet interface once
virtual-cable-test
Required
Configuring the Storm Constrain Function on an Ethernet Interface
The storm constrain function suppresses packet storms in an Ethernet. With this function enabled on
an interface, the system detects the multicast traffic, or broadcast traffic passing through the interface
periodically and takes corresponding actions (that is, blocking or shutting down the interface and
sending trap messages and logs) when the traffic detected exceeds the threshold.
Alternatively, you can configure the storm suppression function to control a specific type of traffic. As
the function and the storm constrain function are mutually exclusive, do not enable them at the same
time on an Ethernet interface. For example, with broadcast storm suppression ratio set on an Ethernet
interface, do not enable the storm constrain function for broadcast traffic on the interface. Refer to
Configuring Storm Suppression for information about the storm suppression function.
With the storm constrain function enabled on an Ethernet interface, you can specify the system to act
as follows when the traffic detected exceeds the threshold.