Testing The Cable On An Ethernet Port; Configuring The Storm Constrain Function On An Ethernet Port - 3Com 4500G Family Configuration Manual

3 and pin 6 are used for transmitting signals. To enable normal communication, you should connect the
local transmit pins to the remote receive pins. Therefore, you should configure the MDI mode
depending on the cable types.
Normally, the auto mode is recommended. The other two modes are useful only when the device
cannot determine the cable type.
When straight-through cables are used, the local MDI mode must be different from the remote MDI
mode.
When crossover cables are used, the local MDI mode must be the same as the remote MDI mode,
or the MDI mode of at least one end must be set to auto.
Follow these steps to configure the MDI mode for an Ethernet port:
To do...
Enter system view
Enter Ethernet port view
Configure the MDI mode for the
Ethernet port

Testing the Cable on an Ethernet Port

10-Gigabit Ethernet ports and optical ports of SFP ports do not support this feature.
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 ports forming the link.
Follow these steps to test the current operating state of the cable connected to an Ethernet port:
To do...
Enter system view
Enter Ethernet port view
Test the cable connected to the
Ethernet port once

Configuring the Storm Constrain Function on an Ethernet Port

The storm constrain function suppresses packet storms in an Ethernet. With this function enabled on a
port, the system detects the multicast traffic, or broadcast traffic passing through the port periodically
Use the command...
system-view
interface interface-type
interface-number
mdi { across | auto | normal }
Use the command...
system-view
interface interface-type
interface-number
virtual-cable-test
1-9
Remarks
—
—
Optional
Defaults to auto. That is, the
Ethernet port determines the
physical pin roles (transmit or
receive) through negotiation.
Remarks
—
—
Required